Re: [Qgis-user] How to connect qfield to GPS RTK

[Bernd Vogelgesang via QGIS-User]

Hi,

I am not very experienced in this field either, but get my RTK running 
most of the time. I use a RTK GNNS from Ardusimple, connected to the 
Android device by bluetooth. What kind of RTK  do you try use?


I use 
https://play.google.com/store/apps/details?id=com.lefebure.ntripclient=en_US=1 
as the ntrip client app to handle the ntrip caster connection.


In Android, you have to enable the mock location in the developer 
settings and set the lefebure ntrip caster as source for the positioning 
data to bypass your internal GPS.


When everything is correctly configured in the ntrip client app, QField 
picks up the RTK positioning automatically.


This is what works for me but I have no further knowledge about other 
types of devices and connection possibilities so far.


Cheers,
Bernd
Am 17.04.24 um 18:30 schrieb david cebrian via QGIS-User:

Hello everyone,

I have read the qfield documentation but I still don't know how to 
connect my RTK to qfield in order to do a topographic survey. I am using 
android and the latest version of qfield.


 1.
Someone knows how to connect to ntrip caster? And 2) do I need
another app on my phone in order to do so? Any other relevant
information is most welcome.


Many thanks for the attention to this matter.

Best wishes,

David

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Re: [Qgis-user] Cross layer filtering

[Bernd Vogelgesang via QGIS-User]

Hi,

idea #1: Do not create a virtual layer (tried this way for years and its 
still somehow a nightmare), but just duplicate you layer and switch it 
to rule based rendering with a CASE WHEN clause for the selected property.


idea #2: I do not know what you exactly mean with "bring in an 
associated layer" and how much of it you have to bring in, but maybe 
aggregate functions in other virtual fields will do the job?


I just recently dived into the aggregate stuff, and there are not too 
many good examples around. I find it pretty stable and did not encounter 
any crashes like with virtual layers (it just works or not). Might take 
a while for calculations (but that is just a question of hardware 
upgrades ;) )
When this is just for layout purposes in the composer, rendering time 
should not be as significant as well.


#3: Use themes!

When running into troubles, just ping me.

Cheers,
Bernd

p.s. maybe just bad ideas, but this just popped into my mind after my 
third beer


Am 28.03.24 um 14:39 schrieb Paul Wittle via QGIS-User:

Hi,

I’ve been filtering a layer by adding a virtual column populated with 
is_selected() and then creating a virtual layer from it using the filter:


WHERE virtualField = 1

This is working well and allows you to have a copy of the layer that 
only shows the selected records when you are creating a layout.


I now need to bring in an associated layer, but I can’t find a reliable 
way to cross layer filter because QGIS just hangs for ages and crashes.


I’ve searched around and can see a lot of people talk about making the 
database do the work but of course it can’t if you are trying to use a 
selection filter.


What is the most reliable way of setting up a filter based on a join 
because QGIS tells me that I must use a virtual layer and even creates 
it for me; but then it just hangs and crashes.


Is there a better way?

Info required to replicate:

  * Create a layer (mine is from Oracle DB) and add a virtual field
called “SelectedRow” with the formula “to_int(is_selected())”
  * Bring in a second layer that has a one-to-many relationship based on
an attribute
  * I’m trying to filter the second layer based on the first one where
the second layer must only include rows that match a selected key. 


Thank in advance for any tips,

Paul

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Re: [Qgis-user] QGIS through conda on Linux

[Bernd Vogelgesang via QGIS-User]

Hi Hannes,

ocl-icd-system  indeed did the trick :)

Will now investigate the other traps that my lie around.

See you then ;)

Bernd
Am 26.02.24 um 17:21 schrieb Johannes Kröger (WhereGroup):
I haven't tested OpenCL in a conda QGIS myself but assumed that the 
instructions would work (have working OpenCL on the host, then install 
the ocl-icd-system in the conda environment where you want to use it).


A quick test on a AMD Ryzen laptop just failed but even non-conda QGIS 
did not pick up OpenCL support on it. :\


I hope this isn't a dead end. Sorry for not keeping your goal with 
OpenCL support in mind when suggesting this initially!


On 26.02.24 15:32, Bernd Vogelgesang wrote:

S,

I thought to share my steps so far, so I will not have to ask again in 
some weeks ;)


terminal:
$ curl -L -O 
"https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-$(uname)-$(uname -m).sh"

bash Miniforge3-$(uname)-$(uname -m).sh

was asked to deactivate the base environment and confirmed, but 
somehow this did not happen, so:


$ conda config --set auto_activate_base false

$ conda create --name qgis_3.34

then I got warned that there is a newer version of conda (strange, why 
isn't the new version installed right away?).

So done as told:

$ conda update -n base -c conda-forge conda

$ conda activate qgis_3.34

conda install qgis=3.34

stuff is installed, but again the warning to update

finally:
WARNING: No ICDs were found. Either,
- Install a conda package providing a OpenCL implementation (pocl, 
oclgrind, intel-compute-runtime, beignet) or
- Make your system-wide implementation visible by installing 
ocl-icd-system conda package.


That stuff is exactly what I was messing around with for the past week 
to get the graphics card support in QGIS. Gnrrr...!


So, what to do now? I feel like panicking ... ;)





Am 26.02.24 um 14:21 schrieb Johannes Kröger (WhereGroup):
Don't feel dumb, it is all written and spread out in super 
complicated ways but once running, it's alright-ish.


Normal Miniforge3 should be fine unless you know you want pypy.
Unless you know differently, try the "Miniforge3-Linux-x86_64" version.
Mamba is something hidden in the background, for you it will pretend 
to be Conda. Conda is the original project, mamba is a faster, 
compatible alternative.
Miniforge is something that comes with mamba "as conda" and 
automatically uses the big "conda-forge" repository where lots of 
software and libraries are available, packaged by the community.


You can use the command lines from 
https://github.com/conda-forge/miniforge?tab=readme-ov-file#install


After installation I recommend: $ conda config --set 
auto_activate_base false
Otherwise every terminal/shell session will run using a conda 
environment instead of your standard system environment.


Once installed, you can use the "create" line from other previous 
mail to install a QGIS environment. Then "conda activate qgis_3.34" 
to activate it in a terminal session, "qgis" in that same terminal to 
launch that QGIS and just close the terminal or enter "conda 
deactivate" to deactivate it again.


Cheers, Hannes


On 26.02.24 13:41, Bernd Vogelgesang wrote:

Hi Hannes,

Thanks for you answer. I played around before with those snakes and 
that's what maybe brought me into trouble.


And again, this zoo of species starts to confuse me, starting with 
the installer:

Miniforge3 or Miniforge-pypy3 ?
And when does the mamba come into play instead of the conda?

Sorry for me playing the dumb, but I almost spent a week trying to 
get things back to normal here at my desk.


Cheers,
Bernd

Am 26.02.24 um 12:35 schrieb Johannes Kröger (WhereGroup):

Hi Bernd,

a pragmatic solution which I have grown to like is using conda 
environments. Using mamba instead of the default conda via 
https://github.com/conda-forge/miniforge to reduce annoyances and 
then it is for example a simple "conda --create qgis_3.34 
qgis=3.34" to get a nicely isolated QGIS 3.34 with pdal etc.


Just make sure to deactivate the base environment in your 
terminal/shell, otherwise you are trading one potential mess for 
another ;)


Cheers, Hannes

On 26.02.24 12:10, Bernd Vogelgesang via QGIS-User wrote:

Hi,
using QGIS on the "normal" ubuntu-based Linux Mint for years, I 
again managed to render my system unusable by playing around too 
much, resulting in ever crashing QGIS so I even had to reactivate 
a Windows Virtual Box to be able to work!!


After a hell of problems with NVIDIA graphics drivers (opencl 
support in QGIS), I finally managed to get everything to work with 
Linux Mint Debian edition ... but now had to learn that Debian 
does not provide PDAL for point cloud stuff in the repositories.


Long story short: Can anyone give me recommendations how to get 
PDAL working with QGIS that do NOT include building PDAL and QGIS 
by myself?

Though I USE Linu

Re: [Qgis-user] QGIS through conda on Linux

[Bernd Vogelgesang via QGIS-User]

S,

I thought to share my steps so far, so I will not have to ask again in 
some weeks ;)


terminal:
$ curl -L -O 
"https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-$(uname)-$(uname 
-m).sh"

bash Miniforge3-$(uname)-$(uname -m).sh

was asked to deactivate the base environment and confirmed, but somehow 
this did not happen, so:


$ conda config --set auto_activate_base false

$ conda create --name qgis_3.34

then I got warned that there is a newer version of conda (strange, why 
isn't the new version installed right away?).

So done as told:

$ conda update -n base -c conda-forge conda

$ conda activate qgis_3.34

conda install qgis=3.34

stuff is installed, but again the warning to update

finally:
WARNING: No ICDs were found. Either, 

- Install a conda package providing a OpenCL implementation (pocl, 
oclgrind, intel-compute-runtime, beignet) or 

- Make your system-wide implementation visible by installing 
ocl-icd-system conda package.


That stuff is exactly what I was messing around with for the past week 
to get the graphics card support in QGIS. Gnrrr...!


So, what to do now? I feel like panicking ... ;)





Am 26.02.24 um 14:21 schrieb Johannes Kröger (WhereGroup):
Don't feel dumb, it is all written and spread out in super complicated 
ways but once running, it's alright-ish.


Normal Miniforge3 should be fine unless you know you want pypy.
Unless you know differently, try the "Miniforge3-Linux-x86_64" version.
Mamba is something hidden in the background, for you it will pretend to 
be Conda. Conda is the original project, mamba is a faster, compatible 
alternative.
Miniforge is something that comes with mamba "as conda" and 
automatically uses the big "conda-forge" repository where lots of 
software and libraries are available, packaged by the community.


You can use the command lines from 
https://github.com/conda-forge/miniforge?tab=readme-ov-file#install


After installation I recommend: $ conda config --set auto_activate_base 
false
Otherwise every terminal/shell session will run using a conda 
environment instead of your standard system environment.


Once installed, you can use the "create" line from other previous mail 
to install a QGIS environment. Then "conda activate qgis_3.34" to 
activate it in a terminal session, "qgis" in that same terminal to 
launch that QGIS and just close the terminal or enter "conda deactivate" 
to deactivate it again.


Cheers, Hannes


On 26.02.24 13:41, Bernd Vogelgesang wrote:

Hi Hannes,

Thanks for you answer. I played around before with those snakes and 
that's what maybe brought me into trouble.


And again, this zoo of species starts to confuse me, starting with the 
installer:

Miniforge3 or Miniforge-pypy3 ?
And when does the mamba come into play instead of the conda?

Sorry for me playing the dumb, but I almost spent a week trying to get 
things back to normal here at my desk.


Cheers,
Bernd

Am 26.02.24 um 12:35 schrieb Johannes Kröger (WhereGroup):

Hi Bernd,

a pragmatic solution which I have grown to like is using conda 
environments. Using mamba instead of the default conda via 
https://github.com/conda-forge/miniforge to reduce annoyances and 
then it is for example a simple "conda --create qgis_3.34 qgis=3.34" 
to get a nicely isolated QGIS 3.34 with pdal etc.


Just make sure to deactivate the base environment in your 
terminal/shell, otherwise you are trading one potential mess for 
another ;)


Cheers, Hannes

On 26.02.24 12:10, Bernd Vogelgesang via QGIS-User wrote:

Hi,
using QGIS on the "normal" ubuntu-based Linux Mint for years, I 
again managed to render my system unusable by playing around too 
much, resulting in ever crashing QGIS so I even had to reactivate a 
Windows Virtual Box to be able to work!!


After a hell of problems with NVIDIA graphics drivers (opencl 
support in QGIS), I finally managed to get everything to work with 
Linux Mint Debian edition ... but now had to learn that Debian does 
not provide PDAL for point cloud stuff in the repositories.


Long story short: Can anyone give me recommendations how to get PDAL 
working with QGIS that do NOT include building PDAL and QGIS by myself?

Though I USE Linux for over 15 years,I would prefer avoiding that.
Fumbling around with too less insight on what I am actually doing 
just led me here...


Cheers,
Bernd





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Dipl.-Geogr.
Bernd Vogelgesang
Kappel 17
91355 Hiltpoltstein
Tel: 09192-3499427
mobil: 0163-1860160
m...@berndvogelgesang.deBEGIN:VCARD
VERSION:4.0
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EMAIL;PREF=1:m...@berndvogelgesang.de
TEL;TYPE=cell;VALUE=TEXT:+

Re: [Qgis-user] QGIS through conda on Linux (was: PDAL on LMDE (Debian) for noobs?)

[Bernd Vogelgesang via QGIS-User]

Hi Hannes,

Thanks for you answer. I played around before with those snakes and 
that's what maybe brought me into trouble.


And again, this zoo of species starts to confuse me, starting with the 
installer:

Miniforge3 or Miniforge-pypy3 ?
And when does the mamba come into play instead of the conda?

Sorry for me playing the dumb, but I almost spent a week trying to get 
things back to normal here at my desk.


Cheers,
Bernd

Am 26.02.24 um 12:35 schrieb Johannes Kröger (WhereGroup):

Hi Bernd,

a pragmatic solution which I have grown to like is using conda 
environments. Using mamba instead of the default conda via 
https://github.com/conda-forge/miniforge to reduce annoyances and then 
it is for example a simple "conda --create qgis_3.34 qgis=3.34" to get a 
nicely isolated QGIS 3.34 with pdal etc.


Just make sure to deactivate the base environment in your 
terminal/shell, otherwise you are trading one potential mess for another ;)


Cheers, Hannes

On 26.02.24 12:10, Bernd Vogelgesang via QGIS-User wrote:

Hi,
using QGIS on the "normal" ubuntu-based Linux Mint for years, I again 
managed to render my system unusable by playing around too much, 
resulting in ever crashing QGIS so I even had to reactivate a Windows 
Virtual Box to be able to work!!


After a hell of problems with NVIDIA graphics drivers (opencl support 
in QGIS), I finally managed to get everything to work with Linux Mint 
Debian edition ... but now had to learn that Debian does not provide 
PDAL for point cloud stuff in the repositories.


Long story short: Can anyone give me recommendations how to get PDAL 
working with QGIS that do NOT include building PDAL and QGIS by myself?

Though I USE Linux for over 15 years,I would prefer avoiding that.
Fumbling around with too less insight on what I am actually doing just 
led me here...


Cheers,
Bernd





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--
Dipl.-Geogr.
Bernd Vogelgesang
Kappel 17
91355 Hiltpoltstein
Tel: 09192-3499427
mobil: 0163-1860160
m...@berndvogelgesang.deBEGIN:VCARD
VERSION:4.0
N:Vogelgesang;Bernd;;;
FN:Dipl-Geogr. Bernd Vogelgesang
EMAIL;PREF=1:m...@berndvogelgesang.de
TEL;TYPE=cell;VALUE=TEXT:+491631860160
TEL;TYPE=work;VALUE=TEXT:+4991923499427
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[Qgis-user] PDAL on LMDE (Debian) for noobs?

[Bernd Vogelgesang via QGIS-User]

Hi,
using QGIS on the "normal" ubuntu-based Linux Mint for years, I again 
managed to render my system unusable by playing around too much, 
resulting in ever crashing QGIS so I even had to reactivate a Windows 
Virtual Box to be able to work!!


After a hell of problems with NVIDIA graphics drivers (opencl support in 
QGIS), I finally managed to get everything to work with Linux Mint 
Debian edition ... but now had to learn that Debian does not provide 
PDAL for point cloud stuff in the repositories.


Long story short: Can anyone give me recommendations how to get PDAL 
working with QGIS that do NOT include building PDAL and QGIS by myself?

Though I USE Linux for over 15 years,I would prefer avoiding that.
Fumbling around with too less insight on what I am actually doing just 
led me here...


Cheers,
Bernd




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VERSION:4.0
N:Vogelgesang;Bernd;;;
FN:Dipl-Geogr. Bernd Vogelgesang
EMAIL;PREF=1:m...@berndvogelgesang.de
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Re: [Qgis-user] Re: .csv table

[Bernd Vogelgesang via QGIS-User]

yepp, german speaking.

in case of of need, drop a line to mail at berndvogelgesang.de so I get
notified.

Cheers,
Bernd

Am 27.05.23 um 13:03 schrieb Burt Grabowski:

Hi Bernd,

are you german speaking
coincidentally? Maybe in some hours I will need some help, but I am
trying to make some clear .csv files.

Burt
--
Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail
gesendet.
Am 26.05.23, 21:46 schrieb Bernd Vogelgesang via QGIS-User
:

Hi Burt,

I can give it a try tomorrow.

Cheers,
Bernd

Am 26.05.23 um 16:07 schrieb Burt Grabowski via QGIS-User:
> Dear all,
>
> first of all I want to quickly introduce myself. My name is Burt
and I
> am a student of economics in Austria. I have a special request,
because
> I am an absolute beginner in QGIS, but have no time left. I am
writing
> on my diploma thesis and my supervisor wants to have some cards
in it. I
> spent a whole week, but I am not able to connect a simple .csv
file with
> the shape file. I would probably need 10 to 15 minutes, so who
would
> please have some time left for me for a zoom call, so that I can
create
> some tables for my diploma thesis? I would like to create them
over the
> weekend, because my deadline is getting closer and I cannot find
one
> description of my simple problem.
>
> Regards,
> Burt
>
> --
> Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail
> gesendet.
>
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Re: [Qgis-user] .csv table

[Bernd Vogelgesang via QGIS-User]

Hi Burt,

I can give it a try tomorrow.

Cheers,
Bernd

Am 26.05.23 um 16:07 schrieb Burt Grabowski via QGIS-User:

Dear all,

first of all I want to quickly introduce myself. My name is Burt and I
am a student of economics in Austria. I have a special request, because
I am an absolute beginner in QGIS, but have no time left. I am writing
on my diploma thesis and my supervisor wants to have some cards in it. I
spent a whole week, but I am not able to connect a simple .csv file with
the shape file. I would probably need 10 to 15 minutes, so who would
please have some time left for me for a zoom call, so that I can create
some tables for my diploma thesis? I would like to create them over the
weekend, because my deadline is getting closer and I cannot find one
description of my simple problem.

Regards,
Burt

--
Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail
gesendet.

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Re: [Qgis-user] Copying collected shape file to another shape file

[Bernd Vogelgesang via QGIS-User]

Hi,
just a wild guess (as I do not work with shape files anymore):
Did you check the properties of the target layer?
Is it a MultiPolygon-Layer or just a Polygon-Layer?

It might be possible that, when the target layer was created outside of
QGIS, that it is plain Polygon, while QGIS always creates Multipolygon
layers.
But I might be wrong

Cheers,
Bernd

Am 18.04.23 um 11:35 schrieb Riccardo via QGIS-User:

Good morning to all,


I need a hint about using Qgis, I hope someone of you could answer me.


I created an area shape file using the collect/multipart operation and
in such a way as to associate several areas to the same tabular record.


I need to copy this shape file to another shape file for a requirement
of a standard delivery.


Unfortunately, the shape file where I copy my original shape file
collected doesn't keep the collect property, and so I have a copied
shape file with every area associated to a unique record and not a a
shape file with more area associated to a unique record as the original
shape file.


How can I conserve this property during the copy between two shape files?


Many thanks!


Best Regards.


Riccardo.




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Re: [Qgis-user] QGIS and historical battle

[Bernd Vogelgesang via QGIS-User]

Hi,
I'm no archaeologist, but I know that there are quite some of them
around on this list.

First short answer: yes, of course!

First counter-question: What kind of geodata is already available to you?

Actually, I think you just need 3 data-sets:
a digital terrain model to find observation spots and valleys
a vector of rivers to find the confluences
a point vector of (historic) towns

Unfortunately you did not mention how big the possible region for this
battle is, so it is hard to guess if it makes sense to create a real
simulation model, or if places can be identified in a semi-manual way.

I think it would be useful to keep the discussion on the list, so others
can learn from the example as well.
Though this is not my business, I am always interested in such kind of
"riddles".

For a starter: There is the great Visibility Analysis Plugin of Zoran
Čučković, where you can create a Visibility Index on a terrain data-set
which I think is exactly meant to identify outlook spots in the
landscape for a given radius.

Cheers,
Bernd


Am 03.02.23 um 09:20 schrieb Lazanu Ciprian-Cătălin via QGIS-User:

Hello,
I want to start a project with a great challenge:

  * first an introduction - a battle between two armies in the medieval
period. we have a few pieces of information regarding this battle:
the number of soldiers from both armies (army A with ~ 25.000/30.000
soldiers and army B between 50.000 and 100.000 - medieval chronicles
have different numbers) and incomplete information regarding the
exact place of the battle. all we know is that it was on a river
valley and the main battle was regarding controlling a bridge at the
confluence of 2 rivers. another clue is that the battle was at a
short distance from an important city (name Town) which is located
in that river valley. Army B was marching on the river valley to
take the city Town and met army A at a short distance from the city.
The battle was around a bridge on the river. That is all we know.
(Army A won that battle).
  * what I want ... I want to see if I could locate that battle (so l
could make some archaeological investigation after that) using some
simulators ... for example: to see how long the marching formation
of army B (50.000 to 80.000/90.000 soldiers) was to see the
distribution on the field/road to city Town.
  * another clue ... we know that the commander of army A (the defender)
had a small base fortification from where he could see and command
the army and make orders. such a place is visible now on a hill from
where you could see at 15 - 20 km down the river valley. (I know
that l could use visibility analysis). On the ground, the surface is
no visible traces of that battle.

This battle is an important historical moment in the history of my
country and has an important local value.
So, is there anything in QGIS or other GIS software something to work so
l can make a simulation or something like that regarding this kind of
activity?
Thank you in advance ... and any suggestions could be sent via email in
private too.
Ciprian

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Re: [Qgis-user] Atlas QGIS en lugar de filas campo atributos

[Bernd Vogelgesang via QGIS-User]

I would like to automate the export of maps with QGIS 3.22 as an atlas
but instead of exporting by rows of a layer, for example municipalities,
I would need to export by columns, that is, I have n columns
corresponding to variables in a layer of points and I would like to get
the same map with different values for each point, n columns.

Thank you very much for the ideas in advance,

Am 13.12.22 um 13:18 schrieb Alejandro Chamizo de Castro via QGIS-User:

Hola,


me gustaría automatizar la exportación de mapas con QGIS 3.22 a modo
de atlas pero en lugar de exportar por filas de una capa, por ejemplo
municipios, necesitaría exportar por columnas, es decir, tengo n
columnas de corresponden a variables en una capa de puntos y quisiera
sacar el mismo mapa con los diferentes valores para cada punto, n
columnas.

Muchas gracias por las ideas de antemano,

--
Alejandro Chamizo de Castro
+34 653681823
Analista SIG

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Re: [Qgis-user] Opening ECW files in QGIS 3.22, Ubuntu 20

[Bernd Vogelgesang via Qgis-user]

you need gdal built with ECW support

https://trac.osgeo.org/gdal/wiki/ECW

never tried that. better try to get the rasters in a supported format or
use a Windows machine (I think with advanced install you can add ECW
support, but I have only Linux over here)


Cheers,

Bernd



Am 21.09.22 um 15:25 schrieb Rosa Lago via Qgis-user:

My operating system is Kubuntu 20.04.

Thank you

22/9/21 15:01(e)an, Rosa Lago via Qgis-user igorleak idatzi zuen:

Hello

I cannot open ECW files in QGIS 3.22. My operating system is Ubuntu
20. I have searched in the websites about it, but it seems
instructions are obsolate.

Please, could you help me with this problem give me some hints?

Thanks a lot

Rosa.


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Re: [Qgis-user] 1 Layout --> 9 Atlas

[Bernd Vogelgesang via Qgis-user]

Hi,
haven't done this in a long time and have no example project at hand, but get a 
first clue here: https://gis.stackexchange.com/a/173443 or here 
https://gis.stackexchange.com/a/339296
Hope others will fill the gaps.

Good luck



On 02.09.22 13:24, Miquel Pujol Garcia via Qgis-user 
 wrote:

*Hi QGISers,*

My question is about Atlas and Layout.

I have a file "polygons.shp" with 30 elements. Every element with ID.
I would like to do a layout sheet with 9 elements different and when
I refresh the view, and the elements change.

There's someone any idea how to do this?

Thanks,
*Miquel Pujol Garcia*


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Re: [Qgis-user] Convert huge shapefile to small size

[Bernd Vogelgesang via Qgis-user]

so, maybe you should really drop all unneccessary fields or maybe all but an id 
field, and then create a relation to the original database, but in any case I 
would convert that stuff away from ESRI-Shape to Geopackage beforehand, as is 
it is a pita.

On 28.07.22 13:52, krishna Ayyala  wrote:

dbf file itself is 5.1GB. Rest all other files are less than 500MB. It
is the number of records which is huge. It has about 117,2100 points.

On Thu, Jul 28, 2022 at 12:02 AM Bernd Vogelgesang via Qgis-user
mailto:qgis-user@lists.osgeo.org>> wrote:

how big is the dbf file of that shape? Maybe you can also drop some
attributes.

Am 28.07.22 um 03:46 schrieb krishna Ayyala via Qgis-user:
 > Hello,
 > I have a shapefile of 5GB in size. Is it possible to convert this
 > shapefile to a smaller size file? It can be any format, not
 > necessarily a shapefile. But, preferably a vector format. I tried to
 > convert it into tiles, but that didn't work as it was losing the
 > resolution. I am looking to convert this 5GB size file to about
500MB.
 >
 > Regards.
 >
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Re: [Qgis-user] Convert huge shapefile to small size

[Bernd Vogelgesang via Qgis-user]

how big is the dbf file of that shape? Maybe you can also drop some
attributes.

Am 28.07.22 um 03:46 schrieb krishna Ayyala via Qgis-user:

Hello,
I have a shapefile of 5GB in size. Is it possible to convert this
shapefile to a smaller size file? It can be any format, not
necessarily a shapefile. But, preferably a vector format. I tried to
convert it into tiles, but that didn't work as it was losing the
resolution. I am looking to convert this 5GB size file to about 500MB.

Regards.

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Re: [Qgis-user] Dimensioning in QGIS

[Bernd Vogelgesang via Qgis-user]

Hi Ian,

the only way I know of visualizing dimensions so far is by using a
special style: https://github.com/faunalia/QGIS-Resources.git

To be able to use it, you have to install the  "Resource Sharing"-plugin
and then install "Distance Measurement Styles" from there.

This is a quite clever but also a bit confusing approach, cause the
labels with the numbers are actually no labels in the common sense, but
generated as a font markers within the symbology.
You will have to play around with them to make them look as you like.
It may be good not to use thet style on your original features, but
create a separate dimensioning layer (a duplicate of your orginial layer)

Cheers,

Bernd


Am 23.06.22 um 23:33 schrieb IainS via Qgis-user:


Is there a tool for adding dimensions in QGIS. For those who are
wondering what I am talking about, it is common in CAD drafting to add
dimensions to what you have drawn and this is a whole part of a CAD
program where you can format dimensions …etc.

I have been asked to add dimensions to an archaeological hole I am
digging on a QGIS map and I was wondering whether there is a similar
dimensioning tool in QGIS.

Cheers

*Dr Iain Stuart*

*/JCIS Consultants /*

P.O. Box 2397

Burwood North

NSW, 2134

(02) 9701 0191
(0413) 380116 (m)


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Re: [Qgis-user] Adding Geometry table to QGIS

[Bernd Vogelgesang via Qgis-user]

Here is the list of vector formats that get eaten by QGIS:
https://gdal.org/drivers/vector/index.html#
I have no idea about this whole ESRI-SDE-shebang. That they detect their own 
formats is not big surprise though. So better ask ESRI about 
standard-compliance/export of data and so on.

On 01.06.22 15:02, Yamen Tekaji via Qgis-user  wrote:

Hello all,

I am trying to add a table with spatial data (geometry shape column) to
QGIS and view its polygons/points in the QGIS interface.

Unfortunately QGIS does not detect any geometry columns from the tables;
although they can be easily detected in ArcMAP. Please check the snapshots.

Is there a solution for this?
Note: the geometry information has been created by ESRI SDE

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Re: [Qgis-user] Spatial Filter

[Bernd Vogelgesang via Qgis-user]

That is "select by location" and it lives either as the yellow square
with the blue pin in the first row of icons, or search its address in
the toolbox.

Am 24.05.22 um 14:29 schrieb Yamen Tekaji via Qgis-user:

Hello all,

I need to do Spatial Filtering for my data. meaning, to select a
concession (polygon) and to ask QGIS to find all wells (points) that
exist (or does not exist) in this polygon.

is this possible? what is the tool name?

Thanks
Yamen

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Re: [Qgis-user] Questões sobre o QGIS 3.22.5

[Bernd Vogelgesang via Qgis-user]

Ah,

I first understood , that QGIS crashes with this error message.

Obviously, only the error message appears.

To get rid of the message, just deactivate the plugin

-> deepl.com ...

Am 02.04.22 um 15:59 schrieb Bernd Vogelgesang via Qgis-user:



I have installed QGIS 3.22-1, on Windows 64 bits Operating System.
The version installed is Standlone.

When I start the Program this message appears:

Python Error: Unable to load complement 'ProfileFromPoints' Due to an
error calling the Class Factory() method.

Please, how can I solve this?


https://www.deepl.com/translator#pt/en/Instalei%20o%20QGIS%203.22-1%2C%20no%20Sistema%20Operacional%20Windows%2064%20bits.%20A%20vers%C3%A3o%20instalada%20%C3%A9%20a%20Standlone.%0A%0AQuando%20inicio%20o%20Programa%20aparece%20esta%20mensagem%3A%0A%0AErro%20Python%3A%20Imposs%C3%ADvel%20carregar%20complemento%20'ProfileFromPoints'%20Devido%20a%20um%20erro%20ao%20chamar%20o%20m%C3%A9todo%20Class%20Factory().%0A%0APor%20favor%2C%20como%20fa%C3%A7o%20para%20solucionar%20isso%3F

From the message you received it indicates, that the plugin
"ProfileFromPoints" causes problems.
The easiest method to get rid of that problem, is to search for the
plugin's folder in the users directory, and to delete it.
At restart, the plugin will not be loaded, so the problem should be
solved.
The path to the folder is something like
QGIS3\profiles\default\python\plugins


Da mensagem que recebeu indica que o plugin "ProfileFromPoints" causa
problemas.
O método mais fácil para se livrar desse problema, é procurar a pasta
do plugin no directório de utilizadores, e apagá-la.
No reinício, o plugin não será carregado, pelo que o problema deve ser
resolvido.

O caminho para a pasta é algo semelhante a
QGIS3\profiles\default\python\plugins


Am 02.04.22 um 15:29 schrieb Julio Caetano Tomazoni via Qgis-user:


*Instalei o QGIS 3.22-1, no Sistema Operacional Windows 64 bits. A
versão instalada é a Standlone.*

*Quando inicio o Programa aparece esta mensagem:*

*Erro Python: *Impossível carregar complemento 'ProfileFromPoints'
Devido a um erro ao chamar o método Class Factory().

Por favor, como faço para solucionar isso?

Julio Caetano Tomazoni

Geógrafo, Especialista em Cartografia e Georreferenciamento Rural

Mestre e Doutor em geologia

Pós-Doutor em Química

Telefone 46 999756312

caet...@utfpr.edu.br


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Re: [Qgis-user] Questões sobre o QGIS 3.22.5

[Bernd Vogelgesang via Qgis-user]

I have installed QGIS 3.22-1, on Windows 64 bits Operating System. The
version installed is Standlone.

When I start the Program this message appears:

Python Error: Unable to load complement 'ProfileFromPoints' Due to an
error calling the Class Factory() method.

Please, how can I solve this?


https://www.deepl.com/translator#pt/en/Instalei%20o%20QGIS%203.22-1%2C%20no%20Sistema%20Operacional%20Windows%2064%20bits.%20A%20vers%C3%A3o%20instalada%20%C3%A9%20a%20Standlone.%0A%0AQuando%20inicio%20o%20Programa%20aparece%20esta%20mensagem%3A%0A%0AErro%20Python%3A%20Imposs%C3%ADvel%20carregar%20complemento%20'ProfileFromPoints'%20Devido%20a%20um%20erro%20ao%20chamar%20o%20m%C3%A9todo%20Class%20Factory().%0A%0APor%20favor%2C%20como%20fa%C3%A7o%20para%20solucionar%20isso%3F

From the message you received it indicates, that the plugin
"ProfileFromPoints" causes problems.
The easiest method to get rid of that problem, is to search for the
plugin's folder in the users directory, and to delete it.
At restart, the plugin will not be loaded, so the problem should be solved.
The path to the folder is something like
QGIS3\profiles\default\python\plugins


Da mensagem que recebeu indica que o plugin "ProfileFromPoints" causa
problemas.
O método mais fácil para se livrar desse problema, é procurar a pasta do
plugin no directório de utilizadores, e apagá-la.
No reinício, o plugin não será carregado, pelo que o problema deve ser
resolvido.

O caminho para a pasta é algo semelhante a
QGIS3\profiles\default\python\plugins


Am 02.04.22 um 15:29 schrieb Julio Caetano Tomazoni via Qgis-user:


*Instalei o QGIS 3.22-1, no Sistema Operacional Windows 64 bits. A
versão instalada é a Standlone.*

*Quando inicio o Programa aparece esta mensagem:*

*Erro Python: *Impossível carregar complemento 'ProfileFromPoints'
Devido a um erro ao chamar o método Class Factory().

Por favor, como faço para solucionar isso?

Julio Caetano Tomazoni

Geógrafo, Especialista em Cartografia e Georreferenciamento Rural

Mestre e Doutor em geologia

Pós-Doutor em Química

Telefone 46 999756312

caet...@utfpr.edu.br


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Re: [Qgis-user] WG: drop down Vektor not opening

[Bernd Vogelgesang via Qgis-user]

Nowadays, before reeinstalling QGIS, it is better to first check on
creating a new profile

Settings -> User Profile -> New Profile

This will give a fresh and clean "new" QGIS.

When there are problems with QGIS, it is most unlikely that the code
base is currupted. It is much more likely that plugins, settings etc.
get screwed.

Am 17.03.22 um 13:58 schrieb Lengenfelder, Michael via Qgis-user:


Dear community,

I have a problem since 2 days, the menü ‘Vektor’ doesn´t open anymore.
I reinstalles the software, but no help.

It´s 3.16.9 ‘Hannover’

thanks for help


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Re: [Qgis-user] QGIS layer styles not persisting in project

[Bernd Vogelgesang via Qgis-user]

ahh, this feature must have slipped in without noticing.

I knew only Properties-> Style -> add...  and tried this years ago. It
didn't work well by this time so I forgot about it.

Anyway, so it seems you expect, that when you switch a style for a
layer, and then add a theme, that this style will be preserved for the
layer in this theme?

p.s. better send you mails withour you logo. Answering with quoting
already exceeds the 100kb per mail.

Am 16.03.22 um 13:50 schrieb Yvan CALCAGNI:


Bernd, indeed you can have several named styles for one layer, Qgis
allows that

Right-click the layer to open the context menu --> Go toStyles-->Add



Le 16/03/2022 à 13:15, Bernd Vogelgesang via Qgis-user a écrit :

How can one multiply a style for one layer?
You can duplicate a layer multiple times and create an own style for
each and then set an indivual theme.
If thats what you do, and it doesn't work, i have no clue.

Layer styles are always saved in project files by default.
What do you mean with other format?



On 16.03.22 12:18, Yvan CALCAGNI via Qgis-user
 wrote:

Hi everyone,
in one of my project I'm setting up multiple styles for one the layers,
to make these styles matching the right project theme.

So I save the project but every times I'm re-opening it, layer styles
have disappeared.  Layer styles are never saved in project file? To
make
it work, the only solution is it to have geopackage layers (with
embedded style permitted by that format)? What if the layer is in
another format? multiple layer styles are forbidden in that case?

I'm running Qgis 3.24 standalone

Thank you guys!



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Re: [Qgis-user] QGIS layer styles not persisting in project

[Bernd Vogelgesang via Qgis-user]

How can one multiply a style for one layer?
You can duplicate a layer multiple times and create an own style for each and 
then set an indivual theme.
If thats what you do, and it doesn't work, i have no clue.

Layer styles are always saved in project files by default.
What do you mean with other format?



On 16.03.22 12:18, Yvan CALCAGNI via Qgis-user  
wrote:

Hi everyone,
in one of my project I'm setting up multiple styles for one the layers,
to make these styles matching the right project theme.

So I save the project but every times I'm re-opening it, layer styles
have disappeared.  Layer styles are never saved in project file? To make
it work, the only solution is it to have geopackage layers (with
embedded style permitted by that format)? What if the layer is in
another format? multiple layer styles are forbidden in that case?

I'm running Qgis 3.24 standalone

Thank you guys!



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Re: [Qgis-user] points to polygons conversion

[Bernd Vogelgesang via Qgis-user]

Well, yes, thats sounds like nonsense ;)

The only thing I could think of is trying to make voronoi polygons
(toolbox) on those centroids, but for sure this will not bring up any
usefull findings.




Am 16.03.22 um 11:04 schrieb Francesca Parente via Qgis-user:

Hello group,

I'd have a question I hope it doesn't sound too nonsense to you: I'm
working on a points shapefile, which I know has been created by
centroids of polygons- but I don't have access to polygonal areas.
I would need to select just those in some locations and recover their
original area within polygonal borders.

Is there a chance I can get it done by having this shapefile of
centroids only?!

Thanks a lot for your time and good day to all,
Francesca
--

Francesca Parente

_ SESS Euro PhD
 in
SocioEconomic and Statistical Studies
_ Luiss SEP  School of European Political Economy

email: francescaparente@gmail.com
paren...@luiss.it


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Re: [Qgis-user] Centra la vista in un punto

[Bernd Vogelgesang via Qgis-user]

Which plugin should I install to query the map from x and y coordinates
and get the point on the map?

https://www.deepl.com


Am 13.03.22 um 09:49 schrieb SB via Qgis-user:


Quale plugin installare per interrogare la mappa partendo dalle
coordinate x e y ed ottenere ò'indicazione del punto sulla mappa?


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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi Micha,

thank you.

And where in this theoretical situation exactly do you use drag and drop
of spreadsheets to the canvas in this process?

Bernd


Am 13.03.22 um 09:56 schrieb Micha Silver:


On 13/03/2022 10:37, Bernd Vogelgesang wrote:


Hi Micha,


can you elobrate a bit more on these situations where the data has no
column header, cause I don't know them.




Well, just a few theoretical examples:

I might have several tables of data from some sensor (i.e. rainfall,
temperature) with dates, long/lat and column headers. Merging all the
tables would cause the column headers to get repeated for each table.
I usually just remove *all* column headers, then import, and point to
the correct columns for long/lat.


When I extract values from a multiband raster at point locations (for
some ML model) I get just columns of values; the actual column names
are not important.


Hope that clarifies.



Bernd


Am 13.03.22 um 09:35 schrieb Micha Silver:



On 13/03/2022 10:22, Bernd Vogelgesang via Qgis-user wrote:


Hi Andrea,

thanx for clarifying.

imho this is not a "wise" design decision. Maybe I am too less a
pro, but i can't think of any situation when someone seriously
working with table data does NOT want to have a column header. What
would be the advantage of that?



There are situations where the data table contains only data: no
column headers.



Ok, if this is a GDAL-design decision, then at least QGIS should
have default settings in the environment preventing this.

An ordinary user will never ever expect this behaviour nor find
this setting by himself.

Cheers,

Bernd


Am 13.03.22 um 08:55 schrieb Andrea Giudiceandrea:

*Bernd Vogelgesang*
/Sat Mar 12 14:13:04 PST 2022/


So: All-string tables will not be imported correctly. Always e.g.
add an
id-field with number


Hi Bernd,
this is by design:
https://github.com/OSGeo/gdal/blob/1c5bc766513c4407f702bd8cd8bfa958ed61cfea/ogr/ogrsf_frmts/xlsx/ogrxlsxdatasource.cpp#L597-L598

Am 12.03.22 um 23:04 schrieb Jonas Küpper://

>/what should have fixed it as well would be to pass
OGR_XLSX_HEADERS = />/FORCE to the provider while loading
xlsx-files but a i couldn't find a />/way how to do that. (see
https://gdal.org/drivers/vector/xlsx.html) /


Hi Jonas,
you can set a GDAL/OGR configuration option, like
OGR_XLSX_HEADERS, via the "Settings" -> "Options" -> "System" ->
"Environment" setting panel in QGIS.

Regards.

Andrea Giudiceandrea


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--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918



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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi Micha,


can you elobrate a bit more on these situations where the data has no
column header, cause I don't know them.


Bernd


Am 13.03.22 um 09:35 schrieb Micha Silver:



On 13/03/2022 10:22, Bernd Vogelgesang via Qgis-user wrote:


Hi Andrea,

thanx for clarifying.

imho this is not a "wise" design decision. Maybe I am too less a pro,
but i can't think of any situation when someone seriously working
with table data does NOT want to have a column header. What would be
the advantage of that?



There are situations where the data table contains only data: no
column headers.



Ok, if this is a GDAL-design decision, then at least QGIS should have
default settings in the environment preventing this.

An ordinary user will never ever expect this behaviour nor find this
setting by himself.

Cheers,

Bernd


Am 13.03.22 um 08:55 schrieb Andrea Giudiceandrea:

*Bernd Vogelgesang*
/Sat Mar 12 14:13:04 PST 2022/

So: All-string tables will not be imported correctly. Always e.g. add an
id-field with number


Hi Bernd,
this is by design:
https://github.com/OSGeo/gdal/blob/1c5bc766513c4407f702bd8cd8bfa958ed61cfea/ogr/ogrsf_frmts/xlsx/ogrxlsxdatasource.cpp#L597-L598

Am 12.03.22 um 23:04 schrieb Jonas Küpper://

>/what should have fixed it as well would be to pass OGR_XLSX_HEADERS = 
/>/FORCE to the provider while loading xlsx-files but a i couldn't
find a />/way how to do that. (see https://gdal.org/drivers/vector/xlsx.html) /


Hi Jonas,
you can set a GDAL/OGR configuration option, like OGR_XLSX_HEADERS,
via the "Settings" -> "Options" -> "System" -> "Environment" setting
panel in QGIS.

Regards.

Andrea Giudiceandrea


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--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi Andrea,

thanx for clarifying.

imho this is not a "wise" design decision. Maybe I am too less a pro,
but i can't think of any situation when someone seriously working with
table data does NOT want to have a column header. What would be the
advantage of that?

Ok, if this is a GDAL-design decision, then at least QGIS should have
default settings in the environment preventing this.

An ordinary user will never ever expect this behaviour nor find this
setting by himself.

Cheers,

Bernd


Am 13.03.22 um 08:55 schrieb Andrea Giudiceandrea:

*Bernd Vogelgesang*
/Sat Mar 12 14:13:04 PST 2022/

So: All-string tables will not be imported correctly. Always e.g. add an
id-field with number


Hi Bernd,
this is by design:
https://github.com/OSGeo/gdal/blob/1c5bc766513c4407f702bd8cd8bfa958ed61cfea/ogr/ogrsf_frmts/xlsx/ogrxlsxdatasource.cpp#L597-L598

Am 12.03.22 um 23:04 schrieb Jonas Küpper://

>/what should have fixed it as well would be to pass OGR_XLSX_HEADERS = />/FORCE 
to the provider while loading xlsx-files but a i couldn't find a />/way how to do 
that. (see https://gdal.org/drivers/vector/xlsx.html) /


Hi Jonas,
you can set a GDAL/OGR configuration option, like OGR_XLSX_HEADERS,
via the "Settings" -> "Options" -> "System" -> "Environment" setting
panel in QGIS.

Regards.

Andrea Giudiceandrea
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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Caramba!

That did the trick indeed! Added a field "dummy" and some numbers in the
next rows and gave it a try: Tada! All headers there.

So: All-string tables will not be imported correctly. Always e.g. add an
id-field with number

Thanx a ton!

Bernd

Am 12.03.22 um 23:04 schrieb Jonas Küpper:


Hi Bernd,

for what its worth: I experienced these Field1, Field2 troubles
recently as well. The problem is that gdal apparently does not assume
headers in a table, if all columns are string data. What usually fixes
that for me is to add a dummy column where the first row (the header)
is a string eg. "dummy" but all the subsequent rows are numbers. i
stumbled over this behavior in the sources
https://github.com/OSGeo/gdal/blob/1a30b3fab043a918e78cac7cc035ddc2670a9ba9/ogr/ogrsf_frmts/xlsx/ogrxlsxdatasource.cpp#L575
.

what should have fixed it as well would be to pass OGR_XLSX_HEADERS =
FORCE to the provider while loading xlsx-files but a i couldn't find a
way how to do that. (see https://gdal.org/drivers/vector/xlsx.html)

Cheers

Jonas


On 11.03.2022 21:52, Bernd Vogelgesang wrote:

Hi Chris,

mhm.
There are only two columns with ordinary names.
The data holds some special characters, and first I thought this
might influence the process as well. But the version where I deleted
those entries does not behave differently.
Very strange.

Meanwhile, I exported the file to a csv, imported this one
successfully and then saved as gpkg. So at least, the data is in and
working.


Thanks,
Bernd


Am 11.03.22 um 21:38 schrieb chris hermansen:

Bernd and list,

On Fri, Mar 11, 2022, 12:08 Bernd Vogelgesang via Qgis-user
 wrote:

Hi folks,

for quite some time, I hold frequently changing data in a xlsx-file.
Working in a spreadsheet application is so much more efficient
sometimes.

This spreadsheet easily imports by drag and drop, the import
dialog pops
up where to choose which tab to import, and finally the table is
there
with the first row as column heads.

Now, I'm getting just nuts.

I'm trying to do the same with other data, and whatever I try, it
imports the table ignoring the header row, so its Field1, Field2...

Findings so far:

I had a long file name. With this, there was no import dialog,
but the
first tab was imported immediately, but without the header row.

I saved the file with a short file name, and now the import
dialog asks
which tab to import. But still, the first data-row is ignored.

Dragging my other already existing file into that project works just
perfectly.

What could be the reason for this behaviour?


Clutching at straws here...

Sometimes when making a pivot table in LibreOffice calc I notice
that column headings (first row) aren't interpreted as such.

This seems to occur on the following scenarios:

1) a column has an en empty cell in row 1 (or missing title)

2) a column exists outside the area of interest with no header (this
probably would not apply in your case, but maybe you have some
calculations to the right of your data which don't have a column header)

3) there are some "strange" characters in one or more header fields
(I can't recall precisely what constitutes "strange")


What you might want to do is save a copy of your spreadsheet, then
delete anything to the left or right of your columns, and check that
your column names are all "legal variable" names ie begin with a
letter, only letters and numbers

I hope this helps; good luck!

Chris
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Re: [Qgis-user] Automating creation of county distribution maps

[Bernd Vogelgesang via Qgis-user]

Hi Mike and list,

I took the challenge and so far succeeded at the very moment. Mike sent
me a (not so clean list) of species and counties.

My idea was to produce an atlas. (Actually, it should be made by a
report, but since those are a bit quirky still, I went the pure atlas way)

It's a bit hacky, a more straightforward way would be nice.

- cleaning the data and importing them (table species/county, county
polygons)

- create table of individual species (toolbox "Delete duplicates by
attribute") -> 101 unique species

- Setting up a relation between county layer and species/county-table on
the county name

- new text field in county layer "species" :

relation_aggregate('name_of_relation', 'concatenate', "species_names", ',')

this creates a comma-separated list of species for each county polygon

Prepare Atlas

Coverage layer: (fake coverage, as it does not move)

- create bounding box of the county-layer (Extract layer extent)

- take list of individual species and add the geometry: retrieved the
wkt of the extent in the field calculator -> "Geometry by expression":
geom_from_wkt('Polygon ((355937 4117435, 782844 4117435, 782844 4498773,
355937 4498773, 355937 4117435)')

-> 101 extents with species name as atlas coverage

- create new map layout

- Activating atlas, setting species name-field as page name

- duplication of the county-layer and setting up a rule based style:

visible: array_contains( string_to_array( "species_names",','),
@atlas_pagename)

invisible: else

this query will look for the pagename (= species name) in the array of
species names in the county polygons, and if the name is in, then the
polygon is shown in grey, alse transparent.

add text field @atlas_pagename

set atlas output filename to @atlas_pagename

Export atlas as images

DONE

Question: is there a way to aggregate the species per county without
setting up that relation beforehand? This is an extra step which would
be nice if it could be circumvented by some cool function.

Any ideas or comments?

Am 12.03.22 um 10:04 schrieb Jésahel Benoist via Qgis-user:

Hello Mike,

I tried to follow your question and the most I read the less I
understand !
Could you simply explain what you want to see, what action the user
have to do and what he gets?
For this, try to give input data and what will link them : plants
(table with plant name and states distribution?), states (geometric
data with states names?), columns to link...
The good point is that I'm sure QGIS can do this. But nobody will
engage work if objective isn't precise enough.

Regards,

J. B.


Le ven. 11 mars 2022 à 21:50, Mike Breiding - Morgantown WV via
Qgis-user  a écrit :

I had the range USA range map in the screen shot and have since
updated
it. https://photos.app.goo.gl/ktn5quT6s6SRwrzBA
WV-Mike

On 3/10/2022 11:04 AM, chris hermansen wrote:
> Perhaps others are better understanding how you want to
visualize the
> distributions, but what I get from your description is that if
you have
> 100 (or 2500) species then you will have 100 (or 2500) maps, which
> sounds unwieldy to me.

I neglected to mention the use for the distribution maps.
They will be used in a print brochure.
A page mock up can be seen here:
https://photos.app.goo.gl/ktn5quT6s6SRwrzBA

The USA distribution map in the mock up was made in Qgis using the
information from:
https://plants.usda.gov/home/plantProfile?symbol=BODI2

This is interactive and will display down to the state and county
level.
However, they are not up to date at the state/county level. If
they were
I would simply make a screen shot and that would be the end of it.

The state distribution map used in the mock up was made using Qgis
based
on data from the West Virginia University Herbarium which has the
most
up to date information on distribution.

WV-Mike



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Re: [Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi Chris,

mhm.
There are only two columns with ordinary names.
The data holds some special characters, and first I thought this might
influence the process as well. But the version where I deleted those
entries does not behave differently.
Very strange.

Meanwhile, I exported the file to a csv, imported this one successfully
and then saved as gpkg. So at least, the data is in and working.


Thanks,
Bernd


Am 11.03.22 um 21:38 schrieb chris hermansen:

Bernd and list,

On Fri, Mar 11, 2022, 12:08 Bernd Vogelgesang via Qgis-user
 wrote:

Hi folks,

for quite some time, I hold frequently changing data in a xlsx-file.
Working in a spreadsheet application is so much more efficient
sometimes.

This spreadsheet easily imports by drag and drop, the import
dialog pops
up where to choose which tab to import, and finally the table is there
with the first row as column heads.

Now, I'm getting just nuts.

I'm trying to do the same with other data, and whatever I try, it
imports the table ignoring the header row, so its Field1, Field2...

Findings so far:

I had a long file name. With this, there was no import dialog, but the
first tab was imported immediately, but without the header row.

I saved the file with a short file name, and now the import dialog
asks
which tab to import. But still, the first data-row is ignored.

Dragging my other already existing file into that project works just
perfectly.

What could be the reason for this behaviour?


Clutching at straws here...

Sometimes when making a pivot table in LibreOffice calc I notice that
column headings (first row) aren't interpreted as such.

This seems to occur on the following scenarios:

1) a column has an en empty cell in row 1 (or missing title)

2) a column exists outside the area of interest with no header (this
probably would not apply in your case, but maybe you have some
calculations to the right of your data which don't have a column header)

3) there are some "strange" characters in one or more header fields (I
can't recall precisely what constitutes "strange")


What you might want to do is save a copy of your spreadsheet, then
delete anything to the left or right of your columns, and check that
your column names are all "legal variable" names ie begin with a
letter, only letters and numbers

I hope this helps; good luck!

Chris
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[Qgis-user] Importing spreadsheet: Strange behaviour

[Bernd Vogelgesang via Qgis-user]

Hi folks,

for quite some time, I hold frequently changing data in a xlsx-file.
Working in a spreadsheet application is so much more efficient sometimes.

This spreadsheet easily imports by drag and drop, the import dialog pops
up where to choose which tab to import, and finally the table is there
with the first row as column heads.

Now, I'm getting just nuts.

I'm trying to do the same with other data, and whatever I try, it
imports the table ignoring the header row, so its Field1, Field2...

Findings so far:

I had a long file name. With this, there was no import dialog, but the
first tab was imported immediately, but without the header row.

I saved the file with a short file name, and now the import dialog asks
which tab to import. But still, the first data-row is ignored.

Dragging my other already existing file into that project works just
perfectly.

What could be the reason for this behaviour?


Cheers,

Bernd




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Re: [Qgis-user] Attachment and links used for this list.

[Bernd Vogelgesang via Qgis-user]

Attachments are allowed, but you have to keep it under 100kb! So better sth 
like 50kb, if you also have a lot of textwith it

On 09.03.22 18:07, Mike Breiding - Morgantown WV via Qgis-user 
 wrote:

Apparently attachments are not permitted and HTML links are scrubbed.
How does one share a graphic with the list?
WV-Mike


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Re: [Qgis-user] question about DATE of satellite ESRI and Google basemaps in QuickMapServices Plugin

[Bernd Vogelgesang via Qgis-user]

Hi,

I can remember that there was this question a while ago. Though I do not 
remember the answer.

But my guess is, that in Google Earth e.a. , you are shown the year of the 
picture, while those in Google Maps e.g. are sometimes different, and there is 
no way to find out how old they are.

Maybe for the ESRI-stuff you might have more luck using their REST-service to 
load those images (did this lng time ago, have no clue anymore)


Cheers,

Bernd

On 10.03.22 19:44, Nick Jadallah via Qgis-user  
wrote:

Hello,

I have installed QuickMapServices for QGIS to have more basemap options.
I have used the "Google Satellite" and "ESRI Satellite" basemaps. It
just occurred to me that the YEAR in which these maps were published
(i.e. which year the satellite image data is from) is important for my
project. Do you know what year they are from? Or, if not, do you know
where I can find this information?

Thank you very much for any help or guidance you can provide!


-Nick

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Re: [Qgis-user] Automating creation of county distribution maps

[Bernd Vogelgesang via Qgis-user]

As long as the informations are this vague and we do not know what his
data-sets looks alike, there is no use in proposing a workflow.

The spreadsheet approach sounds horrible to me ;)

Bernd


Am 10.03.22 um 18:49 schrieb Nicolas Cadieux via Qgis-user:

Hi,

I’am not quite sure what processes you want automated but if the step
previously described suit your needs, then all the steps could be
incorporated into a model and this model, like any algorithm found in
« processing » can be batched.

Nicolas Cadieux
https://gitlab.com/njacadieux


Le 10 mars 2022 à 08:07, Mike Breiding - Morgantown WV via Qgis-user
 a écrit :


I appreciate you taking the time for writing such a detailed set of
instructions.
However, it is quicker for me to do it manually.

If the process could be automated then of course it would be a
different matter.
I am working only with the ferns - less than a hundred records.
The flower plants are over 2500.

Thanks,
WV-Mike
=
On 3/9/2022 3:46 PM, David Strip wrote:

As first step towards building a model as Nicolas has suggested:
I assume you have a layer with the county boundaries. Export this
layer as a CSV file, keeping only the name of each county in the
export step, and don't export the geometry.
Now open this file in your spreadsheet app of choice.
Add a new column for each plant species.
Put a one in that column for each county where the species is present.
Save the file (still as CSV).

Open the county layer and the new CSV files in Ggis.
Open the properties window for the county layer and click on the
Joins tab.
Click on the "+" to add a new join. Join to the CSV layer, and
select the county names field as the join field for each.

Now your county layer has the plant species column.
To display a single species, open the properties window for the
county layer, select symbology. Set the symbology as rule based. To
color just those counties with species 1, your rule would say
something like Species1 = 1, where Species1 is the field name you
used. Pick a color/transparency of your choice, then set the "all
others" rules to be the background color you want.

That does it for one species. You can then export to tiff or
whatever. Getting it to cycle through all the different species is
for someone else to explain.


-- Mike Breiding www.EpicRoadTrips.us
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Re: [Qgis-user] Raster calculation: if Layer1 is > 1, then Layer2 should be 0

[Bernd Vogelgesang]

Hi Nyall,


I think, the problem with the native raster calculator in my case have
something to do with the zoo of raster formats.
My 1m-DEM was float, while the reclassified layer (0 or 1) was integer.
The GDAL-calculator seems to be agnostic to that.

Thanks a lot for your support

Bernd

Am 18.02.22 um 00:23 schrieb Nyall Dawson:

On Fri, 18 Feb 2022 at 09:22, Nyall Dawson  wrote:


By
not setting a "maximum" value in the row we indicate that the range is
from 100 < input value < +infinity.

Gah, that should be "1 < input value < +infinity"!
Nyall

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Re: [Qgis-user] Raster calculation: if Layer1 is > 1, then Layer2 should be 0

[Bernd Vogelgesang]

Hi Nyall,

sorry, mixed things up. The native raster calculator only threw errors,
while the GDAL worked.

Now that I tried again, everything is fine. Strange hickup.

Anyway, everything ist fine now and things start getting sorted.

Happy again :)

Cheers,

Bernd



Am 17.02.22 um 23:22 schrieb Nyall Dawson:

On Fri, 18 Feb 2022 at 08:08, Bernd Vogelgesang
 wrote:

Hi Sebastian,

thanx, that worked.

But somehow, the hole process feels a bit clumsy.

Having to fumble together a classification with "thru" (juck!), then the 
toolbox reclassify just seems to be broken,

Which reclassify tool are you referring to exactly? The native QGIS
ones are 100% NOT broken. (The SAGA one may be, but that's a 3rd party
tool.)

Nyall


gladly gdal calculator does ...

Why isn't there some "raster SQL" that saves one from all these stupid single 
steps?

Ok, will then try to build a model and hope it will work for the tests to come…

Thanks a lot,

Bernd


Am 17.02.22 um 22:19 schrieb Sebastian Gutwein:

Reclassify your Layer 1 to be anything greater than 1 = 0 everything else 
equals 1. This will give you a binary 1 and 0 raster (Layer 3)  that you can 
use in the raster calculator: Layer 2 * Layer 3.  Anywhere where layer 3 is 1 
your layer 2 values will stay the same and anywhere where layer 3 is 0 your 
layer 2 values will become 0.

On Thu, Feb 17, 2022 at 3:19 PM Bernd Vogelgesang  
wrote:

Hi folk,

I hardly never work with raster calculations, and unfortunately there is 
nowhere a collection of syntax examples for different use cases to be found 
(documentation :( ).

Anything apart from +-*/ is beyond my scope.

So,

I made a viewshed analysis over a digital surface model (try the awesome 
Visibility Analysis plugin form Zoran Čučković and buy him a beer!)

A lot of "views" are caught by tree canopy, but I am only interest in the flat 
grounds.

So I substracted the surface model layer from the ground model layer, and this 
is Layer 1.

Giving a threshold of 1 meters difference for inaccuracities, all pixels in 
this layer above 1 should result in 0 (zero) in my viewshed raster (Layer 2)

Please give me some hints,

Cheers,

Bernd


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Re: [Qgis-user] Raster calculation: if Layer1 is > 1, then Layer2 should be 0

[Bernd Vogelgesang]

Hi Sebastian,

thanx, that worked.

But somehow, the hole process feels a bit clumsy.

Having to fumble together a classification with "thru" (juck!), then the
toolbox reclassify just seems to be broken, gladly gdal calculator does ...

Why isn't there some "raster SQL" that saves one from all these stupid
single steps?

Ok, will then try to build a model and hope it will work for the tests
to come…

Thanks a lot,

Bernd


Am 17.02.22 um 22:19 schrieb Sebastian Gutwein:

Reclassify your Layer 1 to be anything greater than 1 = 0 everything
else equals 1. This will give you a binary 1 and 0 raster (Layer 3) 
that you can use in the raster calculator: Layer 2 * Layer 3. 
Anywhere where layer 3 is 1 your layer 2 values will stay the same and
anywhere where layer 3 is 0 your layer 2 values will become 0.

On Thu, Feb 17, 2022 at 3:19 PM Bernd Vogelgesang
 wrote:

Hi folk,

I hardly never work with raster calculations, and unfortunately
there is nowhere a collection of syntax examples for different use
cases to be found (documentation :( ).

Anything apart from +-*/ is beyond my scope.

So,

I made a viewshed analysis over a digital surface model (try the
awesome Visibility Analysis plugin form Zoran Čučković and buy him
a beer!)

A lot of "views" are caught by tree canopy, but I am only interest
in the flat grounds.

So I substracted the surface model layer from the ground model
layer, and this is Layer 1.

Giving a threshold of 1 meters difference for inaccuracities, all
pixels in this layer above 1 should result in 0 (zero) in my
viewshed raster (Layer 2)

Please give me some hints,

Cheers,

Bernd


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[Qgis-user] Raster calculation: if Layer1 is > 1, then Layer2 should be 0

[Bernd Vogelgesang]

Hi folk,

I hardly never work with raster calculations, and unfortunately there is
nowhere a collection of syntax examples for different use cases to be
found (documentation :( ).

Anything apart from +-*/ is beyond my scope.

So,

I made a viewshed analysis over a digital surface model (try the awesome
Visibility Analysis plugin form Zoran Čučković and buy him a beer!)

A lot of "views" are caught by tree canopy, but I am only interest in
the flat grounds.

So I substracted the surface model layer from the ground model layer,
and this is Layer 1.

Giving a threshold of 1 meters difference for inaccuracities, all pixels
in this layer above 1 should result in 0 (zero) in my viewshed raster
(Layer 2)

Please give me some hints,

Cheers,

Bernd



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Re: [Qgis-user] Problème de crash répétitif sur manipulations basiques

[Bernd Vogelgesang]

deepl translates this to:

I would like to contact you because I would like to have additional
information concerning the use of the software on a laptop.

Indeed, as part of my work, I use QGIS 3.16.11 daily.

Unfortunately, I regularly run into problems with simple operations.

To give you an idea, I regularly copy/paste entities onto the
corresponding attribute tables, but these sometimes correspond to 20,000
entities to be copied

My intel core i5 laptop does not support this manipulation and the
software automatically crashes.

Other tools such as the rastoriel fusion or the vectorial cutting but
almost impossible with so many entities because either that crashes
directly or that grinds during a few days to see the end of it.

After having seen with the IT company of our structure, I was asked to
contact you to know how to solve the problem.

I have already made a number of updates (graphics card, etc) but to no
avail.

What do you recommend to fix this so that I can use all the features of
QGIS?

Translated with www.DeepL.com/Translator (free version)


Furthermore: There is a size limit for emails in this list of 100kb.
Your logos in your email eat up 70kb (!) of this, so my first reply with
a copy of your entire message already exceeded this limit and got blocked.


Cheers,

Bernd


Am 08.02.22 um 10:13 schrieb SERVICE TECHNIQUE:


Madame ; Monsieur ;

Je me permets de vous contacter, car j’aimerais avoir des informations
complémentaires concernant l’utilisation du logiciel sur un PC portable.

En effet dans le cadre de mon travail, j’utilise quotidiennement QGIS
3.16.11.

Malheureusement, il m’arrive régulièrement des beugues sur des
manipulations simples.

Pour vous donner un ordre d’idée je pratique régulièrement le
copier/coller d’entités sur des tables attributaires correspondantes,
mais celles-ci correspondent parfois à 20 000 entités à copier

Mon PC portable intel core i5 ne supporte pas cette manipulation est
le logiciel se met automatiquement en crash.

D’autres outils comme la fusion rastoriel ou bien le découpage
vectoriel mais presque impossible avec autant entités car soit ça
crash directement ou alors ça mouline pendants quelques jours sens en
voir le bout.

Après avoir vu avec la société informatique de notre structure il m’a
été demandé de vous contacter pour savoir comment régler le problème.

Il a déjà fait une multitude de mises à jour (carte graphique, etc)
mais sans résultats.

Que préconisez-vous pour remédier à ça pour que je puisse utiliser
toutes les fonctionnalités de QGIS ?

En vous remerciant par avance.

Cordialement.


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Re: [Qgis-user] Include Comment in source Query

[Bernd Vogelgesang]

mhm, seems to be this open issue maybe

https://github.com/qgis/QGIS/issues/38359


Am 03.02.22 um 19:34 schrieb Hugh Kelley:

Ah thanks yes agreed on the shp front.

I'm not finding success with gpkg using QGIS 3.16.11 either though.

On Thu, Feb 3, 2022 at 1:27 PM Bernd Vogelgesang
 wrote:

Hi,

here are my findings from 2015:


https://gis.stackexchange.com/questions/107522/is-it-possible-to-use-comments-in-qgis-query-builder-with-esri-shapefiles/149448#149448

In short: comments with shape files did not (do not maybe still ) work

Solution: Just do not use ESRI-Shape files for work ;)

Cheers,

Bernd

Am 03.02.22 um 15:33 schrieb Hugh Kelley:

Very helpful point, it is a shapefile.

so far "#", "--", "//" and "/* */" did not work. I also tried
"" for good measure which didn't work as well.

I tried a few of those on a geopackage too  and they errored out
there as well.

I'll try a postgis datas source later today if I remember.

On Thu, Feb 3, 2022 at 9:23 AM Johannes Kröger (WhereGroup)
 wrote:

Hi Hugh,

that depends on the provider in use, a PostGIS provider might
behave differently from a Shapefile. See if wrapping the
comment in /* comment */ works.

Cheers, Hannes

Am 03.02.22 um 15:16 schrieb Hugh Kelley:

Hi all,

in the Layer Properties >> source >> Query Builder dialogue,
if I use "--" it shows that I've commented out that line.
when I test the query though, it throws an error complaining
about the comment I included.

Is there a way to include a comment in the query?

i've like to include a note to myself when I filter things
sometimes as it can be hard months or years later to figure
out the motivation. for example:

-- remove built neighborhood bikeway according to KML file
from client, per email 2022-02-03
"LOCAL_ID" NOT IN (4030, 3533, 4307, 6015, 5217)

Maybe there's a better way to include this note, but it
seems that the closer the note is to the filter query
definition the more likely I am to see it.

thanks

Hugh


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--
Johannes Kröger / GIS-Entwickler/-Berater
WhereGroup GmbH
Grevenweg 89
20537 Hamburg
Germany

Tel: +49 (0)228 / 90 90 38 - 36
Fax: +49 (0)228 / 90 90 38 - 11

johannes.kroe...@wheregroup.com
www.wheregroup.com  <http://www.wheregroup.com>
Geschäftsführer:
Olaf Knopp, Peter Stamm
Amtsgericht Bonn, HRB 9885
---

-
Schon gewusst?

In unserem Blog geben wir Tipps & Tricks zu
 Open-Source-GIS-Software
und berichten aus unserem Experten-Alltag:
https://wheregroup.com/blog/
-

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--
Hugh Kelley


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--
Hugh Kelley

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Re: [Qgis-user] Include Comment in source Query

[Bernd Vogelgesang]

Hi,

here are my findings from 2015:

https://gis.stackexchange.com/questions/107522/is-it-possible-to-use-comments-in-qgis-query-builder-with-esri-shapefiles/149448#149448

In short: comments with shape files did not (do not maybe still ) work

Solution: Just do not use ESRI-Shape files for work ;)

Cheers,

Bernd

Am 03.02.22 um 15:33 schrieb Hugh Kelley:

Very helpful point, it is a shapefile.

so far "#", "--", "//" and "/* */" did not work. I also tried "" for good measure which didn't work as well.

I tried a few of those on a geopackage too  and they errored out there
as well.

I'll try a postgis datas source later today if I remember.

On Thu, Feb 3, 2022 at 9:23 AM Johannes Kröger (WhereGroup)
 wrote:

Hi Hugh,

that depends on the provider in use, a PostGIS provider might
behave differently from a Shapefile. See if wrapping the comment
in /* comment */ works.

Cheers, Hannes

Am 03.02.22 um 15:16 schrieb Hugh Kelley:

Hi all,

in the Layer Properties >> source >> Query Builder dialogue, if I
use "--" it shows that I've commented out that line. when I test
the query though, it throws an error complaining about the
comment I included.

Is there a way to include a comment in the query?

i've like to include a note to myself when I filter things
sometimes as it can be hard months or years later to figure out
the motivation. for example:

-- remove built neighborhood bikeway according to KML file from
client, per email 2022-02-03
"LOCAL_ID" NOT IN (4030, 3533, 4307, 6015, 5217)

Maybe there's a better way to include this note, but it seems
that the closer the note is to the filter query definition the
more likely I am to see it.

thanks

Hugh


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--
Johannes Kröger / GIS-Entwickler/-Berater
WhereGroup GmbH
Grevenweg 89
20537 Hamburg
Germany

Tel: +49 (0)228 / 90 90 38 - 36
Fax: +49 (0)228 / 90 90 38 - 11

johannes.kroe...@wheregroup.com
www.wheregroup.com  
Geschäftsführer:
Olaf Knopp, Peter Stamm
Amtsgericht Bonn, HRB 9885
---

-
Schon gewusst?

In unserem Blog geben wir Tipps & Tricks zu
 Open-Source-GIS-Software
und berichten aus unserem Experten-Alltag:
https://wheregroup.com/blog/
-

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--
Hugh Kelley


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Re: [Qgis-user] topological editing geographic data fails

[Bernd Vogelgesang]

Hi,

this is an unfortunately long standing issue:

https://github.com/qgis/QGIS/issues/29648

In short: project crs and data crs have to be the same

Cheers,

Bernd

Am 27.01.22 um 12:19 schrieb Klaus Mithöfer:

Hello List,

I tried to edit geographic data (Linestrings, 4326) in a Geopackage
but I failed to use the topological editing to move joint vertices. I
also had problems with snapping on segments and/or vertices. It always
snapped to the next vertex (snapping distance in pixel).

Does it work with projected data only?

If I reproject the layer to UTM 25832 everything is fine.

I work with QGIS 3.16

Kind regards, Klaus
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[Qgis-user] Virtual Layer query with "currentExtent" not working anymore

[Bernd Vogelgesang]

Hi folks,

A while ago, I figured out how to limit a query on a layer by the
current map extent as a preparation for another query:

SELECT * FROM ASK_Geometrien WHERE
st_intersects(ASK_Geometrien.geometry, currentExtent());

Now, when I try it again later, the test fails with "no such function:
currentExtent"

Has something changed or are there other means to achieve the same goal?

QGIS 3.22.3-Białowieża

Cheers,

Bernd




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Re: [Qgis-user] loading geologic symbol library

[Bernd Vogelgesang]

Hey Benoit,

now all is fine :) Can imagine that it's not so easy to keep everything
up to date .
E.g. the geological stuff from the Resource Sharing Plugin seems to be
mainly non-functional as well at the moment ...

Thanx a bunch!

Bernd


Am 13.01.22 um 17:36 schrieb info:


Hi Bernd,

Oops! Some files did not upload at all... Please try again to download
the FGDC folder.

32 files should be in 700-LithoMetalIgneousVein folder.

Cheers,
Benoit


On 13/01/2022 18:16, Bernd Vogelgesang wrote:


Hi Benoit,

thanx a ton! Now it works. Just, symbols for 703 to 733 are question
marks again.

Cheers,

Bernd

Am 13.01.22 um 15:20 schrieb info:


Hi Bernd,

You're right the xml's on the repo do point to non-existent folders.

I've added a FGDC folder to the repo with the correct folder
structure. Copy that folder (FGDC) into one of QGIS svg path folders
and you can then use the xml files to import the svg symbols.

Cheers,
Benoit



On 13/01/2022 15:04, Bernd Vogelgesang wrote:


Hi Benoit,


sorry for the confusion. I specifically refer to your answer and
the linked project. There is a svg-folder and a folder with the
xml-files from the download.

Setting the path to the svg-folder and then importing the xml is
simply not successful.

As you refered to this project, I assumed that you successfully
imported those styles.

Cheers,

Bernd



Am 13.01.22 um 13:56 schrieb info:


Hi Bernd,

Thanks for your comments. It seems I've misread Byron's problem
and assumed that his library is wrapped up into an xml file!

In order to use the solution I've provided you need to have an xml
"library" file describing the .svg files.
Then you point *Settings -> Style Manager... -> Import/Export ->
Import Item(s)...*to the xml file not the svg files.


@Byron, open one of your svg files with a text editor. Does the
first line starts with "'?
If not you probably have downloaded html files embedding svg images!

Cheers,
Benoit


On 13/01/2022 14:32, Bernd Vogelgesang wrote:


Hi Benoit,

I just tried to import the symbols from the page you mentioned
which leads to this repository:
https://github.com/BC-Consulting/FGDC-4-QGIS/

Now, even with all explanations given, the import seems not to
work properly.

no matter what path I add for the FDGC folder (just the .../FDGC
or the .../FDGC/svg path) , on import, it says, that

- the symbols are already there and gives the option to overwrite
or skip,


This is "normal" behaviour, so just say "overwrite"


- the option to add comma-separted tags (e.g. Geology) does not
work, and no tag at all is given

- all symbols are just question marks

Are those guidelines just precisely unprecise, or am I just to
dumb to understand whats asked from me?

Cheers

Bernd



Am 13.01.22 um 07:56 schrieb info:


Hi Byron,

*Settings -> Style Manager... -> Import/Export -> Import Item(s)...*

See https://www.geoproc.com/be/qgis-fgdc.htm for more info.

Best regards,
Benoit


On 12/01/2022 23:12, Firstname Lastname wrote:

i have download a geologic symbol library from Rod Holcolme, a
geology prof in australia.  i have set up the path for the
files via the Options>system>.svg path.
this seems to have linked to the directory, but i can not
figure out how to see the files.
within the directory, there are several files that show up as
microsoft edge html files with the file types as shown below.

GeoQSymbols/DipDir/001%20Bedding%20(dipdir).svg

Can anyone help me to get these imported.  i can not get them
imported .
thanks for your help
--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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Re: [Qgis-user] loading geologic symbol library

[Bernd Vogelgesang]

Hi Benoit,

thanx a ton! Now it works. Just, symbols for 703 to 733 are question
marks again.

Cheers,

Bernd

Am 13.01.22 um 15:20 schrieb info:


Hi Bernd,

You're right the xml's on the repo do point to non-existent folders.

I've added a FGDC folder to the repo with the correct folder
structure. Copy that folder (FGDC) into one of QGIS svg path folders
and you can then use the xml files to import the svg symbols.

Cheers,
Benoit



On 13/01/2022 15:04, Bernd Vogelgesang wrote:


Hi Benoit,


sorry for the confusion. I specifically refer to your answer and the
linked project. There is a svg-folder and a folder with the xml-files
from the download.

Setting the path to the svg-folder and then importing the xml is
simply not successful.

As you refered to this project, I assumed that you successfully
imported those styles.

Cheers,

Bernd



Am 13.01.22 um 13:56 schrieb info:


Hi Bernd,

Thanks for your comments. It seems I've misread Byron's problem and
assumed that his library is wrapped up into an xml file!

In order to use the solution I've provided you need to have an xml
"library" file describing the .svg files.
Then you point *Settings -> Style Manager... -> Import/Export ->
Import Item(s)...*to the xml file not the svg files.


@Byron, open one of your svg files with a text editor. Does the
first line starts with "'?
If not you probably have downloaded html files embedding svg images!

Cheers,
Benoit


On 13/01/2022 14:32, Bernd Vogelgesang wrote:


Hi Benoit,

I just tried to import the symbols from the page you mentioned
which leads to this repository:
https://github.com/BC-Consulting/FGDC-4-QGIS/

Now, even with all explanations given, the import seems not to work
properly.

no matter what path I add for the FDGC folder (just the .../FDGC or
the .../FDGC/svg path) , on import, it says, that

- the symbols are already there and gives the option to overwrite
or skip,


This is "normal" behaviour, so just say "overwrite"


- the option to add comma-separted tags (e.g. Geology) does not
work, and no tag at all is given

- all symbols are just question marks

Are those guidelines just precisely unprecise, or am I just to dumb
to understand whats asked from me?

Cheers

Bernd



Am 13.01.22 um 07:56 schrieb info:


Hi Byron,

*Settings -> Style Manager... -> Import/Export -> Import Item(s)...*

See https://www.geoproc.com/be/qgis-fgdc.htm for more info.

Best regards,
Benoit


On 12/01/2022 23:12, Firstname Lastname wrote:

i have download a geologic symbol library from Rod Holcolme, a
geology prof in australia.  i have set up the path for the files
via the Options>system>.svg path.
this seems to have linked to the directory, but i can not figure
out how to see the files.
within the directory, there are several files that show up as
microsoft edge html files with the file types as shown below.

GeoQSymbols/DipDir/001%20Bedding%20(dipdir).svg

Can anyone help me to get these imported.  i can not get them
imported .
thanks for your help
--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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Re: [Qgis-user] loading geologic symbol library

[Bernd Vogelgesang]

Hi Benoit,


sorry for the confusion. I specifically refer to your answer and the
linked project. There is a svg-folder and a folder with the xml-files
from the download.

Setting the path to the svg-folder and then importing the xml is simply
not successful.

As you refered to this project, I assumed that you successfully imported
those styles.

Cheers,

Bernd



Am 13.01.22 um 13:56 schrieb info:


Hi Bernd,

Thanks for your comments. It seems I've misread Byron's problem and
assumed that his library is wrapped up into an xml file!

In order to use the solution I've provided you need to have an xml
"library" file describing the .svg files.
Then you point *Settings -> Style Manager... -> Import/Export ->
Import Item(s)...*to the xml file not the svg files.


@Byron, open one of your svg files with a text editor. Does the first
line starts with "'?
If not you probably have downloaded html files embedding svg images!

Cheers,
Benoit


On 13/01/2022 14:32, Bernd Vogelgesang wrote:


Hi Benoit,

I just tried to import the symbols from the page you mentioned which
leads to this repository: https://github.com/BC-Consulting/FGDC-4-QGIS/

Now, even with all explanations given, the import seems not to work
properly.

no matter what path I add for the FDGC folder (just the .../FDGC or
the .../FDGC/svg path) , on import, it says, that

- the symbols are already there and gives the option to overwrite or
skip,


This is "normal" behaviour, so just say "overwrite"


- the option to add comma-separted tags (e.g. Geology) does not work,
and no tag at all is given

- all symbols are just question marks

Are those guidelines just precisely unprecise, or am I just to dumb
to understand whats asked from me?

Cheers

Bernd



Am 13.01.22 um 07:56 schrieb info:


Hi Byron,

*Settings -> Style Manager... -> Import/Export -> Import Item(s)...*

See https://www.geoproc.com/be/qgis-fgdc.htm for more info.

Best regards,
Benoit


On 12/01/2022 23:12, Firstname Lastname wrote:

i have download a geologic symbol library from Rod Holcolme, a
geology prof in australia.  i have set up the path for the files
via the Options>system>.svg path.
this seems to have linked to the directory, but i can not figure
out how to see the files.
within the directory, there are several files that show up as
microsoft edge html files with the file types as shown below.

GeoQSymbols/DipDir/001%20Bedding%20(dipdir).svg

Can anyone help me to get these imported.  i can not get them
imported .
thanks for your help
--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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Re: [Qgis-user] loading geologic symbol library

[Bernd Vogelgesang]

Hi Benoit,

I just tried to import the symbols from the page you mentioned which
leads to this repository: https://github.com/BC-Consulting/FGDC-4-QGIS/

Now, even with all explanations given, the import seems not to work
properly.

no matter what path I add for the FDGC folder (just the .../FDGC or the
.../FDGC/svg path) , on import, it says, that

- the symbols are already there and gives the option to overwrite or skip,

- the option to add comma-separted tags (e.g. Geology) does not work,
and no tag at all is given

- all symbols are just question marks

Are those guidelines just precisely unprecise, or am I just to dumb to
understand whats asked from me?

Cheers

Bernd



Am 13.01.22 um 07:56 schrieb info:


Hi Byron,

*Settings -> Style Manager... -> Import/Export -> Import Item(s)...*

See https://www.geoproc.com/be/qgis-fgdc.htm for more info.

Best regards,
Benoit


On 12/01/2022 23:12, Firstname Lastname wrote:

i have download a geologic symbol library from Rod Holcolme, a
geology prof in australia.  i have set up the path for the files via
the Options>system>.svg path.
this seems to have linked to the directory, but i can not figure out
how to see the files.
within the directory, there are several files that show up as
microsoft edge html files with the file types as shown below.

GeoQSymbols/DipDir/001%20Bedding%20(dipdir).svg

Can anyone help me to get these imported.  i can not get them imported .
thanks for your help
--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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[Qgis-user] Error installing ubuntu nightly

[Bernd Vogelgesang]

Hi,

in the hope that the nightly build of 3.22.x got an error fixed, I tried
to install it from the repositories.
(https://qgis.org/ubuntu-nightly-release
)

This shows up when trying to start qgis:

/usr/bin/qgis.bin: symbol lookup error: /usr/bin/qgis.bin: undefined
symbol: _ZN14QgsApplication9setLocaleERK7QLocale

Any ideas what this means and how to fix it?

Cheers,

Bernd

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Re: [Qgis-user] adding a simple filled polygon

[Bernd Vogelgesang]

Hi,

from what I understand, you just need to make your new layer editable
(pencil symbol), then you can see the symbol for adding a polygon.

Besides that: Be aware that the original coordinate system of GPS points
is EPSG 4326 (unit degrees), and so is the default CRS for layers in
QGIS. In case you want to do more sophisticated operations later with
your data, you should reproject them to a local metric coordinate
system. Tricky topic for beginners. The toolbox is your friend.

Cheers,

Bernd

Am 17.12.21 um 11:10 schrieb Johan De Groote:

Hello, I'm new to QGIS (and gis in general). For the job I need to make events 
logged form a GPS visible on a map. The events are when we enter or leave a 
zone defined as a polygon.

I managed to get the openstreet view in the background and each type of events 
(entering and leaving) on a separate layer. This worked fine following a 
tutorial I found on the net. Just what I need.

But now I want to enter the zones. These are defined as polygons with each cornerpoint 
defined by GPS coordinates. I have already set those points on a separate layer. Now I 
read the handbook but it is not very clear. It starts with adding a new shape layer (ok). 
But then it gets very muddly for me. I tried a tutorial but this is for older versions of 
QGIS (just as the training manual on the QGIS website) and they talk about "click 
the add a polygon icon" which isn't to be found.

So is there somewher a tutorial on how to add a filled polygon on a map when 
you have the points as GPS coordinates? I can add the polygon capturing the 
points on the map, that kind of precision is acceptable for my needs.

Thanks,
Johan

Using:

QGIS version
3.22.0-Białowieża
QGIS code branch
Release 3.22
Qt version
5.15.2
Python version
3.9.9
GDAL/OGR version
3.3.3
PROJ version
8.2.0
EPSG Registry database version
v10.038 (2021-10-21)
GEOS version
3.10.0-CAPI-1.16.0
SQLite version
3.35.5
PostgreSQL client version
No support
SpatiaLite version
5.0.1
QWT version
6.1.5
QScintilla2 version
2.11.6
OS version
Gentoo/Linux
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Re: [Qgis-user] Buffer by Attribute Issue

[Bernd Vogelgesang]

The list accepts, I think, 100kb, so you might want to dump your .mp4
somewhere else and post a link.

EPSG 3857 is not the most clever CRS to work with, but that depends on
your points locations and what you want to do with them.


Am 16.12.21 um 16:08 schrieb Peter Devanney:

Chris

The buffer input is a point the lat and long are Doubles. The buffer
distance variable is a Double. Using EPSG 3857 for all.

Not sure what the protocol on the list is or if it will accept a small
2 MB .mp4 but I can show what I am doing for workflow if that might help?

thanks Chris

Peter

On Wed, Dec 15, 2021 at 6:42 PM chris hermansen mailto:clherman...@gmail.com>> wrote:

Peter and list,

On Wed, Dec 15, 2021 at 7:26 AM Peter Devanney mailto:pe...@devanney.ca>> wrote:

Hi Folks

Have a table full of points that I want to buffer by a
variable distance. The distance is an attribute in the input
table in km.

Using Vector>Geoprocessing>Buffer It works fine if I specify a
fixed buffer.

When I run it with the attribute selected it runs fine but it
will not paint the buffers. At first I thought I had a unit
issue so added an expression to multiply the attribute by 1000
to get to km from m as I wasn't sure if the default was m.

The buffered output behaves totally normally so I can label,
and zoom to features... All looks fine except no actual
buffers draw. Symbology panel looks normal.

Just wondering if anyone has seen this or knows of a
workaround or thoughts on what I am doing wrong.

What is the type of your buffer item?  What are the typical values?

What is your CRS?


--
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.


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Re: [Qgis-user] Buffer by Attribute Issue

[Bernd Vogelgesang]

Hi,

sorry, but can't reproduce your problem (but on Linux Mint QGIS 3.22).
Generated 100 random points and added a field "buffer" from $id*10.
Everything fine here.

Bernd

Am 15.12.21 um 16:26 schrieb Peter Devanney:

Hi Folks

Have a table full of points that I want to buffer by a variable
distance. The distance is an attribute in the input table in km.

Using Vector>Geoprocessing>Buffer It works fine if I specify a fixed
buffer.

When I run it with the attribute selected it runs fine but it will not
paint the buffers. At first I thought I had a unit issue so added an
expression to multiply the attribute by 1000 to get to km from m as I
wasn't sure if the default was m.

The buffered output behaves totally normally so I can label, and zoom
to features... All looks fine except no actual buffers draw. Symbology
panel looks normal.

Just wondering if anyone has seen this or knows of a workaround or
thoughts on what I am doing wrong.

I am running 3.16.8 Hannover on mac OS 11.6

thanks

Peter

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Re: [Qgis-user] Newby question on mapping information

[Bernd Vogelgesang]

Hi,

from what I read and understand:

1. "with separate layers for boundaries of each plot and unique" If I
understand this correctly, every polygon has a unique layer?
Then Processing -> Toolbox -> Merge vector layers

If I understood this wrong, skip this step.

2. Toolbox -> Join attributes by field value -> Pick your boundaries
layer and the csv and set the common field

3. Layer properties -> Symbology -> Change from Single Symbol to
Categorized -> pick a field from which you can distinct the ownership ->
Classify


Good luck

Am 09.12.21 um 17:57 schrieb Miro Lucassen:

Hi, this is probably easy for experienced users, but I am stuck in the 
interface as this is my first project in QGIS.
Aim of project: map of a part of an Dutch municipal authority, marked areas 
that are owned by the local authorities.
Input 1: KML-file of all registered property (kadaster) in the relevant area 
plus a bit more, with separate layers for boundaries of each plot and unique 
ID, including geo-information
Input 2: CSV-file of all property owned by the Municipality in the relevant 
area plus a bit more, with same ID as the general KML-file, no geo-information

I see the map of all property, I have imported the municipality-plots as a 
separate layer, but now what? How do I connect the relevant property to the 
map, and how do I create a visualisation that shows the plots owned by the 
Municipality?

Any help is greatly appreciated.

Miro Lucassen,
The Netherlands
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Re: [Qgis-user] Changing default pop-up attribute when using Identify tool

[Bernd Vogelgesang]

Hi,

I doubt that there is a simple way to change the behaviour of the
identify tool.

Recently, I came up with an idea how to quickly display whatever value
or even calculations by circumventing the identify tool but use a
special label setting and using the select tool.

Have a look here: https://gis.stackexchange.com/a/416224/8202

This example is about showing the area of a selected polygon, but
instead of the formula, you can put in every attribute of a layer.

Cheers,

Bernd

Am 08.12.21 um 21:01 schrieb Holly McLachlan:

Is there a simple way to change the attribute table record that is
automatically displayed in the right side pop-up panel when using the
identify tool. I'm trying to single out a point feature in a point
shapefile with a large set of attributes. I want to see only one
associated row from the attribute table -- one that displays soil Li
values in ppms. Currently the panel that pop ups on the right side of
the map viewer shows these data under the "Action" sub-tree, but only
for another row (record). I need to change the default record that is
called by this tool.

Thank you,

--
Holly S Mclachlan
(775) 762-3408

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Re: [Qgis-user] Count points in a polygon

[Bernd Vogelgesang]

The is also a question on this matter at gis.stackexchange.com

https://gis.stackexchange.com/q/330383/8202

using functions.

I think it might be best to use them with a virtual field, so the field
automatically updates when the point layer was changed.


Am 24.11.21 um 09:24 schrieb Raffaele Ceretto:

Good morning,

I have 2 different layer: one is a point layer e the other is a
polygon layer.

I would like count how many points there are in a polygon.
I don't want using the analyses tool "counts the points in a polygon"
because this function create a new layer whit the count.
I would like create a new field in the poligon layer attribute table
that count automatically the point.

Could you help me please?

Best regards

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Re: [Qgis-user] importing dwg/dxf

[Bernd Vogelgesang]

On 21.11.21 15:35, Nicolas Cadieux wrote:

Hi,

.dwg or dxf have no CRS.  They can be in inches, feet, mm, cm, m...
Usually meter in a local CRS like a local WGS84 UTM ZONE is used.  You
can usually find this in the metadata if available.

Nicolas


I have no deep technical insight into dwg or dxf, but I am pretty sure
that those  CAD-"products" are able to be produced with valid
coordinates, fitting to a common CRS. Most people using CAD-systems
simply seem to be either too stupid for that, or just do not care.

One of the reasons, CAD-"data" is produced with a local reference system
instead with a normal CRS is, according to an CAD-operator I once asked
about this, that some CAD-systems just slow down to in-operability when
using real-world coordinates because of the huge numbers, compared to
the small coordinates in their own system.

So, I would not even try to fix this, but instead ask those guys to stop
scratching their balls and better send you proper real-world data and
tell you which CRS they are in . The handling of this "data" is
punishment enough afterwords.

Hope my dislike for this "technology" was not too obvious ;)

Cheers,

Bernd




On 2021-11-21 9:07 a.m., Greg Troxel wrote:

Boaz Bar Ilan writes:


i always have problem importing dwg or dxf .  the layers  dont fit the
coardinations and even when i set the layers crs it doesnt work.

I am far from an expert, but recently tried to deal with a dwg.

My impression is that they are almost always in local coordinates, and
the path to success is something like using GeoScience plugin to define
a local CRS based on control points where you know global coordinates
and local, and then to use that CRS for the data.

I recently imported some "PNEZD" data (csv with point it, northing,
easting, vertical, and description, all in an unspecified local grid,
from a total station data collector) and used geoscience to align it
wtih RTK obsservations of a few points, and things fit quite well.

How are you getting dwg?  Are you using the proprietary dwg library with
gdal, or is there some open source path?

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Re: [Qgis-user] generating contours from point elevation data

[Bernd Vogelgesang]

On 15.10.21 17:00, Firstname Lastname wrote:

  i have imported several elevation model files into qgis.  they come in as
x,y,z, elevation points.  The original files are of the type:  GDBINDEXES,
GDBTABLE FILE, GDBTABLX, and SPX.  can someone help me with a workflow for
gridding and contouring these elevation files so that they look like either
a contoured topo map or density contoured DEM.   i am able to import the
points but need some help with the contouring



Plugins might be your friend:

https://plugins.qgis.org/search/?q=contour


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Re: [Qgis-user] Update attribute of road segment when it has been surveyed

[Bernd Vogelgesang]

There is also the "Join attributes by nearest" in the toolbox.

As it is not clear how your data looks alike, its hard to guess the
right approach.

On 27.09.21 15:26, Roland Spielhofer wrote:

Hi,
I have a road network that is surveyed for road distress.
The network is a line vector layer.
I also have a point layer representing the driven trajectories of the survey
vehicle.
I am looking for a method to update a field of the network layer when [some]
points of the trajectory are "near" the line.
As the trajectory is quite precise, the distances between lines and points are
small and there are no obvious outliers.
What I don't have is the algorithm how to classify the lines if the points of
the trajectory are near the line.
Any help appreiciated!
Roland

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Re: [Qgis-user] Open-sky network

[Bernd Vogelgesang]

ohne jetzt selber eine Ahnung von Python zu haben:

Von den Pfadangaben im Originalscript und den Bilder würde ich sagen,
dass das ganze ein Beispiel in Linux ist.

Und dort ist es ganz normal, Scripte im Terminal auszuführen (was dort
auch passiert). Das hat nichts mit der Python-Konsole in QGIS zu tun.
Das Skript soll permanent im Terminal im Hintergrund laufen, um die
csv-Datei zu erstellen und neu zu überschreiben.

Erst danach kommt QGIS überhaupt ins Spiel, in dem man es mit der
csv-Datei verbindet, und dessen Änderungen nachverfolgt.

Habe selber seit Jahren kein Windows mehr in der Hand gehabt (zumindest
nicht für Spielereien), weswegen ich dir nicht mal sagen kann, wie das
ganze äquivalent in Windows funktioniert (cmd.exe?)


Viel Erfolg,

Bernd

On 13.09.21 17:12, Nils Schneekloth wrote:

Moin, ich wollte Open-sky- Daten in Qgis visualisieren. Dazu habe ich versucht, 
den Ablauf von 
https://www.geodose.com/2020/09/realtime%20live%20data%20visualization%20qgis.html
 nachzustellen. Nun muss ich dazu sagen, dass ich von Python keine Ahnung habe 
und das auch nur eine ergebnisoffene Spielerei ist. Ich habe mir folgenden Code 
von der oben genannten Seite kopiert, eine *. Csv- Datei erstellt und in Zeile 
16 den Pfad zu der Csv- Datei in das Script eingefügt:
#'''
#LIVE AIR DATA TRAFFIC REQUEST
#by ideagora geomatics | www.geodose.com | @ideageo
#'''
#IMPORTING LIBRARIES
import requests
import json
import csv
import time

#AREA EXTENT COORDINATE GCS WGS84
lon_min,lat_min=-125.974,30.038
lon_max,lat_max=-68.748,52.214

#CSV OUPUT PATH
csv_data='C:\Users\nschn\Documents\geodaten\Qgis\Flightdata\data.csv'

#REST API QUERY
user_name=''
password=''
url_data='https://'+user_name+':'+password+'@opensky-network.org/api/states/all?'+'lamin='+str(lat_min)+'='+str(lon_min)+'='+str(lat_max)+'='+str(lon_max)
col_name=['icao24','callsign','origin_country','time_position','last_contact','long','lat','baro_altitude','on_ground','velocity',
'true_track','vertical_rate','sensors','geo_altitude','squawk','spi','position_source']

#REQUEST INTERVAL
if user_name !='' and password !='':
 sleep_time=5
else:
 sleep_time=10

#GET DATA AND STORE INTO CSV
while col_name !='':
 with open(csv_data,'w') as csv_file:
 
csv_writer=csv.writer(csv_file,delimiter=',',quotechar='"',quoting=csv.QUOTE_ALL)
 csv_writer.writerow(col_name)
 response=requests.get(url_data).json()

 try:
 n_response=len(response['states'])
 except Exception:
 pass
 else:
 for i in range(n_response):
 info=response['states'][i]
 csv_writer.writerow(info)
 time.sleep(sleep_time)
 print('Get',len(response['states']),'data')

Anschließend habe ich das Script mit der Python- Konsole geöffnet. Es 
erscheinen mehrere Fehlermeldungen, die mir nichts sagen.

2021-09-13T16:42:51 WARNINGTraceback (most recent call last):
   File 
"C:/PROGRA~1/QGIS3~1.16/apps/qgis-ltr/./python\console\console.py", line 653, 
in runScriptEditor
   self.tabEditorWidget.currentWidget().newEditor.runScriptCode()
   File 
"C:/PROGRA~1/QGIS3~1.16/apps/qgis-ltr/./python\console\console_editor.py", line 
451, in runScriptCode
   if self.syntaxCheck():
   File 
"C:/Users/nschn/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\bettereditor\customclasses.py",
 line 49, in syntaxCheck
   return check_syntax(self, filename, fromContextMenu)
   File 
"C:/Users/nschn/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\bettereditor\indicatorsutils.py",
 line 33, in check_syntax
   if eline not in editor.bufferMarkerLine:
  AttributeError: 'Editor' object has no attribute 
'bufferMarkerLine'

Kann mir eventuell jemand sagen, was ich falsch mache?

Ich arbeite mit Windows 10, 64 bit und QGIS 3.16.7





Nils Schneekloth
Ohldörp 81 - 24783 Osterrönfeld
Fon: +49 4331 6646278
Mobil: 0151 20332942
Email: n.schneekl...@k-fo.de




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Re: [Qgis-user] Projecting a Layer Correctly

[Bernd Vogelgesang]

your layer is displayed perfectly with EPSG 3857 (Web mercator)

On 30.08.21 18:49, Jonah Bass wrote:

Hello,

I am having trouble projecting a layer into QGIS. I am looking to map a set
of electric substations in Spain. When I originally created the shapefile
of the substations, it projected correctly. I had to make some additions to
the list of substations and had to reload the file into QGIS. Since then,
the layer shows up to the west of Spain in the Atlantic Ocean. The shape of
the layer makes sense, but it will not project correctly. Please see the
.csv attached. Any help or suggestions to fix this would be greatly
appreciated.

Thank you,
Jonah Bass


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Re: [Qgis-user] How to make a table in a subsection report

[Bernd Vogelgesang]

I only faintly remember making a report last year with a similar problem
(maps of photo destinations on different sections of a highway).

I think I solved it by adding new columns of combined indices with the
subsection (your grid) and the photo-id, because there way no way to do
this within the report.

Haven't touched the tool since then, cause every redecision on how to
design the report lead to a complete new start from scratch, which took
too much time.

Not sure if it hits your problem. As I said, can't remember well.

Good luck,

Bernd

On 18.08.21 08:53, Dario wrote:

Hi, I have a report with a primary dynamic section where I have a map with a 
controlled layer (indexed grid). Inside each map I have points (sometime one, 
sometime more).

I need to make a subsection with these points (each point has the same indexed 
grid name, so I can maintain the same order of the map).
The issue is it is requested to make two table (form) for each page and I don’t 
know if it is possible or not. I mean... what’s happen when I have only one 
table and how it recognise the sequence between first and second item in the 
same page?

Sorry if I was not so clear...

Thank you in advance for your help

Cheers

_
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Re: [Qgis-user] 3.20.1 fails on Linux Mint

[Bernd Vogelgesang]

On 21.07.21 16:37, Fernando M. Roxo da Motta wrote:

On Wed, 21 Jul 2021 07:02:37 -0600, Richard Greenwood
 wrote:



I just upgraded from 3.20.0 to 3.20.1 on Linux Mint 20.1. Qgis doesn't
start, or more accurately, I don't get a GUI interface. I can see the
qgis.bin process running and using 100% of one core, so I guess it's
hung. I uninstalled, reinstalled, rebooted, same result. Suggestions?



   I have just upgraded Qgis in my Ubuntu 20.04.2 LTS and got the same
result, no GUI.

   There are many messages like:

(qgis.bin:62147): Gtk-WARNING **: 11:17:36.524: Theme parsing error:
gtk.css:28:35: Junk at end of value for background-color

or

(qgis.bin:62147): Gtk-WARNING **: 11:17:36.546: Theme parsing error:
gtk-widgets-assets.css:108:32: The style property
GtkWidget:separator-width is deprecated and shouldn't be used anymore.
It will be removed in a future version

But I think that is not the problem here.

   I am still struggling trying to get some clue.




   Roxo


Thanks for the warnings!

I forward it to the developer list.

Cheers,

Bernd

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Re: [Qgis-user] install freewat

[Bernd Vogelgesang]

better report your problems here https://gitlab.com/freewat/freewat/-/issues

On 02.07.21 22:24, TADE Chouaïb wrote:

Yes I installed for qgis 2.18, it didn't install very well.

Le ven. 2 juil. 2021 à 20:54, Bernd Vogelgesang 
a écrit :


seems this plugin only exists for QGIS 2.x
On 02.07.21 20:35, TADE Chouaïb wrote:

Good evening. I need your help to install the freewat plugin. when  i
download, the installation  is not completed. It said the plugin is
spoiled. I will be very happy to read your answer.



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Re: [Qgis-user] install freewat

[Bernd Vogelgesang]

seems this plugin only exists for QGIS 2.x

On 02.07.21 20:35, TADE Chouaïb wrote:

Good evening. I need your help to install the freewat plugin. when  i
download, the installation  is not completed. It said the plugin is
spoiled. I will be very happy to read your answer.


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Re: [Qgis-user] Hardware comparisons

[Bernd Vogelgesang]

I'm not sure what you mean by RAM hungry. When I fire up QGIS with no 
plug-ins on my Linux Mint, the RAM consumption goes up from 1,2 GB to 
1,4GB of 16 GB available. What happens after should be completely user- 
, use case and data-depended, I guess.



Cheers,

Bernd

On 15.06.21 17:45, Paul Wittle wrote:

Hi,

We were doing some testing for using GIS applications as RemoteApp solutions 
today and I noticed that QGIS seems to be pretty RAM hungry compared with say 
MapInfo. Does anyone know if there are any good summaries available showing the 
differences in RAM/CPU use comparing all the big ones (i.e. QGIS, MapInfo, 
ArcMap etc)?

Also, is it possible to set a limit on the total RAM QGIS can use in the 
settings? Is it the cache size?

Thanks in advance,
Paul
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[Qgis-user] QField: Synchronization .. what am I missing?

[Bernd Vogelgesang]

Hi folks,

I am already using QField in die field, but I happen not to get the
point about the synchronization.

When I'm back in the office, I copy my edited gpkg of a simple point
layer into the "import" folder in the QField folder on my computer.

Then I click the button "Synchronize with QField", the path is set to
the import folder,  and ... well .. nothing happens.

There should be new points now, but there aren't.

I simply don't get the point. Of course I could just replace the old
gpkg in my project with the new one, but what is that button good for then?


Any hints appreciated

Cheers,

Bernd

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Re: [Qgis-user] Draw Ellipse/Polygons for areas of maximum concentration

[Bernd Vogelgesang]

As you mention degree as unit for the distance, I assume that you are
working with unprojected data. 1 degree is a huge distance, so
consequently, all points will fall into this area and form one cluster.

You'll have to project your data and find some meaningful value for the
distance to get different clusters.

On 30.04.21 02:02, krishna Ayyala wrote:

Nyall,
Thanks for your reply. I have used the "dbscan clustering". In this, the
default values for "Minimum Cluster Size" is 5 and Max distance between
cluster points is 1 degrees. I ran with the same default values. I am
getting output with the layer name "Clusters". This has generated a new
field "Cluster_ID". All the points have same Cluster_ID i.e. 1. This has
also generated new field called "Cluster_Size". All the points have same
cluster size i.e. 1699. Can you please help me on how to get 4 different
cluster ID's.

Regards.

On Thu, Apr 29, 2021 at 4:29 PM Nyall Dawson  wrote:



On Fri, 30 Apr 2021 at 08:25, krishna Ayyala 
wrote:


Chris,
Thanks for the reply. Yes, I did run k-means clustering for 4 clusters.
It is creating a new layer called "clusters". This layer has a field called
Cluster_id, ranging from 1 to 4. But, this method is considering all the
points within the circle. I am looking for the points outside the ellipses
to be omitted (should not be considered)


In this case "dbscan clustering" is more appropriate.



. Also K-means clustering is not generating any polygons/ellipses. We
have to identify a cluster based on the Cluster_ID. I am curious if there
is any tool within Qgis that can produce results similar to the circle with
ellipses?


What you could do is dissolve the points based on the cluster_id field,
and then generate convex (or concave) hulls enclosing each set of points.
You won't get ellipses, but you'll get polygons describing the boundaries.
(And it would be relatively straightforward to wrap up these steps into a
single graphical model so that you have one tool which gives the desired
output!).

Nyall





Regards.

On Thu, Apr 29, 2021 at 3:56 PM chris hermansen 
wrote:


Krishna and list,

On Thu, Apr 29, 2021 at 2:51 PM krishna Ayyala 
wrote:


Hello,
I have a circle in which there are randomly distributed points as
below. Each point is a customer.

[image: image.png]


Is there a tool within QGIS that can automatically generate four
polygons or four ellipses such as below. These polygons are the areas of
maximum concentration of the customers?

[image: image.png]

You could try k-means clustering


https://docs.qgis.org/3.4/en/docs/user_manual/processing_algs/qgis/vectoranalysis.html#k-means-clustering

--
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.


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Re: [Qgis-user] Is QGIS suitable for...

[Bernd Vogelgesang]

Hi Andreas,

apart from using QuickMapServices for the background layers (use e.g.
the OpenTopoMap layer), I would recommend to get yourself aquainted to
the openstreetmap data collection.

Besides the names of towns, villages etc, they also hold, depending on
the people mapping the area, names of deserted medieval
villages(abandoned:place=village) or field names (place=locality).
Downloading this data, you can not only search for names manually, but
also use from simple to advanced techniques to filter for parts of names
or similar names.

There are some plugins for OSM: OSM place search for searching place
names, QuickOSM for downloading any kind of pre-filtered openstreetmap data.

Cheers,

Bernd


On 17.04.21 12:36, Nicolas Cadieux wrote:

Hi,

Yes, QGIS can do all of that but you will need to find the data as QGIS is a 
software only. Some maps can be downloaded from web based servers (ex:wms 
services).

Some plugins like quickmap can be easily installed from QGIS and can give you 
good base maps.  You will need to find data for your area of interest.  Many 
countries, cities or states offer data that can be downloaded for free.

Nicolas Cadieux
https://gitlab.com/njacadieux


Le 17 avr. 2021 à 04:41, Andreas Sichelstiel  a écrit :

Good day dear list members,

I was made aware of QGIS, that the program would be suitable for my
purposes.
However, before I familiarize myself with the program I would like to
ask whether what I have in mind is basically possible at all.

I (historical researcher from Germany) need a map program:
1.
To search for places or parts of place names in a certain area. The
found places should all be able to be drawn in the map.
2.
To measure distances.
3.
Topographic information must be displayable.

I use so far the outdated map software TOP50 from Germany. However, this
program cannot solve some minor problems satisfactorily.

I would be very pleased if you could give me a (short) assessment. If,
or with which plugins, I can achieve my goals.

Thank you very much for taking the time to help a complete layman. Since
I do not know if the translation program has always translated correctly
here my question in German.

Many greetings,


-


Schönen guten Tag liebe Listenmitglieder,

ich wurde auf QGIS aufmerksam gemacht, das das Programm für meine Zwecke
geeignet wäre.
Bevor ich mich jedoch in das Programm einarbeite möchte ich gerne Fragen
ob das was mir vorschwebt grundsätzlich überhaupt möglich ist.

Ich (Geschichtsforscher aus Deutschland) brauche ein Landkartenprogramm:
1.
Um Orte oder Teile von Ortsnamen in einem bestimmten Bereich zu suchen.
Die gefundenen Orte sollen alle in der Karte gezeichnet werden können.
2.
Messen von Entfernungen.
3.
Topografische Informationen müssen darstellbar sein.

Ich benutze bisher die veraltete Landkartensoftware TOP50 aus
Deutschland. Einige Kleinigkeiten kann dieses Programm aber nicht
zufriedenstellend lösen.

Ich würde mich sehr freuen, wenn Sie mir eine (kurze) Einschätzung geben
könnten. Ob, oder mit welchen Plugins, ich meine Ziele erreichen kann.

Herzlichen Dank, dass Se sich die Zeit nehmen einen absoluten Laien
weiter zu helfen.









--
Andreas Sichelstiel

Irlbach 3a
92256 Hahnbach
Tel: 09664/9546556
Fax: 03222/8352001
a.sichelst...@gmx.de
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Re: [Qgis-user] background data

[Bernd Vogelgesang]

https://gis.stackexchange.com/a/164598


On 15.04.21 20:23, Cassia Pahim wrote:

Hello! I am searching for data of a background map where I can show my layers 
on the east coast of Canada and US. I would like a background with the names of 
the cities and not a satellite image. Do you guys know where I could find that 
kind of data? Thanks a lot!!

Cassia




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Re: [Qgis-user] Editing attribute tanle

[Bernd Vogelgesang]

Hi Paddy,

you have to understand the concept, that attributes of a feature have
noting to do with its geometry.

The attributes table can hold any kind of information, in case of point
layer of course its coordinates as well, but those values will not
change when you change the geometry nor vice versa They are simply some
numbers filled into that table.

So you could e.g. drag the wrong positioned points to their correct
locations (node tool) and then fill in the coordinates via the field
calculator ($y and $x, see the documentation), but this is more or less
only "cosmetic" as this information is in most cases not really helpfull.

In case of towns, there is actually no such thing as a "correct"
coordinate of a representing point, or it is at least pseudo-correct.

Cheers,

Bernd


On 11.04.21 19:28, Pat Brown wrote:

Hi
 I am having a problem with changing co-ordinate in my attribute table.
I am using QGIS 3.18 on WIN 97,so far without any issues.
It is a point layer with towns and their co-ordinates. Three of these
data points had empty co-ordinate records and they displayed way out of
position. This was already a mystery as I couldn't figure out how it could
display without these. I then filled in the correct co-ordinates but the
points are still displaying incorrectly.
Then I noticed that on the "identify feature" panel there is a subunit
called (Derived) and it says (clicked coordinate X and Y). How do I edit
this or get rid of this?

Many thanks,

Paddy


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Re: [Qgis-user] First steps with 3D Scan Data?

[Bernd Vogelgesang]

... PLY ... OBJ ... CloudCompare ... MeshLab ... noted!

Thanks for all the input!

Bernd

On 26.03.21 11:23, Benjamin Ducke wrote:

Hi Bernd,

.rwcx is the proprietary point cloud output format
of Trimble terrestrial laser scanners.

I am not aware of any open source software that
can read this format. Your best chance for pointers
to software that can handle this format would be
a CAD/BIM or laser scanning forum.

Once you have managed to convert this to something
that is more interoperable (PLY or OBJ, for example),
your next stops should be CloudCompare and/or MeshLab
(the latter is extremely powerful but takes a lot of
time to get used to).

Best,

Ben

On 25/03/2021 22:07, Bernd Vogelgesang wrote:

Hi folks,

in a project on a former dumpside now to be transformed into a sand
lizard habitat, I saw the chance to get my hands dirty for the first
time on 3D scan data (terrestrial). I received 10GB of stuff, and now
I'm completely lost.

The data consists of .rwcx files, .tzf files and lots of other stuff.

Is there any chance that I can process any of this data with an open
source stack?
Or what should be done, to make them digestible?

Second step: There seem to be 32 different scans of the area form all
angles. In case I succeed to somehow load the data, how do I combine
them ?

For the first steps, I actually "only" would like to generate a decent
DEM from the data to be able to place some features on a map for the
guys in charge to do the habitat stuff.

Any kind of hints or links to reads about this topic would be
appreciated

Cheers,

Bernd


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Re: [Qgis-user] First steps with 3D Scan Data?

[Bernd Vogelgesang]

Hi Richard,

wow, this is amazing stuff in the video!

For the type of things I am doing, this solution would be quit sufficient.
I think the data I received is way too detailed, but I'll try to get in
touch and ask them to convert it to .las if possible.

Thanx a lot for all the hints!

Bernd

On 26.03.21 10:38, Richard McDonnell wrote:

Hi,
If you are looking for an Opensource  Pointcloud Stack, have a look at this 
video on youtube by Klas Karlsson

https://www.youtube.com/watch?v=pe04m-gHM-M=1180s

To make the above work for you , you would have needed to receive the scan data 
in LAS format, it would appear that the rcwx files are proprietary format from 
Trimble, and are Trimble RealWorks Project files. The Pointcloud data is in the 
.tzf files Can you ask the provider of the data to export the scan data as a 
LAS Format File? You should then be able absorb the data into an Open Source 
Stack i.e.Cloud Compare and QGIS 3.18

Hope that’s of some guidance and help.
Regards,

Richard.






——
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FRM Data Management

——
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Office of Public Works

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FRM Data Management

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-Original Message-
From: Qgis-user  On Behalf Of Bernd 
Vogelgesang
Sent: 26 March 2021 08:01
To: info ; qgis-user 
Subject: Re: [Qgis-user] First steps with 3D Scan Data?

Hi Benoit,

as I was not present when the scans were made, I can only assume that this was 
a laser scanner on a tripod.

With the sent data, there is a Trimble Scan Explorer Viewer software where I can make a 
"virtual walk" through the scene, so there have to be photos but also laser 
scan data as I can see from different view modes.

As I said, this is the very first time I get in touch with this stuff, and 
Google was of no big help so far.

Besides of tons of other files, the bigger ones with around 50 to 80 MB are 
.rwcx and .tzf files.
I hoped that someone would know what these file explicitly hold, and what I 
have to do to get them e.g. into QGIS or other open source software.

Cheers,

Bernd

On 26.03.21 08:40, info wrote:

Hi Bernd,

Well, could you give more info? E.g. what kind of scan:
laser/lidar/photo/other? This will influence your workflow.

+/-Open source laser/lidar could be based on lastools [1]
Open source photogrammetry could be based on AliceVision meshroom
[2,3],  MeshLab [4] and blender [5]

In photogrammetry: Agisoft metashape [6] and pix4D [7] as good
commercial products.

BTW: 32 scans, if photos, is quite a very low number of photos for
reconstructing a 3D scene!

Hope this helps.
Cheers,
Benoit de Cabissole

[1] http://lastools.org/
[2] https://alicevision.org/#photogrammetry
[3] https://github.com/alicevision/meshroom
[4] https://www.meshlab.net/
[5] https://www.blender.org/
[6] https://www.agisoft.com/
[7] https://www.pix4d.com/



On 25/03/2021 23:07, Bernd Vogelgesang wrote:

Hi folks,

in a project on a former dumpside now to be transformed into a sand
lizard habitat, I saw the chance to get my hands dirty for the first
time on 3D scan data (terrestrial). I received 10GB of stuff, and now
I'm completely lost.

The data consists of .rwcx files, .tzf files and lots of other stuff.

Is there any chance that I can process any of this data with an open
source stack?
Or what should be done, to make them digestible?

Second step: There seem to be 32 different scans of the area form all
angles. In case I succeed to somehow load the data, how do I combine
them ?

For the first steps, I actually "only" would like to generate a
decent DEM from the data to be able to place some features on a map
for the guys in charge to do the habitat stuff.

Any kind of hints or links to reads about this topic would be
appreciated

Cheers,

Bernd


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Re: [Qgis-user] First steps with 3D Scan Data?

[Bernd Vogelgesang]

Hi Magnus,

why not pdal? Cause so far I had no clue about it. And after a short
look at the link, I still have none ;) But its a start.

Thanx,

Bernd

On 26.03.21 10:23, Karl Magnus Jönsson wrote:

Hi!
Lots of suggestions here. But if I understand you correct it is lidar data and 
all about photogrammetry is not in question. Why not pdal? Open source, 
powerful and what QGIS is using in 3.18.

https://pdal.io/

Karl-Magnus


-Ursprungligt meddelande-
Från: Qgis-user  För Bernd Vogelgesang
Skickat: den 26 mars 2021 09:35
Till: Benoit de Cabissole ; qgis-user 

Ämne: Re: [Qgis-user] First steps with 3D Scan Data?

Hi Benoit,

ok, thanks. las then.

But when I read about the lastools plugin, the description says that I need to 
install the lastools software, and the website there tells me that the license 
is about 1500€ which is a little too much for some learning efforts.

Any other options?

Cheers,

Bernd


On 26.03.21 09:28, Benoit de Cabissole wrote:

Hi Bernd,

OK, that more info!

The files are likely to be in Timble RealWorks format.
So you will have to get your contractor to provide you with .las
files, otherwise your stuck buying RealWorks!
Or, perhaps, the viewer is able to export in .las??

When you get las files, you can use lastools plugin for QGIS to
process them.

Cheers,
Benoit


On 26/03/2021 10:01, Bernd Vogelgesang wrote:

Hi Benoit,

as I was not present when the scans were made, I can only assume that
this was a laser scanner on a tripod.

With the sent data, there is a Trimble Scan Explorer Viewer software
where I can make a "virtual walk" through the scene, so there have to
be photos but also laser scan data as I can see from different view modes.

As I said, this is the very first time I get in touch with this
stuff, and Google was of no big help so far.

Besides of tons of other files, the bigger ones with around 50 to 80
MB are .rwcx and .tzf files.
I hoped that someone would know what these file explicitly hold, and
what I have to do to get them e.g. into QGIS or other open source
software.

Cheers,

Bernd

On 26.03.21 08:40, info wrote:

Hi Bernd,

Well, could you give more info? E.g. what kind of scan:
laser/lidar/photo/other? This will influence your workflow.

+/-Open source laser/lidar could be based on lastools [1]
Open source photogrammetry could be based on AliceVision meshroom
[2,3],  MeshLab [4] and blender [5]

In photogrammetry: Agisoft metashape [6] and pix4D [7] as good
commercial products.

BTW: 32 scans, if photos, is quite a very low number of photos for
reconstructing a 3D scene!

Hope this helps.
Cheers,
Benoit de Cabissole

[1] http://lastools.org/
[2] https://alicevision.org/#photogrammetry
[3] https://github.com/alicevision/meshroom
[4] https://www.meshlab.net/
[5] https://www.blender.org/
[6] https://www.agisoft.com/
[7] https://www.pix4d.com/



On 25/03/2021 23:07, Bernd Vogelgesang wrote:

Hi folks,

in a project on a former dumpside now to be transformed into a sand
lizard habitat, I saw the chance to get my hands dirty for the
first time on 3D scan data (terrestrial). I received 10GB of stuff,
and now I'm completely lost.

The data consists of .rwcx files, .tzf files and lots of other stuff.

Is there any chance that I can process any of this data with an
open source stack?
Or what should be done, to make them digestible?

Second step: There seem to be 32 different scans of the area form
all angles. In case I succeed to somehow load the data, how do I
combine them ?

For the first steps, I actually "only" would like to generate a
decent DEM from the data to be able to place some features on a map
for the guys in charge to do the habitat stuff.

Any kind of hints or links to reads about this topic would be
appreciated

Cheers,

Bernd


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Re: [Qgis-user] First steps with 3D Scan Data?

[Bernd Vogelgesang]

Hi Benoit,

ok, thanks. las then.

But when I read about the lastools plugin, the description says that I
need to install the lastools software, and the website there tells me
that the license is about 1500€ which is a little too much for some
learning efforts.

Any other options?

Cheers,

Bernd


On 26.03.21 09:28, Benoit de Cabissole wrote:

Hi Bernd,

OK, that more info!

The files are likely to be in Timble RealWorks format.
So you will have to get your contractor to provide you with .las files,
otherwise your stuck buying RealWorks!
Or, perhaps, the viewer is able to export in .las??

When you get las files, you can use lastools plugin for QGIS to
process them.

Cheers,
Benoit


On 26/03/2021 10:01, Bernd Vogelgesang wrote:

Hi Benoit,

as I was not present when the scans were made, I can only assume that
this was a laser scanner on a tripod.

With the sent data, there is a Trimble Scan Explorer Viewer software
where I can make a "virtual walk" through the scene, so there have to be
photos but also laser scan data as I can see from different view modes.

As I said, this is the very first time I get in touch with this stuff,
and Google was of no big help so far.

Besides of tons of other files, the bigger ones with around 50 to 80 MB
are .rwcx and .tzf files.
I hoped that someone would know what these file explicitly hold, and
what I have to do to get them e.g. into QGIS or other open source
software.

Cheers,

Bernd

On 26.03.21 08:40, info wrote:

Hi Bernd,

Well, could you give more info? E.g. what kind of scan:
laser/lidar/photo/other? This will influence your workflow.

+/-Open source laser/lidar could be based on lastools [1]
Open source photogrammetry could be based on AliceVision meshroom
[2,3],  MeshLab [4] and blender [5]

In photogrammetry: Agisoft metashape [6] and pix4D [7] as good
commercial products.

BTW: 32 scans, if photos, is quite a very low number of photos for
reconstructing a 3D scene!

Hope this helps.
Cheers,
Benoit de Cabissole

[1] http://lastools.org/
[2] https://alicevision.org/#photogrammetry
[3] https://github.com/alicevision/meshroom
[4] https://www.meshlab.net/
[5] https://www.blender.org/
[6] https://www.agisoft.com/
[7] https://www.pix4d.com/



On 25/03/2021 23:07, Bernd Vogelgesang wrote:

Hi folks,

in a project on a former dumpside now to be transformed into a sand
lizard habitat, I saw the chance to get my hands dirty for the first
time on 3D scan data (terrestrial). I received 10GB of stuff, and now
I'm completely lost.

The data consists of .rwcx files, .tzf files and lots of other stuff.

Is there any chance that I can process any of this data with an open
source stack?
Or what should be done, to make them digestible?

Second step: There seem to be 32 different scans of the area form all
angles. In case I succeed to somehow load the data, how do I combine
them ?

For the first steps, I actually "only" would like to generate a decent
DEM from the data to be able to place some features on a map for the
guys in charge to do the habitat stuff.

Any kind of hints or links to reads about this topic would be
appreciated

Cheers,

Bernd


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Re: [Qgis-user] First steps with 3D Scan Data?

[Bernd Vogelgesang]

Hi Benoit,

as I was not present when the scans were made, I can only assume that
this was a laser scanner on a tripod.

With the sent data, there is a Trimble Scan Explorer Viewer software
where I can make a "virtual walk" through the scene, so there have to be
photos but also laser scan data as I can see from different view modes.

As I said, this is the very first time I get in touch with this stuff,
and Google was of no big help so far.

Besides of tons of other files, the bigger ones with around 50 to 80 MB
are .rwcx and .tzf files.
I hoped that someone would know what these file explicitly hold, and
what I have to do to get them e.g. into QGIS or other open source software.

Cheers,

Bernd

On 26.03.21 08:40, info wrote:

Hi Bernd,

Well, could you give more info? E.g. what kind of scan:
laser/lidar/photo/other? This will influence your workflow.

+/-Open source laser/lidar could be based on lastools [1]
Open source photogrammetry could be based on AliceVision meshroom
[2,3],  MeshLab [4] and blender [5]

In photogrammetry: Agisoft metashape [6] and pix4D [7] as good
commercial products.

BTW: 32 scans, if photos, is quite a very low number of photos for
reconstructing a 3D scene!

Hope this helps.
Cheers,
Benoit de Cabissole

[1] http://lastools.org/
[2] https://alicevision.org/#photogrammetry
[3] https://github.com/alicevision/meshroom
[4] https://www.meshlab.net/
[5] https://www.blender.org/
[6] https://www.agisoft.com/
[7] https://www.pix4d.com/



On 25/03/2021 23:07, Bernd Vogelgesang wrote:

Hi folks,

in a project on a former dumpside now to be transformed into a sand
lizard habitat, I saw the chance to get my hands dirty for the first
time on 3D scan data (terrestrial). I received 10GB of stuff, and now
I'm completely lost.

The data consists of .rwcx files, .tzf files and lots of other stuff.

Is there any chance that I can process any of this data with an open
source stack?
Or what should be done, to make them digestible?

Second step: There seem to be 32 different scans of the area form all
angles. In case I succeed to somehow load the data, how do I combine
them ?

For the first steps, I actually "only" would like to generate a decent
DEM from the data to be able to place some features on a map for the
guys in charge to do the habitat stuff.

Any kind of hints or links to reads about this topic would be
appreciated

Cheers,

Bernd


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[Qgis-user] First steps with 3D Scan Data?

[Bernd Vogelgesang]

Hi folks,

in a project on a former dumpside now to be transformed into a sand
lizard habitat, I saw the chance to get my hands dirty for the first
time on 3D scan data (terrestrial). I received 10GB of stuff, and now
I'm completely lost.

The data consists of .rwcx files, .tzf files and lots of other stuff.

Is there any chance that I can process any of this data with an open
source stack?
Or what should be done, to make them digestible?

Second step: There seem to be 32 different scans of the area form all
angles. In case I succeed to somehow load the data, how do I combine them ?

For the first steps, I actually "only" would like to generate a decent
DEM from the data to be able to place some features on a map for the
guys in charge to do the habitat stuff.

Any kind of hints or links to reads about this topic would be appreciated

Cheers,

Bernd


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Re: [Qgis-user] Challenges

[Bernd Vogelgesang]

Hi,

I think its not a good idea to have a filename like this with a dot at
the beginning:

._MLI_adm0.shp

On 24.03.21 14:37, Oumar Traore wrote:

Good morning again sir

If I want to add a Vector Layer, the message below comes out.

*Source de données non valide :
*C:\Users\USER\Desktop\GIS_Mali_Materiels\MLI_adm\._MLI_adm0.shp
n'est pas une source de données valide ou reconnue

Thank you for your time


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Re: [Qgis-user] Raster Layer Symbology Problem

[Bernd Vogelgesang]

Without testing I would say it's a bug. Quite some bugs went into 3.18
unnoticed and unfortunately, it's not  communicated on the landing page.
Next regular point release will be in 10 days, but for urgent stuff, you
should better use 3.16.


On 09.03.21 13:32, Martin Bittens wrot:

Hello QGIS User List, i

I already sent this message but it was not posted, so it is here again.
Hopefully it works now.


I am still struggling with the problem creating a legend for a raster
layer. Usually I am working with the following settings in order to
colorize a calculated raster layer (e.g. after applying v.surf.idw on a
point data set):

- rendering type: singleband pseudocolor

- interpolation: linear

- mode: equal interval


In QGIS 3.18.0:

Selecting an appropriate color ramp and applying a classification in,
e.g., 5 classes, I see in the "Layer Properties - Symbology" window the
5 colored classes separately and the corresponding 5 values (in my case
temperatures) for each color coding. But in the "Layer Panel" the legend
shows the color coding as a continuum and only the first and last value
of the value range appears. The same thing happens in the layout manager
when I create a layout for printing which includes a legend.

In QGIS 3.16.4 LTR and previous versions:

Doing the same I get the 5 color classes separately and the
corresponding values for each of the 5 classes in the "Legend Panel"as
well as in the layout manger.


My question: Is this a bug in the new QGIS version or does QGIS 3.18 not
provide this functionality anymore?


Thanks a lot for a comment.


Regards


Martin



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Re: [Qgis-user] Do GPX files contain CRS information?

[Bernd Vogelgesang]

Hi Jeremy,

as far as I can remember, the CRS of waypoints is by default EPSG 4326,
no matter what you change in the settings of the device (changes just
alter display of coordinates on the device). But I haven't touched a
garmin for ages (yuk!) and do the stuff with my phone.

Your garmin seems to be a rather old model, cause with garmins from the
last 10 years or so, there was no need to use GPSbable to import the
data, but  they just create gpx themselves.

It is quite uncommon to produce gpx files with other CRS than EPSG:4326,
so better import it into QGIS and reproject it to a new non-gpx file
format with the CRS of choice.


Hope that helps

Bernd



On 05.03.21 06:02, jeremy benwell wrote:

Hi,

I was wondering if GPX files contain CRS information? I saved some
waypoints in my garmin gps and then used GPSBabel to upload those waypoints
to my computer and create a GPX file. The map datum on my gps was set to
GDA 94. Does my GPX file contain the CRS that my GPS was set to when I
saved the waypoints (i.e. GDA 94) and if so do I need to make sure my QGIS
project CRS is set to GDA 94 also?

Any help would be much appreciated thank you!

Cheers,

Jeremy


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Re: [Qgis-user] contours and symbology

[Bernd Vogelgesang]

In case someone wants to google for the " % " later: it's called modulo
operator (damn, took me half an hour to remember that)


On 03.03.21 19:20, Sebastian Gutwein wrote:

Sorry typo: "ELEV" :The attribute field that contains your elevation

On Wed, Mar 3, 2021 at 1:19 PM Sebastian Gutwein  wrote:


I use rule based styling with this expression for my 100m contour filter
rule:
"ELEV" % 100 = 0
And then another rule that has the Else selected.
The formula is:
"ELEV" :The attribute field that contains your label
% : The remainder from division
100 : the divider
= 0 : the remainder should equal zero.
This filters all the 100m contours.

On Wed, Mar 3, 2021 at 1:01 PM Azzurra Lentini 
wrote:


Hi to all,

I have extracted contours from a dtm raster 20 m resolution file and the
result is a vector file of contours with 20 m of interval between the
contours.

I would like to have two different symbols for these contours: for
example black colour and thickness 1 for the contours with interval of 100
m (0, 100, 200, 300 etc.) and grey colour and thickness 0.5 for the
contours 20, 40, 60, 80, 120, 140 .. etc.).

What can I do?

Normally I create another contours file only for the contours equidistant
100 m and I put a different symbol for the 2 layers.

Do you know other ways without the creation of another file?
maybe rule-based symbology?


Thank you, Azzurra

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Consultant Environmental Risk Prevention and Hydrogeology
AZZURRA LENTINI
++
Italy Mobile Tel.: **(39) 338 24 40 676
++
SKYPE azzurrahydro
++

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*azzurra.lent...@uniroma3.it  *
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*n'imprimez ce mail qu'en cas d'absolue nécessité*





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Re: [Qgis-user] Problem to open Raster files

[Bernd Vogelgesang]

seems this a ESRI File Geodatabase (sorry, left the ESRI stage 10 years
ago, so not sure).

As far as I know, rasters can't be exctracted from this with QGIS.

List of supported raster formats: https://gdal.org/drivers/raster/index.html


Am 19.02.21 um 21:00 schrieb Cassia Pahim:

They are in those formats

.gdbindexes
. gdbtable
. horizon
. gdbtablx
. freelist
. atx
. spx

Cassia







Le 19 févr. 2021 à 14:58, Bernd Vogelgesang  a écrit :

could you possibly share a little more details about what type of rasters you 
are dealing with? There is a bazillion of different raster formats!

Am 19.02.21 um 20:47 schrieb Cassia Pahim:

Hello,

I am trying to create a map and I have 15 datasets that were sent to me in a 
zip folder and I can’t open them into QGIS. When using the icon « add rater 
layer » I get an error message telling me the files are not valid or 
recognized. What should I do to be able to work with those datasets ? Please 
note that I am using macOS Catalina 10.15.7 and I have installed QGIS 3.16.

I appreciate your help,

Cassia









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Re: [Qgis-user] Problem to open Raster files

[Bernd Vogelgesang]

could you possibly share a little more details about what type of
rasters you are dealing with? There is a bazillion of different raster
formats!

Am 19.02.21 um 20:47 schrieb Cassia Pahim:

Hello,

I am trying to create a map and I have 15 datasets that were sent to me in a 
zip folder and I can’t open them into QGIS. When using the icon « add rater 
layer » I get an error message telling me the files are not valid or 
recognized. What should I do to be able to work with those datasets ? Please 
note that I am using macOS Catalina 10.15.7 and I have installed QGIS 3.16.

I appreciate your help,

Cassia








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Re: [Qgis-user] file qpj non creato

[Bernd Vogelgesang]

Isn't the correct answer, that in newer versions, there is no qpj
created, cause it is not needed anymore?

Am 16.02.21 um 22:56 schrieb Nicolas Cadieux:

Hi,

I created a shp file today. I specified the CRS in the new Shapefile
Layer dialog.  The .prj was created.  I am using qgis 3.16 on Windows
10.  Did you specify the CRS?

Nicolas


"Dear users of the list
today wanting to make a comparison with some old shapefiles I created
a new one with QGIS 3.10.2 and I realized that the .qpj file is no
longer created in addition to the classic .prj.

Can anyone tell me from which version of QGIS this happens?

Antonio Valanzano"

On 2021-02-16 2:14 p.m., Antonio Valanzano wrote:

Cari utenti della lista
oggi volendo fare un confronto con alcuni vecchi shapefile ne ho
creato un nuovo con QGIS 3.10.2 e mi sono accorto che non viene più
creato il file .qpj in aggiunta al classico .prj.

Qualcuno sa dirmi da quale versione di QGIS accade ciò ?

Antonio Valanzano






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Re: [Qgis-user] Display number of features present in layer's Attribute Table

[Bernd Vogelgesang]

Hi Ann,

actually I do not fully understand what you are looking for: When you
open an attribute table, the number of features in this table is
normally displayed in the the header of this table, and in case features
are selected, the number of selected features.
Furthermore, when you right-click on a layer in the layer pannel and
choose "show feature count", you can also have the number of features
directly shown in the layers panel. In case you have a categorized
style, it even shows the counts for those categories.

So I really wonder where and for what did you look, cause for me it
seems that the things you ask for, are right in front of your eyes.

Cheers,

Bernd

Am 04.02.21 um 02:29 schrieb Ann Tulliani:

Dear list,

Is there a way to display - either at the status bar or directly within the 
Layers panel - the number of features present in the Attributes Table of each 
layer - or, at least, of the selected layer?
I have been looking for a setting or a plugin that would allow something like 
that for a while but could not find. Since that functionality would be a huge 
productivity boost for me and no solution exists already, I would also 
appreciate any hints that would put me in the right direction of implementing 
it with Python Scripts.
Best regards,

Ann Tulliani

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Re: [Qgis-user] Georeferencing a DXF file

[Bernd Vogelgesang]

Hi Walt,

though I do no have a lot of experience with CAD imports and no idea of
the idea behind CAD in general, but I learnt over the time, that doesn't
make much sense to try to make good data out of shitty data, but to
better try to convince those non-geo CAD-users to invest some time in
finding the proper export settings for their data.
I at least received already a good amount of AutoCAD files that went
into QGIS super-smooth without any problem, while from others it was
crap like yours.

So the solution is the person behind the CAD-program, and rather not to
find sophisticated import strategies.

Just my 2 cents

Bernd



Am 03.02.21 um 20:10 schrieb Walt Ludwick:


I've received a 3D AutoCAD file from an architect that i managed to convert
into 2D .dxf format and import into my QGIS project, but it is out-of-scale
and out-of-place, so i guess i need to add some georeferencing coordinates
to the file.

This should be easy enough, since it's an accurate representation of a
building that's already in the project -with an additional wing tacked on-
so i'm thinking i could just use a few corners of that existing buildings
as ground control points, and map them to the corresponding corners on this
.dxf model, then maybe all other co-ordinates could be automatically
generated by some tool, if i could just find the right one for the job.

Is there in fact any such easy way to do this thing?


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Re: [Qgis-user] File based Geopackage bugs

[Bernd Vogelgesang]

for 2. I found a "workaround":
As far as I remember, copy/paste works, but when trying to save, you get
this warning/error.

In the attribute table, I pick the "fid" column, enter "$id" and perform
"update all". After that the layer can be saved.

A novice user will never come to that solution by itself, so this a real
show stopper for gpkg.

Am 02.02.21 um 03:11 schrieb Patrick Dunford:

I recall going back someway we were sold this Geopackage idea being
implemented into Qgis because it was going to be so much better than
shape files that everyone has been using up to now. I bought into
these ideas by converting shape files in most of my Qgis projects into
Geopackage files.

However there appear to be some serious bugs in Qgis' implementation
of Geopackages as a file based system, and since SQlite has an
impeccable reputation, it is a reasonable conclusion that there must
be significant uncorrected bugs in the Qgis code that deals with file
based Geopackages.

Here are two examples:

1. Changing the data table associated with a layer, specifically the
operation of deleting columns, is almost 100% guaranteed to result in
automatic deletion of 100% of the features in the layer when the layer
is saved. I have seen this happen multiple times, whether in a layer
with 92 features or one with half a million.

2. Compared to shapefiles, Geopackages add an extra field called a fid
which is a unique numerical value. For new records, this value is
automatically generated. This requirement of uniqueness and the field
apparently being unchangeable by the end user makes it impossible to
paste features from another table if the values in the fid field for
pasted features happen to coincide with existing entries in the table.

These two examples are making me consider changing back to shapefiles
in all my projects because shapefiles did not cause either of these
two problems. Supposedly a shapefile is more prone to data corruption.
This may be the case but as the code in Qgis that deals with
shapefiles appears to be considerably more mature, these
considerations have to be reasonably weighed against each other.

Particularly in the case of issue 1, this appears to be a regression
since I do not recall it being an issue on Qgis 2.18 or possibly
earlier versions of Qgis 3. (I use the LTS edition of Qgis)

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Re: [Qgis-user] parallel, multi-colored line styles

[Bernd Vogelgesang]

a li'll more effort explaining your use-case would be appreciated


Am 27.01.21 um 20:40 schrieb Ryan Peel:


Is this possible to do in qgis for a single line feature?


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Re: [Qgis-user] Using color_rgba for symbols from field-value

[Bernd Vogelgesang]

Ah, found the problem.

Due to some other issues I did not realize, that the colours where
indeed taken from my rgb-field.
I only stared at the legend of the categorized layer, and there the
colours are still random.
Found no way to get the categories to adjust to the colours automaticly,
so it seems that I will have to do that manually again, which is a bit
 when all the rest is data-driven.

Am 20.01.21 um 19:03 schrieb Bernd Vogelgesang:

Hi Richard,

thanx for having a look. First I overlooked this option (gnrr ..), but
then, it did not work :(

My layer is a  point layer of bat species found in batboxes. To this
layer, I join a reference list via the species abbreviation to get the
latin name and the colour.

When I now use this layer to categorize the points by species and set
my rgba-field for the symbol colour, there are still random colours
applied to the categories.

Bug, feature or misinterprestation of the workflow?

Bernd

Am 20.01.21 um 18:53 schrieb Richard McDonnell:

Hi Bernd,

I have tested a little polygon dataset, adding a rgba field (as a
text string) and found that QGIS will actually use the Field type:
string option to apply the colour. Just select your rgba attribute
and it works fine.

hope that helps.

Reagrds,

Richard





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FRM Data Management

--
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Office of Public Works

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-Original Message-
From: Qgis-user  On Behalf Of
Bernd Vogelgesang
Sent: 20 January 2021 17:32
To: qgis-user 
Subject: [Qgis-user] Using color_rgba for symbols from field-value



Hi,



I would like to hard-wire the colours for categories with their
rgba-values in a field.



I have a text field named "rgba" and am searching for a way to make
this color_rgba-function working.

e.g '146,208,80,255'

It's obvious that my colour-values are an array of strings, which
need to be somehow converted to integers to be eaten by the color_rgba.



So in theory, the string '146,208,80,255' has to become an array,
probably by array("rgba"). But this array is an array of strings and
not of integers.

Does anyone know how to achive this array of integers, so the

color_rgba(somemagic("rgba") returns my colour?



Cheers,



Bernd



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Re: [Qgis-user] Using color_rgba for symbols from field-value

[Bernd Vogelgesang]

Hi Richard,

thanx for having a look. First I overlooked this option (gnrr ..), but
then, it did not work :(

My layer is a  point layer of bat species found in batboxes. To this
layer, I join a reference list via the species abbreviation to get the
latin name and the colour.

When I now use this layer to categorize the points by species and set my
rgba-field for the symbol colour, there are still random colours applied
to the categories.

Bug, feature or misinterprestation of the workflow?

Bernd

Am 20.01.21 um 18:53 schrieb Richard McDonnell:

Hi Bernd,

I have tested a little polygon dataset, adding a rgba field (as a text string) 
and found that QGIS will actually use the Field type: string option to apply 
the colour. Just select your rgba attribute and it works fine.

hope that helps.

Reagrds,

Richard





--
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

--
Oifig na nOibreacha Poibl?
Office of Public Works

Sr?id Jonathan Swift, Baile ?tha Troim, Co na M?, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
--
M +353 87 688 5964 T +353 1 647 6543
https://gov.ie/opw

--
To send me files larger than 30MB, please use the link below 
https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie

Email Disclaimer: 
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/

-Original Message-
From: Qgis-user  On Behalf Of Bernd 
Vogelgesang
Sent: 20 January 2021 17:32
To: qgis-user 
Subject: [Qgis-user] Using color_rgba for symbols from field-value



Hi,



I would like to hard-wire the colours for categories with their rgba-values in 
a field.



I have a text field named "rgba" and am searching for a way to make this 
color_rgba-function working.

e.g '146,208,80,255'

It's obvious that my colour-values are an array of strings, which need to be 
somehow converted to integers to be eaten by the color_rgba.



So in theory, the string '146,208,80,255' has to become an array, probably by 
array("rgba"). But this array is an array of strings and not of integers.

Does anyone know how to achive this array of integers, so the

color_rgba(somemagic("rgba") returns my colour?



Cheers,



Bernd



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[Qgis-user] Using color_rgba for symbols from field-value

[Bernd Vogelgesang]

Hi,

I would like to hard-wire the colours for categories with their
rgba-values in a field.

I have a text field named "rgba" and am searching for a way to make this
color_rgba-function working.
e.g '146,208,80,255'
It's obvious that my colour-values are an array of strings, which need
to be somehow converted to integers to be eaten by the color_rgba.

So in theory, the string '146,208,80,255' has to become an array,
probably by array("rgba"). But this array is an array of strings and not
of integers.
Does anyone know how to achive this array of integers, so the
color_rgba(somemagic("rgba") returns my colour?

Cheers,

Bernd

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Re: [Qgis-user] negative fid-issue with Geopackage

[Bernd Vogelgesang]

Thanks for your reply. Just after posting, I had the idea to select the
negative ones and export them seperately, and then had the same idea to
just export without fid, which produced a new fid-field with normal numbers.
I think this would have worked with the hole layer as well, but i can't
test cause i have to quickly resume with the work.

All these fid-issues with geopackages are really nothing you should let
a novice user run into!

Thanx for having a look,

Bernd

Am 12.01.21 um 16:57 schrieb qgis-u...@stripfamily.net:

what happens if you export->Save As on the layer and uncheck the fid under
"Select fields to export"?


For the file I tried this on, it created new fids.

On 1/12/2021 8:41 AM, Bernd Vogelgesang wrote:
> Hi,
>
> somehow I managed to produce a polygon layer by copying and merging
> features from other layers, where the fid of those new parts are
> negative numbers.
> The features exist, but the attribute entries are not editable, and so
> isn't the fid itself.
> Saving as a new layer just reproduces the negative fids and the behaviour.
> Like always, this issue hits me in the last production phase of a final
> map, so if anyone has an idea how to transform those non-functional
> features into normal behaving ones, I would be very grateful.
>
> Cheers,
> Bernd
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[Qgis-user] negative fid-issue with Geopackage

[Bernd Vogelgesang]

Hi,

somehow I managed to produce a polygon layer by copying and merging
features from other layers, where the fid of those new parts are
negative numbers.
The features exist, but the attribute entries are not editable, and so
isn't the fid itself.
Saving as a new layer just reproduces the negative fids and the behaviour.
Like always, this issue hits me in the last production phase of a final
map, so if anyone has an idea how to transform those non-functional
features into normal behaving ones, I would be very grateful.

Cheers,
Bernd
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Re: [Qgis-user] Problems with my design

[Bernd Vogelgesang]

Hi,

Are you sure the WMS layer is the reason for your problem? If so, you
could try to generate a mbtile (toolbox) for your area from this WMS
layer, and then use the mbtile as background and switch the WMS off.

Cheers,

Bernd

Am 20.12.20 um 05:44 schrieb Javiera Elisa Llevenes Droguett:

Hi, I've been working on some projects and the program won't let me save in 
PDF, I don't know what to do and I'm falling behind with the projects.
In a window it appears that the WMS server has a Height and width limit, what 
can I do?



Best regards,

Javiera Llévenes Droguett
Optimization Supervisor



Bayer Chile - Crop Science
Monsanto Chile S.A.
Veg LATAM Optimization Excellence
Panamericana Sur km 41,5
Paine, Chile
Cell:  +56 9 8541 8205



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[Qgis-user] A2 Atlas crashing QGIS

[Bernd Vogelgesang]

Hi,

for the first time, I run in serious trouble. I need to create A2 plots
based on oriented bounding boxes.

Activating the atlas is crashing QGIS with

qgis.bin: geos_ts_c.cpp:3927: int
GEOSCoordSeq_getOrdinate_r(GEOSContextHandle_t, const
geos::geom::CoordinateSequence*, unsigned int, unsigned int, double*):
Zusicherung »0 != cs« nicht erfüllt.

in terminal. (btw, how can I set the terminal output to english?)

Has anyone an idea what is happening there?

A3 works, but this is way too small to be able to see all the tiny
features in the layer.

Linux Mint 20, QGIS 3.16

Cheers,

Bernd



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[Qgis-user] Duplicate feature

[Bernd Vogelgesang]

Not having digitized in a while, I now stumbled upon a feature which I
neither understand/get to work nor understand/find documentation.

When right-clicking on a feature in the attribute table, there is now a
context menu with two entries:

"Duplicate feature" and "Duplicate feature and Digitize" When using the
first, a new entry is created in the attribute table, but zooming to the
feature it sais: WARNING Zoom to feature id failed : Feature does not
have a geometry

I guess that "Duplicate feature and Digitize" is handy for digitizing a
new object with the same attributes as the original one where the action
started.

But what the heck is the purpose of "Duplicate", when it only produces
an entry in the attribute table, but no geometry?

Actually I could use a reliable tool to copy a set of constructed
rectangels which I need in multiple places. "Duplicate feature " seems
not to be meant for that, right?

Cheers,

Bernd

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Re: [Qgis-user] Qgis-user Problem splitting polygons with line layer

[Bernd Vogelgesang]

Thanx guys for your input,

check validity brought up no problems, fix geometries did not help.

But, simply using the Linies to polygons tool did most of the job for me
and delivered the parcels. I then managed to split the parcels with
other lines to get the subsections.

This tool did not work at all in the past, so I completely erased it out
of my mindset. Obviously, sth changed to the better there. It's a
problem when you already work for too long with QGIS, so you stick to a
behaviour derived from the experiences in the past.

Thanks,

Bernd

On 07.12.20 23:44, Thayer Young wrote:

  Hi Bernd,
That sounds like you may have a topology problem, like self intersection.
Have you tried 'Vector Geometry': 'Fix Geometries' in the Processing Toolbox?In 
the same place there is also a 'Check validity' tool, which would find the 
problems for you and then you could fix them manually. The tool gives you 
options for different standards of validity.Another possibility is that you 
have mixed geometry types. You might be able to fix that with GRASS: v.type or 
Processing:'Vector geometry': 'Convert geometry type'
In PostGIS you would check if the imported geometry column is SELECT id FROM 
dwg_table WHERE NOT ST_IsSimple(geom)or: SELECT ST_GeometryType(geom) FROM 
dwg_table GROUP BY ST_GeometryType(geom).
-Thayer

 On Monday, December 7, 2020, 01:58:04 PM EST, qgis-user-requ...@lists.osgeo.org 
 wrote:
Date: Mon, 7 Dec 2020 19:57:19 +0100
From: Bernd Vogelgesang 
To: qgis-user 
Subject: [Qgis-user] Problem splitting polygons with line layer
Message-ID: <82a7c751-29c2-9906-25e6-903897986...@gmx.de>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Hi,

I need to split a polygon with a line layer (representing parcel
boundaries ).

Using "Split with lines", the process always stops at 12% and there is
no progress visible. The lines are imported from a CAD dwg as a
CompoundCurveZ (never had to do with this before)

My goal is to "cut" the polygon, so I retrieve parcels of a specific
area again.

With other line layers from this dwg ist no problem spliting the
polygon, only the parcel boundaries won't work.

Does anybody have an idea what could be the cause of this problem, what
I other tools I could try or if I have to proprocess the lines
beforehand with other tools?

Hoping for enlightment (and having a deadline tomorrow)

Bernd



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[Qgis-user] Problem splitting polygons with line layer

[Bernd Vogelgesang]

Hi,

I need to split a polygon with a line layer (representing parcel
boundaries ).

Using "Split with lines", the process always stops at 12% and there is
no progress visible. The lines are imported from a CAD dwg as a
CompoundCurveZ (never had to do with this before)

My goal is to "cut" the polygon, so I retrieve parcels of a specific
area again.

With other line layers from this dwg ist no problem spliting the
polygon, only the parcel boundaries won't work.

Does anybody have an idea what could be the cause of this problem, what
I other tools I could try or if I have to proprocess the lines
beforehand with other tools?

Hoping for enlightment (and having a deadline tomorrow)

Bernd


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Re: [Qgis-user] z factor

[Bernd Vogelgesang]

On 27.11.20 10:52, Raymond Nijssen wrote:

...
Last week I had a similar idea for a plugin that could tell you which
UTM zone to pick for your current canvas. I decided it would not be
worth the effort. But maybe these could go together (and be finished
at the end of this "KwakFriday"?

Isn't that already covered by the "Projestions" plugin?


Regards,
Raymond


On 27-11-2020 06:13, Nicolas Cadieux wrote:

Hi,

It's just the Z factor needed when you make a hillshade when the x an
y are in degrees and the z is in feet or meters (like SRTM). You can
see it if you choose Hillshade under symbology / render type (for a
raster layer).  It's basically the length of a degree in meters for
latitude.

https://www.esri.com/arcgis-blog/products/product/imagery/setting-the-z-factor-parameter-correctly/


Nicolas

On 2020-11-27 12:08 a.m., Richard Duivenvoorde wrote:

On 11/27/20 5:28 AM, Nicolas Cadieux wrote:

I want to learn to make a QGIS plugin and I was wondering if
anybody new if there is a QGIS plugin or tool that calculates the z
factor for a particular latitude? I thought this would be an easy
project to start with but I don't want to duplicate someone else's
work.

Hi Nicolas,

What do you mean with "calculates the z factor for a particular
latitude"?

- z-factor as in x,y,z?
- Do you mean based on a crs/datum? So more proj-based?
- Or do you mean based on a known dataset with not enough z-info? So
more extra/intrapolation?
- Raster? Vector?
- Creating a new dataset (processing)? Or just reporting for one lat
(desktop/gui)?

Just trying to get an idea of your idea :-)

Regards,

Richard Duivenvoorde




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Re: [Qgis-user] Set variables by UI

[Bernd Vogelgesang]

Without knowing more about your project than A and B, it is a guessing
game what could be best.

But to me, if I understood correctly, it sounds like you are about to
create a data-redundancy over several layers.

If those attributes are really the same, and stay the same, it would
maybe me wiser to work with relations and/or virtual layers where you
could deliver those common values without having to really store them
individually in each layer.



On 25.11.20 22:43, L.W. wrote:

That's what I want to use, but how to set the "default value" - no, not
per propertier and form builder.

I want to set the DV by input in "UI A" (add feature to layer A) and
then add new feature to B, and in UI B the DV is set to value from
form A.


Am 25.11.2020 um 21:19 schrieb Harrissou:

Hi,
Something like setting default values for field:
https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/vector_properties.html#default-values



?

Regards,
Harrissou

Le 25 novembre 2020 20:49:17 GMT+01:00, "L.W."  a
écrit :

    Hello,

    I have a question again, I know the possibility of the project
    variables, which can be queried from all layers.
    I have to insert several points and lines or polygons in
different layers.
    All inserted features have in common that they have certain
attributes
    that are the same for all.
    It would be nice if I only have to enter these common attributes
for the
    first feature and the values ​​are then automatically inserted as
    default values ​​for each new feature.
    One possible way would of course be a link to a shared data
table, but I
    don't necessarily want to go this way for reasons.
    I know the option of giving a UI a Python script when it is
opened (even
    if I can't Python), but I haven't found anything to execute a script
    after closing, for example.
    Obviously logical, you can of course set the variables
beforehand, but
    that would be another step that you have to take beforehand and you
    cannot get to these variables without a whole series of mouse
clicks.

    Any ideas?

    Regards

    Qgis-user mailing list
    Qgis-user@lists.osgeo.org
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excuser ma brièveté.



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Re: [Qgis-user] Toggle Attribute

[Bernd Vogelgesang]

other ideas after my third coffee:

Maybe you could try with a virtual layer. I'm successfully working with
them to show me the status of to be controlled items with a
geometry-less maintenance-table. But I'm pretty confident that the same
logic would work with two geometry layers

If there was the possibility to query for that is_selected() you found,
it could be possible to just show the requested item and be otherwise
invisible. I will investigate later.

Drawback on Virtual layers is, that they seem to be not very performant,
but maybe my queries are just inefficient crap, who knows.

On 23.11.20 10:29, L.W. wrote:

and there are some disadvantages ... first you have to set the layer
active to which the symbol belongs.

there is no "is_" derivat for "get object info" (i-icon with
mouse-pointer), so nothing happened if the feautre attribute-dialog is
shown, the feature is (different) highlighted but not the same way as
"selected" (by the yellow buttons with mouse-pointer).


Am 23.11.2020 um 10:06 schrieb L.W.:

I tried a little bit with "actions" but - I think you're right - there
is no onHover.

anyway, I found a much more comfortable solution for the moment.

I add the simple term "OR is_selected()" in the if clause for my symbol
to show the changed color (in my case I draw a line between two points)
and it worked like a charme.

But, this is without the option to e.g. display a messagebox or someting
like that with additional informations of the feature (I know about map
hints/tips (I do not know the right translation).

Yes you could made an action for that, but my goal was to show this on
hover, but click is okay.

For X-Mas my wish in relation to QGIS is a hover event ... on feature on
map and on symbols. ;-)

Thanks for helping to everyone.


PS: Do I have to implement a Plugin to have a dockable window for
showing infos non modal on per action selected features?


Am 23.11.2020 um 09:40 schrieb Richard Duivenvoorde:

On 11/22/20 8:40 PM, Jésahel Benoist wrote:

The actions are a standard way of acting on graphical objects, so
for me it would be the first thing to try. Did you ?

Le dim. 22 nov. 2020 à 20:01, Bernd Vogelgesang
mailto:bernd.vogelges...@gmx.de>> a écrit :

 if you would be so kind to explain the "just" part of your
proposal?

I think in the User lists it is always good to add a link to some
documentation about a QGIS-term. In this case 'actions' kan be a
normal word, but (advanced) users maybe (or not) know that it is also
something you can use to 'do something in QGIS upon a click on a
feature'.

Some documentation here:
https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#actions-menu


(or do a search on 'actions' in the QGIS docs site).
Tip: go to vector layer properties, 'Actions' tab, and hit 'Create
Default Actions' button. You will get all kind of examples.

About original post: I do not think we have an Action on hover (plz
correct me if I'm wrong), but to run some (PyQGIS) python code is
doable.
With PyQGIS you can search for features in other layers, and maybe
'select' these on click in the other layer (or change attribute,
though I'm not sure how to change it back then... )

Acutally this sounds like nice functionality for layers which have
relations... I'm not so experienced with relations in layers.

If you worked out a way to do this, plz let us know :-)

Regards,

Richard


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