Re: [Qgis-user] .csv table

[Nicolas Cadieux via QGIS-User]

Hi,
Sorry, I will not be available for another month…. Its now or never (for me 
anyways…)

Nicolas Cadieux

> Le 26 mai 2023 à 13:06, Burt Grabowski  a écrit :
> 
> 
> Hi Nicolas,
> 
> thank you for your reply. In this case my supervisor told me to use QGIS, so 
> I have no alternative. For today I'm a little bit too late, because I stop 
> working at 8:00 p.m CET. I would prefer tomorrow between 12:00 a.m and 2:00 
> p.m but your time zone is -7 hours.
> 
> Burt Grabowski
> 
> --
> Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail gesendet.
> Am 26.05.23, 18:42 schrieb Nicolas Cadieux :
>> 
>> Hi Burt! 
>> Last call! I would need to do this quickly. Hope you get this message on 
>> time! 
>> 
>> Nicolas Cadieux 
>> 
>> > Le 26 mai 2023 à 10:17, Nicolas Cadieux  a 
>> > écrit : 
>> > 
>> > Hi, 
>> > I could probably help out sometimes between noon and 1h30. When my meeting 
>> > ends. (Montréal time). Would that work? 
>> > 
>> > Nicolas Cadieux 
>> > 
>> >> Le 26 mai 2023 à 10:08, Burt Grabowski via QGIS-User 
>> >>  a écrit : 
>> >> 
>> >> 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

[Nicolas Cadieux via QGIS-User]

Hi Burt!
Last call!  I would need to do this quickly. Hope you get this message on time!

Nicolas Cadieux

> Le 26 mai 2023 à 10:17, Nicolas Cadieux  a écrit 
> :
> 
> Hi,
> I could probably help out sometimes between noon and 1h30. When my meeting 
> ends.  (Montréal time).  Would that work?
> 
> Nicolas Cadieux
> 
>> Le 26 mai 2023 à 10:08, Burt Grabowski via QGIS-User 
>>  a écrit :
>> 
>> 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] Create 3D polygons

[Nicolas Cadieux via QGIS-User]

Hi,
I’am sure there is an easier way like a cad plugin or an open source cad 
software but for very simple shapes, I have used a x,y,z wkt format in a text 
file. Google wkt format and wiki. 

Nicolas Cadieux

> Le 23 mai 2023 à 01:24, Grant Boxer via QGIS-User  
> a écrit :
> 
> 
> I am trying to create a 3D polygon using XYZ coordinates, like from vertices 
> of a rectangular prism for example, and wondered how to create this so I can 
> display is in 3D using the QGIS2Threejs or the 3D map view options in QGIS. 
> Any suggestions?
> Grant Boxer
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Re: [Qgis-user] QGIS for safe organization use.

[Nicolas Cadieux via QGIS-User]

Hi,

Your data is your data!  It will be safe if you keep it safe.  If you have any 
concerns regarding the safety of QGIS, send a mail to the NRCAN Canadian 
mapping service in Sherbrooke Quebec.  They use QGIS and other products.  
Between you and me, I would stick with QGIS as ArcGIS could lock you into 
proprietary file formats.  I would say ArcGIS is the best alternative to QGIS!

Nicolas Cadieux

> Le 23 mai 2023 à 12:10, Simon via QGIS-User  a 
> écrit :
> 
> 
> Hello, 
> 
> I work at the Department of National Defense for the Canadian government and 
> had some questions regarding QGIS. 
> 
> Firstly, I'm working on a project to determine the seismic risk and 
> vulnerability of all the department's buildings different Canadian Provinces. 
> An important part of the project will be to create a geodatabase containing 
> crucial information about each building. After, I plan to create a layer that 
> will show the location of these buildings on a map. 
> 
> Now, a large portion of the information regarding the buildings and their 
> locations is confidential, and so I'm wondering if the geodatabase and layer 
> that I plan to create will be safe and protected, or if other users will have 
> access to them since QGIS is free and open source?
> 
> At first, I was planning to work with ArcGIS Pro but I'm currently waiting 
> for a license. When or if it comes through, I'll stick with ArcGIS but for 
> now QGIS seems to be the best alternative. 
> 
> If QGIS is not safe, are there other safe and similar softwares you can 
> recommend? 
> 
> Thanks, 
> 
> Simon
> 
> 
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Re: [Qgis-user] .csv table

[Nicolas Cadieux via QGIS-User]

Hi,
I could probably help out sometimes between noon and 1h30. When my meeting 
ends.  (Montréal time).  Would that work?

Nicolas Cadieux

> Le 26 mai 2023 à 10:08, Burt Grabowski via QGIS-User 
>  a écrit :
> 
> 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] Check Geometries Plugin - attribute value in results

[Nicolas Cadieux via QGIS-User]

Hi,Just read the other posts.  I thought you were looking for a definition.Nicolas CadieuxLe 29 mars 2023 à 11:57, Nicolas Cadieux  a écrit :Hi,I believe a sliver is only defined and identified when comparing the borders of one polygon with the borders of another (same or different layers).  When borders don’t match (ex: adjacent polygon nodes don’t match) a sliver is found.  It’s my understanding anyways…Nicolas CadieuxLe 29 mars 2023 à 03:27, Totò Fiandaca via QGIS-User  a écrit :What does the real value of Sliver polygon represent?- it's not the area of the polygon- it's not the perimeter- is not the area of the bounding boxso I ask if anyone can tell me what it represents, I can't find anything useful in the documentation.https://i.imgur.com/ISs4o1E.pngPlugin: https://docs.qgis.org/3.28/en/docs/user_manual/plugins/core_plugins/plugins_geometry_checker.html#geometry-checker-plugin-- Ing. Salvatore Fiandacamobile.:+39 327.493.8955 m: pigrecoinfin...@gmail.comC.F.: FNDSVT71E29Z103GP.IVA: 06597870820membro QGIS Italia - http://qgis.it/socio GFOSS.it - http://gfoss.it/member OSGeo - https://www.osgeo.org/member/fiandaca/blog: https://pigrecoinfinito.com/ FB: Co-admin - https://www.facebook.com/qgis.it/  TW: https://twitter.com/totofiandaca43°51'0.54"N  10°34'27.62"E - EPSG:4326“Se la conoscenza deve essere aperta a tutti,perchè mai limitarne l’accesso?” R. StallmanQuesto documento, allegati inclusi, contiene informazioni di proprietà di FIANDACA SALVATORE e deve essere utilizzato esclusivamente dal destinatario in relazione alle finalità per le quali è stato ricevuto. E' vietata qualsiasi forma di riproduzione o divulgazione senza l'esplicito consenso di FIANDACA SALVATORE. Qualora fosse stato ricevuto per errore si prega di informare tempestivamente il mittente e distruggere la copia in proprio possesso.
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Re: [Qgis-user] Check Geometries Plugin - attribute value in results

[Nicolas Cadieux via QGIS-User]

Hi,I believe a sliver is only defined and identified when comparing the borders of one polygon with the borders of another (same or different layers).  When borders don’t match (ex: adjacent polygon nodes don’t match) a sliver is found.  It’s my understanding anyways…Nicolas CadieuxLe 29 mars 2023 à 03:27, Totò Fiandaca via QGIS-User  a écrit :What does the real value of Sliver polygon represent?- it's not the area of the polygon- it's not the perimeter- is not the area of the bounding boxso I ask if anyone can tell me what it represents, I can't find anything useful in the documentation.https://i.imgur.com/ISs4o1E.pngPlugin: https://docs.qgis.org/3.28/en/docs/user_manual/plugins/core_plugins/plugins_geometry_checker.html#geometry-checker-plugin-- Ing. Salvatore Fiandacamobile.:+39 327.493.8955 m: pigrecoinfin...@gmail.comC.F.: FNDSVT71E29Z103GP.IVA: 06597870820membro QGIS Italia - http://qgis.it/socio GFOSS.it - http://gfoss.it/member OSGeo - https://www.osgeo.org/member/fiandaca/blog: https://pigrecoinfinito.com/ FB: Co-admin - https://www.facebook.com/qgis.it/  TW: https://twitter.com/totofiandaca43°51'0.54"N  10°34'27.62"E - EPSG:4326“Se la conoscenza deve essere aperta a tutti,perchè mai limitarne l’accesso?” R. StallmanQuesto documento, allegati inclusi, contiene informazioni di proprietà di FIANDACA SALVATORE e deve essere utilizzato esclusivamente dal destinatario in relazione alle finalità per le quali è stato ricevuto. E' vietata qualsiasi forma di riproduzione o divulgazione senza l'esplicito consenso di FIANDACA SALVATORE. Qualora fosse stato ricevuto per errore si prega di informare tempestivamente il mittente e distruggere la copia in proprio possesso.
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Re: [Qgis-user] Export n Shapefiles to GDB file

[Nicolas Cadieux via QGIS-User]

Hi,

I don’t work much with Geodatabase files but you can save multiple Shapefiles 
to a geopackage specifying the layer names for each input Shapefiles (I would 
try that first with the GDB file). Then, you could convert the geopackage to 
Geodatabase. 
Nicolas

Envoyé de mon iPad

> Le 16 mars 2023 à 13:32, Gonzalo Lesperguer via QGIS-User 
>  a écrit :
> 
> 
> Hi to all, is it possible to export multiple shapefiles to a GDB file, I have 
> tried but the result is only one shapefile.
> 
> BR 
> 
> Gonzalo
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Re: [Qgis-user] Export as image -> jpeg - Where to find the compression rate setting ?

[Nicolas Cadieux via QGIS-User]

Hi,
Try gdal translate.  You can add compression type and compression levels.  Look 
in the advanced options. Press the help button.
Nicolas

Envoyé de mon iPad

> Le 14 mars 2023 à 10:29, info--- via QGIS-User  a 
> écrit :
> 
> 
> Hello everyone, 
> 
> I would like to know if there is an option or setting somewhere in Qgis, to 
> adjust the compression rate of the jpeg format when exporting a layout: 
> "export to image format" -> jpeg/jpg. I couldn't find anything in the Qgis 
> configuration options, but maybe there is a setting in the advanced 
> configuration settings (you get lost quickly because there are so many 
> settings... and I'm not an expert on this point)? 
> Anyone got a lead? 
> 
> THANKS, 
> Olivier
> 
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Re: [Qgis-user] Creation of a flowmesh

[Nicolas Cadieux via QGIS-User]

Hi,

Try running it in Saga directly.  If you stick to QGIS, make sure you run all 
intermediate layers as temporary files.  In the past, I had some models fail in 
Saga because I was saving intermediate layers as .tiff along the way. If this 
is still a problem, or if it runs in saga but not QGIS, file a bug report.

Nicolas

Envoyé de mon iPad

> Le 12 mars 2023 à 15:58, Sajjad Mohammadpour via QGIS-User 
>  a écrit :
> 
> 
> Hello all,
> 
> Hope you are doing fine.
> 
> I am trying to create a flowmesh using SAGA. I have already created a flow 
> direction layer using SAGA -->Terrain analysis. The next step is to create a 
> flow mesh using the flow direction as an input argument. after I add the flow 
> direction and select a directory for the output, I hit the run button. It 
> takes a few minutes to create the flowmesh. The issue is that after the 
> flowmesh is created and I have added it to the canvas and have made changes 
> to see the directions (arrows) of the flow, it does not show anything (see 
> image 2). and the error that comes up after I have added the flowmesh onto 
> the cancas is as image 1.
> 
> It would be deeply appreciated if you could help me with that.
> 
> Regards,
> 
> Sajjad
> 
> 
> 
> <1.JPG>
> <2.JPG>
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Re: [Qgis-user] Add distance to shapefile M

[Nicolas Cadieux via QGIS-User]

This should helpWriting a feature-based processing algorithm at the example of M-value interpolationopengis.chhttps://docs.qgis.org/3.22/en/docs/user_manual/expressions/functions_list.html#make-point-m12.2. List of functions — QGIS Documentation documentationdocs.qgis.orgEnvoyé de mon iPadLe 10 mars 2023 à 15:25, Stewart Holt via QGIS-User  a écrit :The need is to put cumulative distance on each point, so P1.M would be zero, P2.M would be the 3D distance from P1 to P2 and P3.M would be the sum of P2.M plus the 3D distance from P2 to P3, etc. The M value of each point would be the cumulative 3D distance from P1.Uses of the M value are the ability to click on line and get distance and in producing elevation profiles.StewartOn Fri, Mar 10, 2023 at 2:44 PM Andrea Giudiceandrea via QGIS-User  wrote:Hi Stewart,
it is not clear to me exactly what to want to achieve. If you want to 
calculate the 3d length of a 3d line, then you can use the length3d 
function 
https://docs.qgis.org/3.22/en/docs/user_manual/expressions/functions_list.html#length3d

Best regards.

Andrea Giudiceandrea
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Re: [Qgis-user] how to export label background boxes

[Nicolas Cadieux via QGIS-User]

Hi,

Maybe project/import export/ export project to dxf.  Then re-import the 
labels...


https://www.cadlinecommunity.co.uk/hc/en-us/articles/360011997298-QGIS-to-CAD-Export-Labels-to-CAD

Nicolas

On 2023-03-01 3:42 a.m., Uwe via QGIS-User wrote:


Hello list,

does anybody know if there is a way to convert/export the QGIS label 
background graphics (eg boxes or ellipses) to shapes?


For those who know ArcMap: what I need is what ArcMap creates when 
Annotation features are written to Shape format, that means: boxes 
surrounding their text strings like an envelope.


Thanks and happy day, U.


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--
Nicolas Cadieux
https://gitlab.com/njacadieux
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Re: [Qgis-user] buffered polygons without overlaps

[Nicolas Cadieux via QGIS-User]

« I'm sure there's got to be some combination of buffering, clipping, 
difference, intersection, union, and dissolve operations that will get me what 
I need, but I just can't visualise it. »
Yup!

If you can send me a copy or part of the files, I could have a shot at it and 
then give you the breakdown.  

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 2 mars 2023 à 12:48, Cory Albrecht via QGIS-User 
>  a écrit :
> 
> 
> Hello,
> 
> I've been trying to find a way to buffer a bunch of touching polygons so that 
> the touching sides get buffered, only the "outside".
> 
> I'm working off a shapefile of Scotland's 1930s civil parishes that I need to 
> combine with another map of Scotland that has better coastal resolution and 
> more complete islands. But the civil parishes map has a different coastline 
> so I need to make that outer edge of the outer ring of parishes match the 
> higher resolution coastline data, not worrying about the extra islands for 
> the moment.
> 
> Regular buffer won't work, because all polygons will get extended and there 
> will be overlaps.
> 
> I tried using this solution:
> 
> https://gis.stackexchange.com/questions/175599/buffer-neighbouring-polygons-without-overlap-using-qgis
> 
> but it didn't preserve the inner boundaries like I need. They ended up being 
> wildly different.
> 
> I found a plugin "Buffer without overlaps" and it almost does what I need. It 
> sections off the overlaps as separate polygons (with shrunken versions of the 
> originals) but it consolidates those overlaps as one polygon that overlaps 
> the two original polygons instead of two polygons split by the original 
> border, so I cannot just dissolve them back together with some attribute 
> filter.
> 
> 
> I'm sure there's got to be some combination of buffering, clipping, 
> difference, intersection, union, and dissolve operations that will get me 
> what I need, but I just can't visualise it.
> 
> I just use QGIS for a hobby, so I don't know all the neat computational 
> tricks possible in the GIS field that I could use to do this, so any 
> assistance or guidance on how to accomplish this task would be greatly 
> appreciated.
> 
> Thanks in advance!
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[Qgis-user] Updating models on the QGIS site

[Nicolas Cadieux via QGIS-User]

Hi,
I have a 3 models that have been improved (Fix Directional Network,
Check Geometries, model 1 of 3.)  and fixed. I presented today at the
QGIS OpenDay.

I had to remove the "Snap to anchor nodes (single layer only)" as it
was creating invalid geometries in QGIS 3.28.2-Firenze on Windows 11.

I am not sure exactly how to upload the new models? I see the upload
button but I am wondering what will happen to the old ones? Will they
be removed by someone managing the site?  Can we have multiple
versions of the model as I am using the new repair geometry tools
unavailable before 3.28? Is it possible to modify a models'
description myself or must I send and email somewhere?

I did send a copy of this email to the developer email list but I don’t  have 
any answers yet.

Thanks

Nicolas Cadieux
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[Qgis-user] Is your Directional Linear Network Driving You Crazy? If so, you are not alone!!!

[Nicolas Cadieux via QGIS-User]

Hi,


On Friday, at the QGIS Open Day,  I will be presenting 3 QGIS models I made
to help people troubleshoot GIS networks.  If you are having problems
running network analysis tools with your crappy data, then... this talk is
for you!  It will be at 10:00 am Montréal time or 15h00 UTC.  Please show
up if you wish… share if you can!



Nicolas Cadieux



https://github.com/qgis/QGIS/wiki/QOD-February-2023
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Re: [Qgis-user] Polygons

[Nicolas Cadieux via QGIS-User]

Hi,

It would help if you told us what format your data is in.  If it’s rasters, you 
can start by georeferencing the file and then do a raster to polygon 
transformation (vectorize).  I think there are some other tools that you can 
use to accelerate tracing.  You will also find plugins 
https://plugins.qgis.org/plugins/raster_tracer/

Nothing will be easy though, you will still need to verify and carefully look 
at the data.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 21 févr. 2023 à 12:06, jessica swan via QGIS-User 
>  a écrit :
> 
> Hi,
> 
> I hope everyone is well!
> 
> I am making a map marking regions for a project because I am not allowed to 
> copy and paste an image. There are over a hundred regions for me to outline! 
> Is there any way to automatically trace these regions and overlay that 
> tracing on a map? It will just take so much time, otherwise!
> 
> Thanks in advance.
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Re: [Qgis-user] Google Maps

[Nicolas Cadieux via QGIS-User]

This is more specific,

https://about.google/brand-resource-center/products-and-services/geo-guidelines/

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 18 févr. 2023 à 22:45, Nicolas Cadieux  a 
> écrit :
> 
> Hi,
> 
> This should help.  
> https://www.google.com/intl/en-GB_ALL/permissions/geoguidelines/
> 
> Nicolas Cadieux
> https://gitlab.com/njacadieux
> 
>>> Le 18 févr. 2023 à 11:46, jessica swan via QGIS-User 
>>>  a écrit :
>>> 
>> 
>> Hi,
>> 
>> I see that it should be possible for me to use and edit Google Maps 
>> screenshots in my thesis, but I would like to be 100% sure. Is it alright?
>> 
>> Thanks,
>> 
>> Jess Swan
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Re: [Qgis-user] Google Maps

[Nicolas Cadieux via QGIS-User]

Hi,

This should help.  
https://www.google.com/intl/en-GB_ALL/permissions/geoguidelines/

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 18 févr. 2023 à 11:46, jessica swan via QGIS-User 
>  a écrit :
> 
> 
> Hi,
> 
> I see that it should be possible for me to use and edit Google Maps 
> screenshots in my thesis, but I would like to be 100% sure. Is it alright?
> 
> Thanks,
> 
> Jess Swan
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Re: [Qgis-user] Two LAZ file possible issues iwth some new data we received to processs

[Nicolas Cadieux via QGIS-User]

Hi,

I did run into this layer number limite in the past.  If you check the user 
list or if you Google “QGIS, maximum amount of layers… “ you will find multiple 
post. The issue, at the time was caused by limites in the OS.  (Windows 7 at 
the time), OSX had and easy work around.  Same thing for the various flavours 
of  Linux.

At the time, I either combined files when using QGIS or opened them in Saga 
that did not have this problem. I believe this was  because Saga, at least back 
then, loaded all the file into memory and did not keep a handle on the files 
once is was open.

This is the type of thing that got me into learning Python so that I could 
create loops and speed up operations on LiDAR data.

It’s normal (or at least expected)  for large batches of file to have bugs in 
them like missing crs in headers.  File transfers can be difficult to handle.  
Talk with the provider to see if they have the same issue.  If you know a bit 
of Python, I could send you a script that reads the LiDAR header directly. 

LasPy is a good little library for this 
https://laspy.readthedocs.io/en/latest/intro.html#header 

You could find tools in WhiteboxTools also. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 16 févr. 2023 à 17:50, Mike Stanton via QGIS-User 
>  a écrit :
> 
> 
> I have LAZ files  for a square mile of the local area where my office is and 
> when it is loaded under QGIS I hit two problems. It is a bit over 2000 files 
> and I seem to have hit a capacity limit where it stops processing the images 
> at about 200 files.  The message being output for the files is “Failed to 
> Calculate Statistics of the Point Cloud of .LAZ”.   Breaking it 
> into smaller pieces gets the project around the scale limits of the product 
> because the doing only the rejected files gets me more files processed, but 
> it is not convenient considering I expect to be processing a lot more of 
> these files.
>  
> The other problem is that QGIS tells me I don’t have a CRS for the images and 
> the image has a field that says “No CRS Found” in the log file and what I 
> have is data in the header that says “COMPD_CS [“Projected”, PROJCS “UTM 
> 15N”, GEOGCS [WGS84 …. “  but the strings have unpaired square brackets round 
> the relevant text. Is this what may be causing the error to occur?  
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[Qgis-user] Using qgis with a 4k screen and a HD screen.

[Nicolas Cadieux via QGIS-User]

Hi,

Seems like  QGIS adjusts the GUI settings based on my 4K high resolution
screen.  When I move the windows over to the HD 1080 screen, Icon size and
font size needs to be adjusted in the settings but the processing toolbars
and layer Styling toolbars remain chunky.  I notice they seem to take into
consideration the scaling of the main screen even if QGIS starts on the
secondary HD screen.

Is there a GUI setting that could help and that I am missing? Is there any
way I can make these changes on the fly when QGIS is moved from one screen
to the other?

Thanks
Nicolas Cadieux
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Re: [Qgis-user] LIDAR

[Nicolas Cadieux via QGIS-User]

Hi,

On regular raster and vector layers, you can also right click on the layer in 
the layer manager and cut and paste the style.  I figure it must be the same 
with LiDAR.  CloudCompare is also very good for working with LiDAR.  I have 
been working with files with over 250 millions points lately with no trouble.  
Same thing in QGIS. So far so good!

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 14 févr. 2023 à 09:05, Kirk Schmidt via QGIS-User 
>  a écrit :
> 
> 
> Hi Allan:
> 
> One way is to combine the files into a super file which may not be an option 
> due to size.  The other would be to find the total range of z values in your 
> project area and set the min and max symbology for the Z attribute.  while 
> using the attributes by ramp option.  You can save the style and use it for 
> the remaining point clouds.
> 
> Kirk Schmidt
> 
> On 2/13/2023 11:49 PM, Allan Younger via QGIS-User wrote:
>> Hi everyone,
>> I have multiple Lidar downloaded las files, on opening find each has its 
>> individual range of levels.
>> How can I shade uniform levels?
>>  200m plus points in several of blocks.
>> Chrs
>> AY
>> 
>> 
>> 
>> 
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> -- 
> Kirk Schmidt, MScF, BScF, RPF
> General Manager
> Nortek Resource Solutions Inc.
> 26 Church Road
> Sutherlands River, NS
> B0K 1W0
> Tel (902) 922.3607
> Email: k...@nortekresources.com
> Web: www.nortekresources.com
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Re: [Qgis-user] Azimuth and orientation of 2 features

[Nicolas Cadieux via QGIS-User]

You can create a line using both centroid then use the azimuth function.

https://gis.stackexchange.com/questions/264422/displaying-azimuth-of-line-in-qgis

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 12 févr. 2023 à 12:57, Alexandre Rodier via QGIS-User 
>  a écrit :
> 
> 
> Dear list.
> I have a question I am not able to resolve:
> 
> I need to calculate the orientation (North, East, South or North) of a 
> feature (Polygon, a parcel) respect of another one (Line, a road).
> I calculated the azimuth of the two features using the centroids of each but 
> the formulas I found don't really work, or I am doing something wrong (it's 
> probably that :-) ).
> I am sure that's a simple problem but I am quite blocked.
> 
> Thanks in advance for your help.
> Alex
> 
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Re: [Qgis-user] QGIS and historical battle

[Nicolas Cadieux via QGIS-User]

Hi,

You cannot do simulations like video games with QGIS but yes, you can map all 
your data, do viewshed analyses to see what you can see from where, figure out 
distances and area of potential battle field…. Eliminate battle grounds based 
on thing like slope angles.   Like others have said, make sure you have the 
proper archaeological  permits before you begin or else you may very well 
destroy what you are trying to save.  If you give us more information, we could 
point you the right direction for the data.  I imagine others have had the same 
idea!  I would be nice to map out that data too to try and figure out various 
locations.

If you don’t have a DEM, or LiDAR data (this would be ideal), then I suggest 
the NASADEM.  Police video of crowd sizes during demonstration, or parade data 
like what is done in France or in Russia on celebrations days could be a good 
place to start to figure out how many people fit in a certain area.  This would 
be a minimum bounding box I guess as the exact combat methods would need to be 
studied. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 3 févr. 2023 à 03:20, Lazanu Ciprian-Cătălin via QGIS-User 
>  a écrit :
> 
> 
> 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] distance

[Nicolas Cadieux via QGIS-User]

Hi,

Are interested in the straight line distances between the points and the roads? 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 26 janv. 2023 à 17:03, Amba BH via QGIS-User  a 
> écrit :
> 
> 
> Hi,
> 
> 0
> 
> I have 2 layers roads (line layer,where I have the type column : A,B..types) 
> and settlements(point layer where I have the name column and the number of 
> population in 2000)
> 
> calculate the number of population in 2000 who lived within settlements less 
> than 300 meters from “A” and “B”?
> 
> Thank you
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Re: [Qgis-user] The theory behind topology

[Nicolas Cadieux via QGIS-User]

Thanks!

I was trying to find the right terms for the Google search.  This and the other 
link that people shared is exactly what I needed.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 11 janv. 2023 à 10:26, David Strip  a écrit :
> 
>  If you're asking the more general question about various geometric 
> algorithms (like intersection, union, inclusion, etc) you might want to look 
> at a text on computational geometry.
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Re: [Qgis-user] The theory behind topology

[Nicolas Cadieux via QGIS-User]

Thanks!

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 10 janv. 2023 à 23:37, Terry Morse via QGIS-User 
>  a écrit :
> 
> 
> Principles of Geographical Information Systems, by Burrough and McDonnell 
> (Oxford: Oxford Univ. Pr., 1998; ISBN 0198233655) has a brief treatment of 
> point-in-polygon on page 64 (box 3.4), or see Principles of Geographical 
> Information Systems, 3rd ed., by Burrow, McDonnell, and Lloyd (Oxford: Oxford 
> Univ. Pr. 2015; ISBN 0198742845), where it is Box 7.3 on page 140. It may not 
> be as detailed as you want, but it's a beginning. Wikipedia has an article 
> with a little more detail at https://en.wikipedia.org/wiki/Point_in_polygon 
> that includes references.
>  
> There are scripts at 
> https://www.geeksforgeeks.org/how-to-check-if-a-given-point-lies-inside-a-polygon/
>  in both c++ and python.
>  
> Terry Morse
> tmo...@teleport.com
>  
> -Original Message-
> From: Nicolas Cadieux 
> Sent: Jan 10, 2023 7:23 PM
> To: Qgis List 
> Subject: [Qgis-user] The theory behind topology
> 
>  
> Hi,
> 
> I am curious to learn the math behind topology.  For example, I would like to 
> know how something like “selecting points in a polygon “ is actually done 
> from a programming point of view.  If you have a good resource (books, video, 
> articles…) please send it my way.
>  
> Thanks
> 
> Nicolas Cadieux
> https://gitlab.com/njacadieux
>  
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[Qgis-user] The theory behind topology

[Nicolas Cadieux via QGIS-User]

Hi,

I am curious to learn the math behind topology.  For example, I would like to 
know how something like “selecting points in a polygon “ is actually done from 
a programming point of view.  If you have a good resource (books, video, 
articles…) please send it my way.

Thanks

Nicolas Cadieux
https://gitlab.com/njacadieux___
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Re: [Qgis-user] Convert an ALOS PALSAR DEM from ellipsoidal to geoid.

[Nicolas Cadieux via QGIS-User]

Hi,

Will do. I’am heading out of the woods now.  In the mean time, look at the 
metadata to find out what ellipsoid is being used by the file.  I believe it’s 
probably EMG96 but can you confirm? 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 2 janv. 2023 à 08:01, Eddison Araya  a écrit :
> 
> 
> Hello Nicolás Cadieux, I hope you had a nice end and beginning of the year!
> 
> Ok very good, so I await your message with the step by step, just in case I 
> attach the image:
> 
> 
> https://drive.google.com/file/d/1mJvB77MMOF86X7I4qwtS3i7UYq1wYmGR/view?usp=share_link
> 
> 
> Greetings and thank you very much
> 
> Eddison
> 
> 
> 
> 
> 
>> El jue, 29 dic 2022 a las 21:11, Nicolas Cadieux 
>> () escribió:
>> Hi,
>> 
>> Google  vdatum https://vdatum.noaa.gov/  Contact me early next year and I 
>> can help you step by step.  I can’t help you more now because i’am far from 
>> civilisation with very limited internet access.
>> 
>> Nicolas Cadieux
>> https://gitlab.com/njacadieux
>> 
 Le 28 déc. 2022 à 09:52, Eddison Araya via QGIS-User 
  a écrit :
 
>>> 
>>> Hello, a pleasure to greet you.
>>> 
>>> I need to convert an ALOS PALSAR DEM from ellipsoidal to geoid.
>>> 
>>> Does anyone know how to do this process step by step?
>>> 
>>> Thank you
>>> 
>>> Eddison
>>> 
>>> 
>>> 
>>> 
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Re: [Qgis-user] GeoTiff losing CRS

[Nicolas Cadieux via QGIS-User]

Hi,

It would help is you explained what exact algorithm you are using to process 
the images. Some plugins may not add the CRS to the file while some will not.  
Data type and compression will have no effect as expected, unless you are 
dealing with a bug.  If you keep on having the problems, just open the file, 
specify the CRS and save it with a new name.  This way, the CRS will be 
embedded it the tiff header.

Why are you creating a virtual image in the first place?  Are you trying to 
stitch multiple files together before doing the pansharpening? IMHO, Results 
should be better if you go at it one scene at a time and then stitch the 
results later, unless you have no overlapping scenes…

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 31 déc. 2022 à 16:35, Grant Boxer via QGIS-User 
>  a écrit :
> 
> 
> Happy New Year to all!
>  
> I have been processing satellite imagery and producing pansharpened images. I 
> create a virtual image with CRS no problem, but when I save  the resulting 
> GeoTiff file it loses its CRS and results in an invalid projection. I have 
> tried changing the data types and compressions with no luck. I find that when 
> you do the first image it might work, but doing a second image it loses the 
> CRS. Not sure whether this is a proj or gdal issue. Any thoughts?
>  
> Cheers Grant, Perth WA.
>  
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Re: [Qgis-user] QGIS 3.22 - Geometry by expression howto

[Nicolas Cadieux via QGIS-User]



Hi,

Try decimal with commas. Check your local system settings.  Could this be a 
wrong CRS problem?  Try zoom to layer extent to see if they pop up in the wrong 
place.  Share a few examples so we can check. Try  exporting the geometries to 
Wkt in a new field to see what happens…. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 31 déc. 2022 à 12:24, Francesco Pelullo via QGIS-User 
>  a écrit :
> 
> 
> 
> Il sab 31 dic 2022, 16:35 Andrea Giudiceandrea via QGIS-User 
>  ha scritto:
> 
>> is the preview result of the  make_point(to_real(@long), to_real(@lat)) 
>> expression displayed in the expression editor correct?
> 
> 
> Yes, It reports ""
> 
>> Have you checked if the preview results of the @long, @lat, to_real(@long) 
>> and to_real(@lat) are correct?
> 
> 
> Yes, they are correct and I am usual to store project variables in my models, 
> then read them as to_real(@something) because some time there are problems 
> with decimal points.
> 
>> What is the char used as decimal separator in the @long and @lat variables 
>> value?
> 
> 
> Separator for decimals is dot, i correctly formatted it. 
> 
> Other suggestions?
> 
> Have an Happy New Year to everyone.
> 
> Francesco 
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Re: [Qgis-user] Convert an ALOS PALSAR DEM from ellipsoidal to geoid.

[Nicolas Cadieux via QGIS-User]

Hi,

Google  vdatum https://vdatum.noaa.gov/  Contact me early next year and I can 
help you step by step.  I can’t help you more now because i’am far from 
civilisation with very limited internet access.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 28 déc. 2022 à 09:52, Eddison Araya via QGIS-User 
>  a écrit :
> 
> 
> Hello, a pleasure to greet you.
> 
> I need to convert an ALOS PALSAR DEM from ellipsoidal to geoid.
> 
> Does anyone know how to do this process step by step?
> 
> Thank you
> 
> Eddison
> 
> 
> 
> 
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Re: [Qgis-user] Rendering of Back Ground Image in Map Output

[Nicolas Cadieux via Qgis-user]

Hi,

Assuming we are following Google term of use 
https://www.google.com/intl/en-GB_ALL/permissions/geoguidelines/ , the easiest 
way out of this problem is to bypass the Google server when printing as it will 
effectively limit the number of pixels it feeds you.   What I did, in the past 
was to zoom in, and export the project as an image, pan and then start over 
again.  These .tiff files will be georeferenced.  I would then load these file 
into the project and use those as the background.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 2 déc. 2022 à 03:44, Bibek Rana via Qgis-user  
> a écrit :
> 
> 
> Hello Team,
> I'm using Qgis 3.22 and I am trying to prepare a shape file map with Google 
> Satellite image as background in A1 size paper. I am using 600 dpi and 
> rendering mode Multiply while exporting the map as PDF. 
> However, when I zoom in on the output map, the Google Satellite background is 
> heavily pixelated. 
> So, can you please provide me with solutions? I've attached the sample image 
> below.
> 
> 
> 
> Regards,
> Bibek
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Re: [Qgis-user] QGIS - Cluster Points alongside lines by a limit

[Nicolas Cadieux via Qgis-user]

Hi,

I think geoda should be able to help you with some parts of  this. 
https://geodacenter.github.io/download.html. This software will cluster points 
in various group size but will use euclidien distances.

If you are interested in the distances along the network, then the idea would 
be to build a distance matrix based on the network distances (like an all 
paires Djikstra) https://www.mdpi.com/2306-5729/5/1/8 and then to use that 
matrix to create groups based on the n neighbor analysis.  This may take some 
python programming. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 29 nov. 2022 à 08:37, Fabian Laumer via Qgis-user 
>  a écrit :
> 
> 
> Hello together,
>  
> in QGIS I have a street layer (lines) and a house layer (points) with a start 
> point.
> (picture 1)
>  
> I want to cluster the points alongside the line layer in groups of 20 or 10 
> points. The result should look like that:
> (picture 2)
>  
> Each coloured line in picture 2 represents a different cluster. The result 
> was made manually and took a long time, is there any possibility to cluster 
> the points automatically?
>  
> I prefer groups of 20 and 10 points per line, in some cases I have to use a 
> bit less or more.
>  
>  
> You can find the picutures and the layer examples here:
> Sync.com - Cluster Points alongside Lines
>  
>  
>  
> Thanks in advance!
>  
> Best regards,
> Fabian Laumer
>  
> HPE Planung und Entwicklung GmbH
> Tel.+49 8564 96300-28
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Re: [Qgis-user] SRTM problem

[Nicolas Cadieux via Qgis-user]

Hi,

Go to the  layer properties, rendering, then change the rendering zoom in or 
zoom out interpolation methods. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 29 nov. 2022 à 04:47, Lazanu Ciprian-Cătălin via Qgis-user 
>  a écrit :
> 
> 
> Hello, 
> I have a project and I want to create a map using SRTM as a background.  
> I upload it ... and looks like that ... 
> 
> 
> 
> but my project area is smaller, so I need to zoom it ... and when I do that, 
> my SRTM looks like that ... 
> 
> 
> 
> 
> What can I do so the raster doesn't look so pixelated? 
> Thank you. 
> 
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Re: [Qgis-user] Missing python plugin support on Win7

[Nicolas Cadieux via Qgis-user]

Indeed,

I also suspect that QGIS will also have a very hard time as Python 3.9 
is not supported on Windows.


Nicolas

On 2022-11-25 10:37 a.m., Jürgen E. Fischer via Qgis-user wrote:

Hi Antonio,

On Fri, 25. Nov 2022 at 08:07:04 +0100, Antonio Valanzano via Qgis-user wrote:

So in Win7 is not possible to use any plugin apart from these 3

Your Win7.  On others it apparently works fine (general python support
including the plugin manager at least).  Anything in your logs?


Jürgen


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--
Nicolas Cadieux
https://gitlab.com/njacadieux

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Re: [Qgis-user] DXF layer locking

[Nicolas Cadieux via Qgis-user]

Btw, if I recall properly, drag and drop would open a dxf in read and write 
mode.  I think that if you open the dxf using the project import, the file will 
be read and copied to a geopackage.  The dxf file is probably closed after the 
import and the layer style from AutoCAD is respected.  You would need to test 
to see if this is still the case.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 22 nov. 2022 à 17:26, Nicolas Cadieux  a 
> écrit :
> 
> Hi,
> 
> Whatever you do, keep in mind that the lock is there for a reason.  Basically 
> it’s there to protect the file from corruption in the case where two people 
> or two programs are trying to read and write to the same file.  If the file 
> is not designed with this in mind or not being managed by a server, you risk 
> loosing or destroying your data.  Dxf is definitely not build with this in 
> mind.
> 
> Nicolas Cadieux
> https://gitlab.com/njacadieux
> 
>>> Le 21 nov. 2022 à 16:37, Sebastian Gutwein via Qgis-user 
>>>  a écrit :
>>> 
>> 
>> Hello, 
>> I was excited to discover recently that you can drag and drop DXF layers 
>> into QGIS. 
>> The layer keeps its reference to the dxf and when the dxf is changed the 
>> layer is updated. 
>> The only problem I have had is that if I have the layer open in QGIS AutoCAD 
>> won't let me save the dxf because it thinks it is open in another program. 
>> Does  anyone know if there is a workaround?
>> A way to load the dxf without telling Windows that it is in use? 
>> As a network layer or something?
>> 
>> I did find that if I use QCAD I do not have a problem saving the DXF. 
>> Unfortunately QCAD does not have all the functionality that we need.  
>> 
>> Thanks 
>> -Bas
>> 
>> -- 
>> ___
>> Sebastian "Bas* " Gutwein
>> *rhymes with Josh 
>> 
>> Regenerative Design Group
>> 1 Chevalier Ave
>> Greenfield, Ma 01301
>> Web: regenerativedesigngroup.com
>> (631) 241-1018
>> 
>> Look close, think big, make change.
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Re: [Qgis-user] DXF layer locking

[Nicolas Cadieux via Qgis-user]

Hi,

Whatever you do, keep in mind that the lock is there for a reason.  Basically 
it’s there to protect the file from corruption in the case where two people or 
two programs are trying to read and write to the same file.  If the file is not 
designed with this in mind or not being managed by a server, you risk loosing 
or destroying your data.  Dxf is definitely not build with this in mind.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 21 nov. 2022 à 16:37, Sebastian Gutwein via Qgis-user 
>  a écrit :
> 
> 
> Hello, 
> I was excited to discover recently that you can drag and drop DXF layers into 
> QGIS. 
> The layer keeps its reference to the dxf and when the dxf is changed the 
> layer is updated. 
> The only problem I have had is that if I have the layer open in QGIS AutoCAD 
> won't let me save the dxf because it thinks it is open in another program. 
> Does  anyone know if there is a workaround?
> A way to load the dxf without telling Windows that it is in use? 
> As a network layer or something?
> 
> I did find that if I use QCAD I do not have a problem saving the DXF. 
> Unfortunately QCAD does not have all the functionality that we need.  
> 
> Thanks 
> -Bas
> 
> -- 
> ___
> Sebastian "Bas* " Gutwein
> *rhymes with Josh 
> 
> Regenerative Design Group
> 1 Chevalier Ave
> Greenfield, Ma 01301
> Web: regenerativedesigngroup.com
> (631) 241-1018
> 
> Look close, think big, make change.
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Re: [Qgis-user] QGIS not reading data in all layers

[Nicolas Cadieux via Qgis-user]

Hi,

I have not seen this error before.  I would create a new user profile to test 
(never hurts).  My gut feeling is that your files are possibly corrupted.  Can 
you read the file with another computer.  I would scan the disk for possible 
errors (check disk on Windows).

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 20 nov. 2022 à 22:33, Matthew Grady via Qgis-user 
>  a écrit :
> 
> 
> Hi
>  
> Anyone able to assist
>  
> QGIS has stopped providing the layer data.
> Opening the Attribute table only provides a single line with no data. Or no 
> lines at all.
> The overall mapping layers show attribute labels but once I click the idenify 
> features nothing is produced.
>  
> Exporting doesn’t work as picture below shows.
> 
>  
> How to fix.
>  
>  
>  
>  
>  
>  
> Thank you and kind regards,Matthew Grady
>  
> 
>  
> Muswellbrook Shire Council | Matthew Grady | Technical Officer | Water and 
> Wastewater  
> T: 02 6549 3858 I E: matthew.gr...@muswellbrook.nsw.gov.au I 
> www.muswellbrook.nsw.gov.au
>  
> Note
> The Muswellbrook Council Administration Centre has moved to 
> Campbell’s Corner 60-82 Bridge Street Muswellbrook NSW 2333
>  
>  
> This information is intended for the addressee only. The use, copying, 
> disclosure of or distribution of this message or any information it contains, 
> by anyone other than the addressee is prohibited by the sender. Any views 
> expressed in this communication are those of the individual sender and may 
> not reflect the views or policy position of Muswellbrook Shire Council. They 
> should not be used, quoted or relied upon without official verification from 
> the General Manager. Information provided to Council in correspondence, 
> submissions or requests (verbal, electronic or written), including personal 
> information such as your name and address, may be made publicly available, 
> including via Council website, in accordance with the Government Information 
> (Public Access) Act (GIPA Act) 2009. No representation is made that this 
> email is free from viruses and virus scanning is the responsibility of the 
> addressee.
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Re: [Qgis-user] multiple csv file import

[Nicolas Cadieux via Qgis-user]

Hi,

Yes, you can do that very easily using QGIS.  Layer/add layer/add 
delimited text layer.  Then just export the layer in the format of your 
choice. You may need to convert the coordinates in decimal degrees (ex 
75 05 30.4 -> 75.0917800 ).


You can do this in Excel using =(A6)+(B6/60)+(C6/3600)+(D6/3600) A= Deg, 
B= Min, C=Sec, D= Decimal Sec.  Then export to csv.


Nicolas


On 2022-11-15 10:08 a.m., Salvatore Mellino via Qgis-user wrote:

Hello,

I would like to know if it is possible to import multiple csv files 
contained in a folder and to convert them in shapefiles (1 for each 
csv). All csv files are structured as "lat long value" separate by 
space and without any header line.


Thank you for your help! Regards,

Salvatore


--
Nicolas Cadieux
https://gitlab.com/njacadieux

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Re: [Qgis-user] project browser very, very slow

[Nicolas Cadieux via Qgis-user]

Hi,

I would start by creating a new user profile the. Restart QGIS using that 
profile.  Then, I would look at the network server.   Look at the latency to 
access this server?  What is the speed for the data transfers?  Try copying the 
file locally and test for speed.  Then, wms services could be very slow.  I 
would remove those from the projects and test.  

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 14 nov. 2022 à 09:15, Thomas Struller via Qgis-user 
>  a écrit :
> 
> Hallo dear list,
> 
> I use Qgis 3.28 latest Version on Win 11; Lenovo L14 Gen 1, 32 GB memory, AMD 
> Ryzen 7 PRO 4750U with Radeon Graphics, 1700 MHz, 8 Kern(e), 16 logische(r) 
> Prozessor(en)
> 
> Using the browser-panel and opening the project directory needs realy long 
> time. Not only a few seconds. Then opening a gpkg needs the same time. In 
> fact Qgis browser ist very, very slow on every action I do. Its no fun to use 
> Qgis. 
> 
> All data (gpkg, shp-file, raster data etc.) for my project is located in one 
> directory on a network drive  (win2016 file-server I guess).
> 
> In my project-file there are also links to some wms sercives.
> 
> What do I have to do, to accelerate the access to the project directory on 
> Qgis 3.28?
> 
> Kind regards
> Thomas
> 
> Mit freundlichen Grüßen
> 
> 
> Thomas Struller
> Diplom Geologe (Univ.), BDG, V18
> 
> Sachverständiger nach BBodSchG §18,
> SG1 Historische Recherche
> SG2 Pfad Boden – Gewässer
> Akademischer Geoinformatiker
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> 
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> 
> 
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> Christian-Hessel-Straße 1
> 90427 Nürnberg
> i...@lga-geo.de
> www.LGA-geo.de
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Re: [Qgis-user] Problem display overlapping lines

[Nicolas Cadieux via Qgis-user]

Some interesting solution found in pgadmin 

https://gis.stackexchange.com/questions/261654/automatic-bus-route-map-without-overlaps

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 11 nov. 2022 à 09:13, Nicolas Cadieux  a 
> écrit :
> 
> Hi,
> 
> I am not aware of a function or of a plugin that does that. I would start by 
> googling.  A quick Google search has shown me this python solution. 
> https://gis.stackexchange.com/questions/239129/shifting-display-of-overlapping-lines-in-qgis
> 
> It was created for an earlier version of QGIS with another version of Python. 
> If would need to be adapted.  If this is for a small project (but to big to 
> do by hand) you could always just install a QGIS 2.XX version of QGIS in a 
> virtual machine to see if it works.
> 
> Then, you could ask help to adapt if to QGIS 3x.  Maybe there is a plugin 
> that already does this.
> 
> Nicolas Cadieux
> https://gitlab.com/njacadieux
> 
>>> Le 11 nov. 2022 à 06:45, Bombonato Antonio Maria 
>>>  a écrit :
>>> 
>> 
>> Thanks Nicolas.
>> Unfortunately, the problem is not to identify the overlapping lines.
>> I already have a shapefile that identifies the sections with multiple 
>> overlapping lines. In this shapefile, for each segment with overlaps, I have 
>> the indication of how many overlapping lines there are (at most 3).
>> The real problem is to draw the lines without overlappings.
>> Any suggestion will be appreciated.
>>  
>> 
>> Antonio Maria Bombonato
>> Software Developer
>> Business Unit Ultra Broadband
>> 
>> Italtel S.p.A.
>> Via Caldera, 21 
>> 20153 Milano MI – Italy
>> email: antoniomaria.bombon...@italtel.com
>> P: +39 024388388
>> www.italtel.com
>>  
>>  
>>  
>> Da: Nicolas Cadieux  
>> Inviato: martedì 8 novembre 2022 18:40
>> A: Bombonato Antonio Maria ; 
>> qgis-user@lists.osgeo.org
>> Oggetto: Re: [Qgis-user] Problem display overlapping lines
>>  
>> Hi,
>> 
>> It would be nice to have this QGIS.  My first reaction is to use line offset 
>> but the end result is not predictable. You may need to work with Python to 
>> do this.  You could also probably create a model. 
>> 
>> If you need to identify the overlapping segments, you can use my Fix 
>> Directional Network model 1 to 3.  You can download this on the plugin page. 
>> https://plugins.qgis.org/models/?order_by=-upload_date&_gallery=true
>> 
>> The first model will check the Geometries.  Test with all default values.  
>> After running this model, run the second model.  It should identify all 
>> partially overlapping lines.  This layer will be called "Potential Problem 
>> || Overlapping lines." You can open the second model and look at the "Find 
>> overlapping lines" algorithm to see how it's done.   It should find any 
>> overlapping or partially overlapping lines.
>> 
>> This video should help you figure things out. https://youtu.be/v61PafSByvM
>> 
>> It's not a total solution but it's at least a start!
>> 
>> Nicolas Cadieux
>> 
>>  
>> 
>> Le 2022-11-03 à 3:12 p.m., Bombonato Antonio Maria via Qgis-user a écrit :
>> Hello,
>> First of all, sorry for my english.
>> My name is Antonio Bombonato and it is the first time I ask a question to 
>> this mailing list.
>>  
>> I have a shapefile with multiple routes (each one is identified by an 
>> univoque OBJECT_ID) and some are partially overlapped (i.e they share the 
>> same segment). I need to display these routes so they are all visible and 
>> without overlapping.
>>  
>> i tryed using line offset but some line still remains overlapped.
>> Any idea to solve the problem, possibly using a python script, will be 
>> appreciated.
>>  
>> Attached the starting shapefile (cables) and the desired result I want to 
>> obtain (target).
>> In this case the shapefile target was created manually moving the vertices 
>> of each line.
>>  
>> P.S. I use 3.16.7-Hannover QGIS version
>>  
>> Best regards,
>> Antonio
>>  
>> 
>> Antonio Maria Bombonato
>> Software Developer
>> Business Unit Ultra Broadband
>> 
>> Italtel S.p.A.
>> Via Caldera, 21 
>> 20153 Milano MI – Italy
>> email: antoniomaria.bombon...@italtel.com
>> P: +39 024388388
>> www.italtel.com
>>  
>>  
>>  
>> 
>> 
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Re: [Qgis-user] Problem display overlapping lines

[Nicolas Cadieux via Qgis-user]

Hi,

I am not aware of a function or of a plugin that does that. I would start by 
googling.  A quick Google search has shown me this python solution. 
https://gis.stackexchange.com/questions/239129/shifting-display-of-overlapping-lines-in-qgis

It was created for an earlier version of QGIS with another version of Python. 
If would need to be adapted.  If this is for a small project (but to big to do 
by hand) you could always just install a QGIS 2.XX version of QGIS in a virtual 
machine to see if it works.

Then, you could ask help to adapt if to QGIS 3x.  Maybe there is a plugin that 
already does this.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 11 nov. 2022 à 06:45, Bombonato Antonio Maria 
>  a écrit :
> 
> 
> Thanks Nicolas.
> Unfortunately, the problem is not to identify the overlapping lines.
> I already have a shapefile that identifies the sections with multiple 
> overlapping lines. In this shapefile, for each segment with overlaps, I have 
> the indication of how many overlapping lines there are (at most 3).
> The real problem is to draw the lines without overlappings.
> Any suggestion will be appreciated.
>  
> 
> Antonio Maria Bombonato
> Software Developer
> Business Unit Ultra Broadband
> 
> Italtel S.p.A.
> Via Caldera, 21 
> 20153 Milano MI – Italy
> email: antoniomaria.bombon...@italtel.com
> P: +39 024388388
> www.italtel.com
>  
>  
>  
> Da: Nicolas Cadieux  
> Inviato: martedì 8 novembre 2022 18:40
> A: Bombonato Antonio Maria ; 
> qgis-user@lists.osgeo.org
> Oggetto: Re: [Qgis-user] Problem display overlapping lines
>  
> Hi,
> 
> It would be nice to have this QGIS.  My first reaction is to use line offset 
> but the end result is not predictable. You may need to work with Python to do 
> this.  You could also probably create a model. 
> 
> If you need to identify the overlapping segments, you can use my Fix 
> Directional Network model 1 to 3.  You can download this on the plugin page. 
> https://plugins.qgis.org/models/?order_by=-upload_date&_gallery=true
> 
> The first model will check the Geometries.  Test with all default values.  
> After running this model, run the second model.  It should identify all 
> partially overlapping lines.  This layer will be called "Potential Problem || 
> Overlapping lines." You can open the second model and look at the "Find 
> overlapping lines" algorithm to see how it's done.   It should find any 
> overlapping or partially overlapping lines.
> 
> This video should help you figure things out. https://youtu.be/v61PafSByvM
> 
> It's not a total solution but it's at least a start!
> 
> Nicolas Cadieux
> 
>  
> 
> Le 2022-11-03 à 3:12 p.m., Bombonato Antonio Maria via Qgis-user a écrit :
> Hello,
> First of all, sorry for my english.
> My name is Antonio Bombonato and it is the first time I ask a question to 
> this mailing list.
>  
> I have a shapefile with multiple routes (each one is identified by an 
> univoque OBJECT_ID) and some are partially overlapped (i.e they share the 
> same segment). I need to display these routes so they are all visible and 
> without overlapping.
>  
> i tryed using line offset but some line still remains overlapped.
> Any idea to solve the problem, possibly using a python script, will be 
> appreciated.
>  
> Attached the starting shapefile (cables) and the desired result I want to 
> obtain (target).
> In this case the shapefile target was created manually moving the vertices of 
> each line.
>  
> P.S. I use 3.16.7-Hannover QGIS version
>  
> Best regards,
> Antonio
>  
> 
> Antonio Maria Bombonato
> Software Developer
> Business Unit Ultra Broadband
> 
> Italtel S.p.A.
> Via Caldera, 21 
> 20153 Milano MI – Italy
> email: antoniomaria.bombon...@italtel.com
> P: +39 024388388
> www.italtel.com
>  
>  
>  
> 
> 
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Re: [Qgis-user] Problem display overlapping lines

[Nicolas Cadieux via Qgis-user]

Hi,

It would be nice to have this QGIS.  My first reaction is to use line 
offset but the end result is not predictable. You may need to work with 
Python to do this.  You could also probably create a model.


If you need to identify the overlapping segments, you can use my Fix 
Directional Network model 1 to 3.  You can download this on the plugin 
page. 
https://plugins.qgis.org/models/?order_by=-upload_date&_gallery=true


The first model will check the Geometries.  Test with all default 
values.  After running this model, run the second model.  It should 
identify all partially overlapping lines.  This layer will be called 
"Potential Problem || Overlapping lines." You can open the second model 
and look at the "Find overlapping lines" algorithm to see how it's 
done.   It should find any overlapping or partially overlapping lines.


This video should help you figure things out. https://youtu.be/v61PafSByvM

It's not a total solution but it's at least a start!

Nicolas Cadieux


Le 2022-11-03 à 3:12 p.m., Bombonato Antonio Maria via Qgis-user a écrit :


Hello,

First of all, sorry for my english.

My name is Antonio Bombonato and it is the first time I ask a question 
to this mailing list.


I have a shapefile with multiple routes (each one is identified by an 
univoque OBJECT_ID) and some are partially overlapped (i.e they share 
the same segment). I need to display these routes so they are all 
visible and without overlapping.


i tryed using line offset but some line still remains overlapped.

Any idea to solve the problem, possibly using a python script, will be 
appreciated.


Attached the starting shapefile (cables) and the desired result I want 
to obtain (target).


In this case the shapefile target was created manually moving the 
vertices of each line.


P.S. I use 3.16.7-Hannover QGIS version

Best regards,

Antonio



*Antonio Maria Bombonato*

Software Developer
Business Unit Ultra Broadband

*Italtel S.p.A.*

Via Caldera, 21
20153 Milano MI – Italy

email: _antoniomaria.bombon...@italtel.com 
_


P: +39 024388388

www.italtel.com 


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Re: [Qgis-user] Opening a layout in "Zoom full" view

[Nicolas Cadieux via Qgis-user]

Hi,

Just tested on 3.26.3 on a brand new install (Windows 11 and all).  I 
confirm that this is a problem.  I would do a bug report. This should 
not be an option. Layout opens at 5.7% even when saved at 100%.


Nicolas

Le 2022-11-02 à 4:42 p.m., Tony Shepherd (FarmMaps NZ) a écrit :


Hi Nicolas

Yes, I too had those issues with MapInfo and AutoCAD in a previous 
life.  This is a stock standard QGIS layout, just a normal A4 and A3 
layout, both either portrait or landscape.


Any saved project, or any new project.  Add a layout or two that 
contain the normal layout elements (map window(s), scale bars, free 
text, attribute table etc).  All elements are within the “page”. Close 
everything, open that saved project file, open the layout or layouts, 
and the first view you get of that layout is a small view (say 20% or 
so).  Then press the View Extents button and then it zooms to the 
extent as expected.  So that tells me if there was an element placed 
in a strange place within the layout then zooming to the extents would 
then make that rogue element obvious, so in my case, I am sure that is 
not the reason.


I think it would be a good feature that when saving a project, the 
layout will open at the same view scale as when the project was saved, 
or perhaps have a flag that allows you to set a default layout zoom scale.


It seems to me that in V3.26, when using any project file old or new, 
the layouts seem to open at a much smaller zoom scale than previous 
version.


Cheers

Tony

*Tony Shepherd**|*  GeoSpatial / Mapping Manager

*Ph*027 435 6193 *|**E* t...@farmmaps.nz  
*|**W* shepherdphotos.co.nz 


FM_logo1_small (Custom)

**

** 
**


Cheers

Tony

*From:*Nicolas Cadieux 
*Sent:* Thursday, 3 November 2022 1:30 am
*To:* Tony Shepherd (FarmMaps NZ) 
*Cc:* Qgis Users List 
*Subject:* Re: [Qgis-user] Opening a layout in "Zoom full" view

Hi,

I have not experienced this yet in QGIS.  Is it in all of your 
projects or just one?  It could be related to a certain file.  In the 
past, I have had this problem with AutoCAD and Mapinfo.  It was 
usually related to a file having  objects around the 0,0 coordinate, 
(way off the normal coordinate system of the file).  Have you checked 
the individual file extents?


Nicolas Cadieux

https://gitlab.com/njacadieux



Le 1 nov. 2022 à 16:08, Tony Shepherd (FarmMaps NZ) via Qgis-user
 a écrit :



Hi All

Maybe a silly question, but not one that I could easily find an
answer to.

Is there a way to set QGIS so that when it opens an existing
layout that it automatically displays it in “Zoom full” mode or
maybe set a flag somewhere that when you save the project the
current layout zoom is retained so that on re-opening it pops back
to how it was last displayed?

V3.26 seems to behave so that whenever I open a previously saved
layout it is about the size of a postage stamp and I have to press
the “Zoom full” button, regardless of how I last saved it.

Thoughts?

Cheers

Tony

*Tony Shepherd**|*  GeoSpatial / Mapping Manager

*Ph*027 435 6193 *|**E* t...@farmmaps.nz 
*|**W* shepherdphotos.co.nz 



**

**




**

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Re: [Qgis-user] SAGA Strahler Order

[Nicolas Cadieux via Qgis-user]

Hi,

I normally don’t use the toolbox as it seems to have trouble saving saga 
rasters. This is a problem when saving the grid file then using them in another 
Saga process.  If I use the temporary files, then, all is good.  I have also 
worked a bit with the saga next gen plugin but Saga is pretty easy to use so I 
mostly go straight to Saga.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 2 nov. 2022 à 09:07, Klaus Mithöfer via Qgis-user 
>  a écrit :
> 
> Hi Nicolas,
> 
> do you use SAGA through QGIS toolbox? The message you might get there means 
> that QGIS does not support the SAGA Version and it might not work. You better 
> rung the process in SAGA.
> 
> You can download the latest SAGA version for Windows here: 
> https://sourceforge.net/projects/saga-gis/files/ its already Version 8.x for 
> Windows. Just run the algorithm in SAGA directly.
> 
> 
> Kind regards, Klaus
> 
> 
>> Am 02.11.22 um 12:51 schrieb Nicolas Cadieux via Qgis-user:
>> Hi,
>> I have not looked at saga lately but I am surprised to see it’s not 
>> supported in windows?!  I would use any other window version of Saga as I 
>> don’t think that algorithms has changed much.  The other option is to 
>> install Saga using Ubuntu in WSL.  You can download that in the Windows App 
>> Store.
>> Nicolas Cadieux
>> https://gitlab.com/njacadieux <https://gitlab.com/njacadieux>
>>>> Le 17 oct. 2022 à 05:28, Adamu El-Oji via Qgis-user 
>>>>  a écrit :
>>> 
>>> 
>>> Hi everyone
>>> I trying do water delineation  and Strahler Order plugin constant error
>>> SAGA 7.2.8 not support for windows
>>> Is there any option to that?
>>> Thanks
>>> Adamu El-Oji
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Re: [Qgis-user] Opening a layout in "Zoom full" view

[Nicolas Cadieux via Qgis-user]

Hi,

I have not experienced this yet in QGIS.  Is it in all of your projects or just 
one?  It could be related to a certain file.  In the past, I have had this 
problem with AutoCAD and Mapinfo.  It was usually related to a file having  
objects around the 0,0 coordinate, (way off the normal coordinate system of the 
file).  Have you checked the individual file extents? 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 1 nov. 2022 à 16:08, Tony Shepherd (FarmMaps NZ) via Qgis-user 
>  a écrit :
> 
> 
> Hi All
>  
> Maybe a silly question, but not one that I could easily find an answer to.
>  
> Is there a way to set QGIS so that when it opens an existing layout that it 
> automatically displays it in “Zoom full” mode or maybe set a flag somewhere 
> that when you save the project the current layout zoom is retained so that on 
> re-opening it pops back to how it was last displayed?
>  
> V3.26 seems to behave so that whenever I open a previously saved layout it is 
> about the size of a postage stamp and I have to press the “Zoom full” button, 
> regardless of how I last saved it.
>  
> Thoughts?
>  
> Cheers
> Tony
>  
> Tony Shepherd  |  GeoSpatial / Mapping Manager
>  
> Ph 027 435 6193  |  E t...@farmmaps.nz  |  W shepherdphotos.co.nz
>  
> 
>  
>  
> 
>  
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Re: [Qgis-user] GTFS Loader

[Nicolas Cadieux via Qgis-user]

Hi,

Look on the plugin site.  You should be able to find the developers. You will 
have more luck contacting them directly.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 25 oct. 2022 à 11:50, krishna Ayyala via Qgis-user 
>  a écrit :
> 
> 
> Hello,
> I have QGIS 3.28 version. I have installed GFS loader plugin. I have selected 
> the gtfs.zip file and loaded. After loading the layers from the Geopackage 
> upto 70%, I am getting the following error message. Can anyone help me fix 
> this please?
> 
> Regards.
> 
> 
> 
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Re: [Qgis-user] QGIS_process not mutli-threaded? or option?

[Nicolas Cadieux via Qgis-user]

Hi,

I’am not part of any QGIS developers team so take what I say with a grain of 
salt.  QGIS, when doing nothing, is probably not much multithreaded.  If you 
start rendering stuff, then, multithreading will, by default, kick in.  You can 
turn off that option or control the number of cores used in the default 
setting.  You can also activate openCL. That should accelerate certain 
algorithms but I don’t know which. It would be nice to have a list if one 
exists.  Cuda, probably because it is proprietary and hardware limited, will 
probably not be implemented unless someone makes a plugin that uses it.  

 Multithreading will kick in when individuals algorithms are used if they have 
been programmed that way.  One algorithms or plugin may be multithreaded while 
another, doing exactly the same thing, may not.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 21 oct. 2022 à 15:42, Dennis Burgess via Qgis-user 
>  a écrit :
> 
> 
> Looks like QGIS_process is not multi-threaded ☹  At least what I am seeing in 
> one core taken up?  Any method to speed this thing up? 
>  
>  
>  
> 
> Dennis Burgess, Mikrotik Certified Trainer
> MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage, Cambium ePMP 
> Certified
> Author of "Learn RouterOS- Second Edition”
> Link Technologies, Inc -- Mikrotik & WISP Support Services
> Office: 314-735-0270  Website: http://www.linktechs.net
> Need to Automate MikroTik Backups:  https://cloud.linktechs.net
> Create Wireless Coverage’s with www.towercoverage.com
> 
> 
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Re: [Qgis-user] SAGA Strahler Order

[Nicolas Cadieux via Qgis-user]

Hi,

I have not looked at saga lately but I am surprised to see it’s not supported 
in windows?!  I would use any other window version of Saga as I don’t think 
that algorithms has changed much.  The other option is to install Saga using 
Ubuntu in WSL.  You can download that in the Windows App Store. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 17 oct. 2022 à 05:28, Adamu El-Oji via Qgis-user 
>  a écrit :
> 
> 
> Hi everyone
> I trying do water delineation  and Strahler Order plugin constant error
> SAGA 7.2.8 not support for windows
> Is there any option to that?
> Thanks
> Adamu El-Oji 
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Re: [Qgis-user] export data of elevation profile

[Nicolas Cadieux via Qgis-user]

Hi,

Rasterized the las file (make a DEM).   Then, you can do a profile with that 
raster.  You can use the Gdal raster modules (nearest neighbour) algorithm. 
Others have suggested Cloud Compare.  That work well also.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 21 oct. 2022 à 09:11, Tony Sampaio via Qgis-user 
>  a écrit :
> 
> 
> Hi,
> Somebody knows How to export data of elevation profile from .LAS.
> Like this:
> 
> 
> Thanks
> 
> -- 
> Tony Vinicius Moreira Sampaio
> Departamento de Geografia - UFPR
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Re: [Qgis-user] Exporting QGIS to AutoCAD DXF in Metric Units

[Nicolas Cadieux via Qgis-user]

Hi,

DXF file, to my knowledge have no unit information.  Unit is defined in 
AutoCad.  Various version of AutoCad have their own way of doing this. 
EPSG 26917 is in meters therefore the export unit will be meters.


Nicolas

On 2022-10-03 3:13 p.m., Wong, Gordon via Qgis-user wrote:


Hi QGIS team,

I am currently using QGIS 3.16.16. My data are typically represented 
by contours and they are in metres. I always use the coordinate system 
EPSG 26917 for my work. However, whenever I export the contours using 
the “Save Feature As” function on QGIS to an AutoCAD DXF file. The 
default DXF file is in feet and I have to manually change the units on 
AutoCAD to metric. The scaling of the contours is correct in AutoCAD 
though. Is there any way to make sure the exported DXF is in metric units?


Thank you very much for the help!

Sincerely,

Gordon





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--
Nicolas Cadieux
https://gitlab.com/njacadieux
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Re: [Qgis-user] large DEM not loading tiles correctly

[Nicolas Cadieux via Qgis-user]

Hi,

The asc format is very inefficient and  bad for this.  I would save those as 
uncompressed tiff.  One way is to make a virtual raster and then save the 
result as a tiff.  If the data is too big building a pyramid can speed thing 
up.  Keep in mind windows does have a limite to hoe many layers (files) can be 
opened at a time. You can save a very big virtual raster as multiple bigger 
tiles also.  Learning some basic Gdal command line and or python can help you 
al long way for this type of project, specially if you need to convert 
thousands of tile.  If you need help with this, contact me. Of course, server 
and database people will also have their solutions for this problem… it depends 
on what you what to do with the data.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 28 sept. 2022 à 07:33, Michael.Dodd via Qgis-user 
>  a écrit :
> 
> 
> I am trying to put together the 50m uk DEM e.g. 
> https://www.data.gov.uk/dataset/835cf20a-8feb-4394-8b30-dcfe840ac13d/os-terrain-50-dtm
>  but it often does not work.  The data are supplied as thousands of small 
> tiles that takes ages to unpack and put into a folder to get into qgis, 
> however when you try to load the tiles some work and others don’t and even 
> the ones that do work and display fine sometimes don’t merge to form large 
> tiles and sometimes will form virtual rasters but not merged files.  
> Basically it is a mess.  I suspect others have done this successfully so any 
> suggestions?
> It is particularly odd that some of the tiles will merge and others won’t and 
> that some won’t display if you ask it to load hundreds at a time but if you 
> just add them in a few at a time then they will load and display (in addition 
> to the hundreds already loaded). This suggests various bugs assuming the 
> original data are not in a whole variety of slightly different formats 
> (should all be .asc)
>  
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Re: [Qgis-user] Lat Lon Tools Gets New Capabilities

[Nicolas Cadieux via Qgis-user]

Impressive…

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 27 sept. 2022 à 07:45, C Hamilton via Qgis-user 
>  a écrit :
> 
> 
> Yesterday, Lat Lon Tools was updated to version 3.6.5 
> (https://plugins.qgis.org/plugins/latlontools/). This release includes the 
> following:
> 
> 1. Lat Lon Tools can now snapshot H3 geohash coordinates and zoom to H3 
> coordinates. H3 is a fantastic library that I have started working with, but 
> you currently need to 'pip install h3' from the OSGeo4W Shell to get this 
> capability. Lat Lon Tools detects whether H3 is available or not and works as 
> it always has without it.
> 2. Some coordinate formats represent a point on the earth's surface where 
> others represent an area. Previously when using Lat Lon Tools' zoom to a 
> coordinate tool it would zoom to the location and add a marker at the center 
> of area coordinate formats. Now it marks the center but also displays the 
> actual area the coordinate represents based on the resolution of the 
> coordinate. This applies to H3, Geohash, Google Open Location Code (Plus 
> Codes), and the amateur radio Maidenhead grid format. I would like to apply 
> this to MGRS and UTM, but the MGRS library was developed by the defunct 
> Boundless geo and there is no function to return the boundary. The same is 
> true with my implementation of UTM.
> 3. You can now choose the color of the marker used with the zoom to tool. It 
> can be selected from the Settings dialog.
> 
> Enjoy,
> 
> Calvin
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Re: [Qgis-user] Problems with raster layer in geopackage

[Nicolas Cadieux via Qgis-user]

Hi,

Look's like the layer manager in QGIS has got files names, layer names 
and aliases all mixed up for rasters in gpkg. When renaming the raster 
in the layer manager, one only changes the layer alias so the original 
file name and layer name remain the unchanged, thus, you can't copy the 
raster over itself as only file name and layer names are used.  I guess 
you can only delete the raster using the database tool as opening it in 
the file browser will automatically lock the file for reading, which 
makes sense.


This looks like a good bug report...

Nicolas

On 2022-09-23 11:54 p.m., David Strip wrote:

On 9/23/2022 9:59 AM, Nicolas Cadieux wrote:
Am afraid to notice we have not solve your initial issue about naming 
the rasters… :( When you look at the geopackage with the database 
tool,  is the layer with the raster identified with the correct name? 
 What happens to the raster name if you save 2 rasters in the 
geopackage?  This could be an issue with the naming conventions of 
the layer manager instead of an issue with the file format… 
When I look at the gpkg with DB Browser for SQLite, the table 
associated with the raster layer has the correct name, but when I open 
the gpkg in the Qgis browser, it has the same name as the gpkg.
What's odder is that I then added that raster to a different gpkg (one 
that I created for the testing in the last email), and it keeps the 
name, which is to say the name of the gpkg. I added that raster to a 
blank map and renamed it. I then dragged it into the test gpkg, and 
now it has the new name.  So now I try to copy the renamed layer into 
the original gpkg where is has the wrong name and get an error that I 
can't copy the raster over itself (I used the original name). Even 
with a different name I can't add it to the gpkg, as it appears to be 
recognized as the original file. After backing up the gpkg, I thought 
I'd delete the misnamed file and restore it from the project I added 
it to. But you can't delete a raster from a gpkg if it's open in a 
project. I'm baffled.



--
Nicolas Cadieux
https://gitlab.com/njacadieux

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Re: [Qgis-user] Problems with raster layer in geopackage

[Nicolas Cadieux via Qgis-user]

Hi,

I would not store raster in a geopackage unless it’s just a pretty picture.  
The default compression for that format is not lossless.  I would just save as 
a .tiff. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 1 sept. 2022 à 23:33, David Strip via Qgis-user 
>  a écrit :
> 
>  I have a geopackage called GMU5ab. I also have a map project called GMU5ab, 
> which is stored in that geopackage. With the GMU5ab project open in QGIS,  I 
> created a hillshade layer, called "Hillshade" in the layer list. I saved this 
> layer to the geopackage. Unlike a vector layer which is stored with the 
> legend name, the layer in the geopackage was stored as GMU5ab and has a 
> raster icon. If I right click on a vector layer in a geopackage in the 
> browser, I have the choice of Manage->Rename Layer, but if I right click on 
> the raster layer, Manage only offers delete.
> 
> Is there a way to store the raster layer with the correct name in the first 
> place using Qgis?
> Once stored, is there a way to rename a raster layer in a geopackage from 
> within Qgis.
> 
> QGIS 3.26 on Windows 10
> 
> Thanks
> 
> 
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Re: [Qgis-user] Hire a QGIS Contractor

[Nicolas Cadieux via Qgis-user]

Funny message! :) What are you looking for exactly!

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 9 sept. 2022 à 13:13, Dennis Burgess via Qgis-user 
>  a écrit :
> 
> 
> Looking for a contractor that can either speak with us and/or exchange emails 
> in English for QGIS .    Anyone please hit me off-list 
>  
>  
> 
> Dennis Burgess
> 
> Mikrotik : Trainer, Network Associate, Routing Engineer, Wireless Engineer, 
> Traffic Control Engineer, Inter-Networking Engineer, Security Engineer, 
> Enterprise Wireless Engineer
> Hurricane Electric: IPv6 Sage Level
> Cambium: ePMP
>  
> Author of "Learn RouterOS- Second Edition”
> Link Technologies, Inc -- Mikrotik & WISP Support Services
> Office: 314-735-0270  Website: http://www.linktechs.net
> Create Wireless Coverage’s with www.towercoverage.com
> Need MikroTik Cloud Management: https://cloud.linktechs.net
> How did we do today?
> 
> 
> 
> 
>  
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Re: [Qgis-user] Faster Intersects

[Nicolas Cadieux via Qgis-user]

Hi,
Geopackage has a build in index. So you don’t need to build it.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 9 sept. 2022 à 13:50, Raymond Nijssen via Qgis-user 
>  a écrit :
> 
> Great! \o/
> 
> 
>> On 09-09-2022 19:25, Dennis Burgess wrote:
>> That did it!!!  I was unware that GeoPackage’s are SUPER fast and that I 
>> could SAVE a CSV as a GeoPackage file. . There is no metho to create indexes 
>> though once I do this, but now it runs in about 2 min!  lol
>> *LTI-Full_175px*
>> *Dennis Burgess*
>> *
>> *Author of "Learn RouterOS- Second Edition”
>> *Link Technologies, Inc*-- Mikrotik & WISP Support Services
>> *Office*: 314-735-0270  Website: http://www.linktechs.net 
>> 
>> Create Wireless Coverage’s with www.towercoverage.com 
>> Need MikroTik Cloud Management: https://cloud.linktechs.net 
>> 
>> *From:* Alexandre Neto 
>> *Sent:* Friday, September 9, 2022 12:20 PM
>> *To:* Dennis Burgess 
>> *Cc:* Raymond Nijssen ; QGIS User 
>> 
>> *Subject:* Re: [Qgis-user] Faster Intersects
>> Following raymond advice,
>> Move the CSV to a shapefile or geopackage and run the create spatial index 
>> on it.
>> If you have very complex polygons, use suvdivide to create smaller ones save 
>> it in shapefile or geopackage and run create spatial index on it.
>> https://docs.qgis.org/3.22/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#subdivide
>>  
>> 
>> I would try with a smaller subset of points to test the improvement speed 
>> before trying to run on the full dataset again.
>> Answering your question, yes I am pretty sure postgis is much faster than 
>> mssql, and yes I think most recent versions of PostgreSQL PostGIS make use 
>> of more than one core.
>> Good luck
>> A sexta, 9/09/2022, 17:59, Dennis Burgess via Qgis-user 
>> mailto:qgis-user@lists.osgeo.org>> escreveu:
>>In the format, are you talking about the shape or the CSV with
>>2million lines?
>>Dennis Burgess
>>Author of "Learn RouterOS- Second Edition”
>>Link Technologies, Inc -- Mikrotik & WISP Support Services
>>Office: 314-735-0270  Website: http://www.linktechs.net
>>
>>Create Wireless Coverage’s with www.towercoverage.com
>>
>>Need MikroTik Cloud Management: https://cloud.linktechs.net
>>
>>-Original Message-
>>From: Qgis-user >> On Behalf Of Raymond
>>Nijssen via Qgis-user
>>Sent: Friday, September 9, 2022 11:11 AM
>>To: qgis-user@lists.osgeo.org 
>>Subject: Re: [Qgis-user] Faster Intersects
>>Some things to check:
>>* Is your data local?
>>* Is it in a fast file format? (for example .gpkg or .shp and not
>>.csv or .geojson)
>>* Does the data have a spatial index?
>>* Is the geometry very complicated, like a huge multi polygon with
>>thousands of vertices and islands? In that case, split it up in
>>several polygons.
>>Hope this helps. Anyway, it should not need to take this long.
>>Raymond
>>On 09-09-2022 16:28, Dennis Burgess via Qgis-user wrote:
>> > How can I speed up Intersects?  Right now I have a single geometry
>> > file, but then have about 2 million points that I need to understand
>> > what intersects that geometry.  Right now its taking 3 days?
>> > QGIS-bin.exe is only using 11% CPU.. ☹
>> >
>> > Dennis
>> >
>> >
>> > ___
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>> > Qgis-user@lists.osgeo.org 
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>>
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Re: [Qgis-user] Counting of bridges on road.

[Nicolas Cadieux via Qgis-user]

Hi,

You can use the field statistics function found in processing.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 4 août 2022 à 01:01, Paul N via Qgis-user  a 
> écrit :
> 
> 
> Hi,
> I have road layer and segment the road where bridge exist by a field 'bridge' 
> =T in road layer.
> 
> I am able to count number of bridges using 
> count("bridge", filter:="bridge"='T').
> 
> How to count the number of bridges on selected roads?
> 
> Any clue?
> 
> Regards
> Paul 
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Re: [Qgis-user] Convert huge shapefile to small size

[Nicolas Cadieux via Qgis-user]

Hi,

There is a distinct possibility that the 5GB shape file is corrupt or that it 
will be if you manipulate it.  It’s too big for the normal shape file format.  
I would first save it as a geopackage then stat looking at why the file is so 
big.  

Unless shapes can be simplified without loosing resolution (keep a back up 
always), you might have to split the file using a field to make multiple files 
(example splitting a lake file by state).  You may look at the data types.  
Perhaps they can be simplified (ex int16 vs float64 for a filed that has no 
decimal values…

Try compressing the resulting file.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 27 juill. 2022 à 22:47, krishna Ayyala via Qgis-user 
>  a écrit :
> 
> 
> 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

[Nicolas Cadieux via Qgis-user]

Hi Chris,

Dimensions here are not annotations.  I believe the original post was 
referring to what AutoCad refers to as "Extrude" as seen here 
https://www.youtube.com/watch?v=PdysbeHHXo8.


Cheer!

Nicolas

On 2022-06-24 3:18 p.m., chris hermansen wrote:

Nicolas, everyone,

Sorry to top post here but I'm not sure where to start below.

What about just using the various drawing tools on the print layout?  
Arrows can be added, annotation, polylines, that sort of thing?  Of 
course it's not in the original data / layers, but is that important?


On Fri, Jun 24, 2022 at 9:27 AM Nicolas Cadieux via Qgis-user 
 wrote:


Hi,

Qgis is not a CAD as you are discovering.  Others have given you
good plugins and tools so I will not add to that.  You can still
do “3D” as 3D objects like lines, points and polygon are
supported.  You can use the 3D map windows to visualize the 3D
objects and a DEM  raster or mesh layers.  I too am an
archaeologist.  In the past, I have used simple 3D WKT format in a
text file to make 3D outlines of trenches and survey holes. Looks
like some plugins can now do that for you now.  QGIS is not quite
there as a full blown CAD but it’s as good as current Commercial
GIS I have worked with.  Progress has been slow but steady.

Nicolas Cadieux
https://gitlab.com/njacadieux


Le 24 juin 2022 à 08:03, Zoltán Siki via Qgis-user
 a écrit :


you can solve it using Geometry Generator see:
https://stuyts.xyz/2018/11/05/qgis-geometry-generator-examples-repository/


Regards,
Zoltan


IainS via Qgis-user  ezt írta
(időpont: 2022. jún. 23., Cs, 23:44):

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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-- 
Üdv.

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

C'est ma façon de parler.


--
Nicolas Cadieux
https://gitlab.com/njacadieux
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Re: [Qgis-user] reduce resolution of an image in qgis

[Nicolas Cadieux via Qgis-user]

Hi,

Others are responding to your question with methods and tools.  I will just 
state that your question is absolutely valid and is not often looked at 
carefully by researchers.

The question is “how do I resample my data and conserve the best possible 
integrity of this data?”  That will depend on the data, the methods available 
to you, the technical obstacles (like processing time) and the questions you 
are asking.  

Whatever method you use, you better be ready to justify and explain your 
choices.  Do some test data, explore what happens to the data.  What is the 
edge effect…. In statistics, the best choice is often dictated by matching a 
statistical method that behaves like the thing you are trying to studying.

Wise question. Yoda would be proud! May the force be with you! :)

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 23 juin 2022 à 14:51, carlos h via Qgis-user  a 
> écrit :
> 
> 
> 
> Hello, I have an NDVI image that has a pixel of 4 centimeters, that is, 16 
> square centimeters.
> 
> I have 2 doubts:
> 
> 1. What method can I use to generalize the NDVI image to 1 square meter in 
> pixel size?
> 
> 2. When generalizing the NDVI image to 1 square meter per pixel, what value 
> does that new pixel take? the mean value of all pixels in 1 square meter? the 
> maximum value of the pixels? etc, I ask this because if the original NDVI 
> image has a pixel of 4 centimeters (16 cm2), in 1 square meter there are more 
> or less 625 pixels, then what pixel value does it take if it is generalized 
> to 1 square meter? the average? the maximum value?
> 
> 
> Thank you very much
> 
> Carlos
> 
> 
> 
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Re: [Qgis-user] Dimensioning in QGIS

[Nicolas Cadieux via Qgis-user]

Hi,

Qgis is not a CAD as you are discovering.  Others have given you good plugins 
and tools so I will not add to that.  You can still do “3D” as 3D objects like 
lines, points and polygon are supported.  You can use the 3D map windows to 
visualize the 3D objects and a DEM  raster or mesh layers.  I too am an 
archaeologist.  In the past, I have used simple 3D WKT format in a text file to 
make 3D outlines of trenches and survey holes. Looks like some plugins can now 
do that for you now.  QGIS is not quite there as a full blown CAD but it’s as 
good as current Commercial GIS I have worked with.  Progress has been slow but 
steady.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 24 juin 2022 à 08:03, Zoltán Siki via Qgis-user 
>  a écrit :
> 
> 
> you can solve it using Geometry Generator see: 
> https://stuyts.xyz/2018/11/05/qgis-geometry-generator-examples-repository/ 
> 
> Regards,
> Zoltan
> 
> 
> IainS via Qgis-user  ezt írta (időpont: 2022. jún. 
> 23., Cs, 23:44):
>> 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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>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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> 
> 
> -- 
> Üdv.
> Siki Zoltán
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Re: [Qgis-user] most efficient way to digitize polygons

[Nicolas Cadieux via Qgis-user]

Hi,

Depending on what you are doing and what kind of results you are looking 
for, could you simply use "Polygonize" and then clean those results.  If 
your map are in RGB only, you could do a raster classification analysis 
before hand.  Line would follow pixels at first but those could be fixed 
using various vector tools.


Just a thought!

Nicolas

On 2022-06-16 11:26 a.m., Firstname Lastname via Qgis-user wrote:
i am a qgis newby and i am beginning a large project that involves 
digitizing several geology maps.  i am trying to determine the best 
way to manage the digitizing and avoid extra work.
my question to the group is:  If i have several coloured polygons that 
are adjacent to each other, is there an efficient way to digitize one 
polygon and then use one edge of that polygon for the adjacent polygon 
so that i dont have to redigitize the same edge twice and so that i 
will have precisely overrlapping polys with no gaps?  should i 
digitize one polygon, export and rename it?  can i digitize one have 
of the next polygon and somehow merge it with the now re-imported 
polygon?

is there a more efficient way to do this?

many thanks

--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com


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Re: [Qgis-user] digitizing

[Nicolas Cadieux via Qgis-user]

Hi,

Look's like there's a problem with the georeferenced layer or perhaps 
the CRS or the coordinates of the base map.


The first thing would be to look at the layer CRS to see if it's good.  
Then, right click on that layer in the layer panel, go to Layer CRS and 
then select "Set Project CRS from layer.", then zoom to the layer.  I 
would look at the coordinates to see if they are valid.  Then, I would 
open the base map and check the same things.  I would also try to use a 
web mapping service site google earth to see if you base map is in the 
right place.  Perhaps the base map CRS is problematic.


That would be my starting point for trouble shooting.

Nicolas

On 2022-06-16 12:23 p.m., Firstname Lastname via Qgis-user wrote:
i have been successfully using the georeferencer for some time.  i 
referenced several maps and they succesfully georeferenced 
and  displayed for me.
Then, i was digitizing and i ran the georeference tool and for some 
reason, the new referenced maps do not display.  i have exited and 
tried to georef in a new project and made sure that i have the same 
CRS for the basemap and the georef tool but when i run the referencer, 
the layer appear but the map will not display.  i have tried 
restarting, clearing the georef tool and running again but i get the 
same result.  Does anyone know what i am doing wrong and why my 
referenced maps will not display?


--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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--
Nicolas Cadieux
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Re: [Qgis-user] how to convert a circular string into a standard linestring?

[Nicolas Cadieux via Qgis-user]

Hi,

Also, if your default file format is .shp, then, they will be converted 
automatically.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 14 juin 2022 à 15:28, Richard Greenwood via Qgis-user 
>  a écrit :
> 
> 
> Perfect, just what I needed. Thanks so much.
> 
>> On Tue, Jun 14, 2022 at 1:23 PM Alexandre Neto  wrote:
>> Hello Richard,
>> 
>> Try to use the densify tools from the processing toolbox. Either densify by 
>> count or densify by interval should work.
>> 
>> https://docs.qgis.org/3.22/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#densify-by-count
>> 
>> The tools can be used as in-place mode, so you can select a specific feature 
>> are run the tools without creating a new layer.
>> 
>> 
>> Alexandre Neto
>> Users support
>> www.qcooperative.net
>> 
>> A terça, 14/06/2022, 19:24, Richard Greenwood via Qgis-user 
>>  escreveu:
>>> I used the Edit menu function "add Circular String" and got just what I 
>>> wanted. But how can I convert it into a regular linestring with a bunch of 
>>> vertices that approximate the curve? Specifically, I need to be able to 
>>> trace the curve with the Split Features tool and trace it when drawing a 
>>> polygon.
>>> 
>>> Thanks
>>> -- 
>>> Richard W. Greenwood
>>> www.greenwoodmap.com
>>> ___
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>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
> 
> 
> -- 
> Richard W. Greenwood
> www.greenwoodmap.com
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Re: [Qgis-user] Interpolation analyses

[Nicolas Cadieux via Qgis-user]

Bonjour,

Go into the plugin menu and make sur you activate the “Processing” plugin.  It 
is a core plugin that is already installed.  That should give you a menu on top 
called processing.  If you click that menu, that should give you access to the 
panel.

https://docs.qgis.org/3.22/en/docs/user_manual/processing/intro.html

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 9 juin 2022 à 15:43, Thibaut Bouveroux  a écrit :
> 
> Thanks a lot!
> Where can I find this "open processing/Raster information » (select "Force 
> computation of the actual min/max values for each band".  add -stats in the 
> additional command-line parameters.) I don’t see that. Sorry I am quite new 
> with QGIS, always used ArcMap but got stuck with this program without a 
> windows laptop.
> 
> Thanks a lot 
> 
> 
> 
>> Le 9 juin 2022 à 2:27 PM, Nicolas Cadieux  a 
>> écrit :
>> 
> 
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Re: [Qgis-user] Interpolation analyses

[Nicolas Cadieux via Qgis-user]

I removed your image as the user group was blocking it.

On 2022-06-09 3:29 p.m., Nicolas Cadieux wrote:


I Forgot to add the user list...

On 2022-06-09 3:27 p.m., Nicolas Cadieux wrote:


Hi,

Notice the selection box besides "Précision".  You will see "Estimée 
(plus rapide)", Change that to "Actual (slower)". Then, if you choose 
min/max, you should see the correct values.  If you don't see the 
correct min-max value, open processing/Raster information/ select 
"Force computation of the actual min/max values for each band".  add 
-stats in the additional command-line parameters.


Bonne Chance

Nicolas Cadieux


On 2022-06-09 11:46 a.m., Thibaut Bouveroux wrote:

Hi Nicolas,

Thanks a lot for your help. I am using the QGIS idk interpolation. I 
think I figured out a way to get the results fitting my data 
adjusting min and max values from the dataset. When I get the 
output, I can change the min and max values in the symbology tab. Is 
that the way you would recommend?


Thanks a lot for your assistance.

Best,




Le 9 juin 2022 à 10:32 AM, Nicolas Cadieux 
 a écrit :


Hi,

It would help if you gave what algorithms you are using.  There is 
a Gdal and a QGIS idw interpolation method and they are not working 
the same way.  Also, QGIS has a quick way of determining the min 
max value that are an estimate of the true values.  Use Gdal info 
with flag -stats to get the true values.  You will find that in the 
processing plugin.


https://gdal.org/programs/gdalinfo.html

Nicolas Cadieux
https://gitlab.com/njacadieux

Le 9 juin 2022 à 10:33, Thibaut Bouveroux via Qgis-user 
 a écrit :


Hi everyone,

I am trying to make an IDW interpolation analyses using salinity 
data in a bay. My values ranges between 0.1 to 13.1 PSU. When 
making my interpolation with 148 data points, the interpolation 
output ranges between 0.0034 to 12.40 and so doesn't fit 100% with 
the dataset. Can someone has na idea why? Using the same data set 
in ArcMap, the interpolation I made ranged between 0.1 and 13.1 
and does fit 100% with my dataset.


Thanks a lot for your assistance,

Best,

Thibaut

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Re: [Qgis-user] Interpolation analyses

[Nicolas Cadieux via Qgis-user]

Hi,

It would help if you gave what algorithms you are using.  There is a Gdal and a 
QGIS idw interpolation method and they are not working the same way.  Also, 
QGIS has a quick way of determining the min max value that are an estimate of 
the true values.  Use Gdal info with flag -stats to get the true values.  You 
will find that in the processing plugin.

https://gdal.org/programs/gdalinfo.html

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 9 juin 2022 à 10:33, Thibaut Bouveroux via Qgis-user 
>  a écrit :
> 
> Hi everyone,
> 
> I am trying to make an IDW interpolation analyses using salinity data in a 
> bay. My values ranges between 0.1 to 13.1 PSU. When making my interpolation 
> with 148 data points, the interpolation output ranges between 0.0034 to 12.40 
> and so doesn't fit 100% with the dataset. Can someone has na idea why? Using 
> the same data set in ArcMap, the interpolation I made ranged between 0.1 and 
> 13.1 and does fit 100% with my dataset.
> 
> Thanks a lot for your assistance,
> 
> Best,
> 
> Thibaut
> 
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Re: [Qgis-user] How-to-Batch_convert the Spatial resolution of a set of >100 Geotiff files from 500m to 1000m

[Nicolas Cadieux via Qgis-user]

Hi,

What ever you do, make sure you use the correct resampling method in all your 
datasets.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 31 mai 2022 à 15:42, Nicolas Cadieux  a écrit 
> :
> 
> Hi,
> 
> I think you need a 64bit version of Windows…. Make sure it’s compatible with 
> Windows 7.  You may need Windows 10 because of the latest versions of Python…
> 
> Nicolas Cadieux
> https://gitlab.com/njacadieux
> 
>>> Le 31 mai 2022 à 15:38, Amal Kar via Qgis-user  
>>> a écrit :
>>> 
>> 
>> THANK YOU VERY MUCH, SIR!
>> I shall first replace my present QGIS software (ver. 3.18.2, Zurich) with  
>> the new one (ver. 3.24), and then use the procedure for batch processing. 
>> Hope the new version runs on my old Windows 7.
>> Thanks again for the tips.
>> Regards,
>> amal kar.
>> -- -
>> 
>>> On Tue, 31 May 2022 at 21:28, Randal Hale  
>>> wrote:
>>> Depending on which version of QGIS you have (3.22, 3.24  - you can select 
>>> the "translate" command in the processing toolbox (you'll find that under 
>>> gdal -> raster conversion) and either right click the tool and run as batch 
>>> process or in 3.24 you can select the batch button from the translate menu. 
>>> 
>>> You can grab all the imagery from a directory and convert it. I will admit 
>>> that batch processing does throw me off just a bit - BUT - work with it and 
>>> it should do what you want. 
>>> 
>>> Randy
>>> 
>>> On 5/31/22 11:28, Amal Kar via Qgis-user wrote:
 Hello,
 I am new to QGIS. 
 Recently i downloaded a set of MODIS Terra surface reflectance Daily data 
 for a fixed rectangular area of my interest (118 daily files for each of 
 the bands 1-4 and for years 2000-2020), using the AppEEARS tool 
 (NASA-USGS-LP DAAC) in geotiff format (WGS 84; LatLong). 
 I wanted to convert the original data in 500 m spatial resolution
 (0.0041667 arc deg; 2985 col x 1671 row for each scene) to 1 km resolution 
 (0.0083 arc deg; 1493 col x 836 row), so that i am able to create 
 Max.value (& Min. value) Composites (MVCs) for consecutive 8-Day periods 
 at 1 km resolution and then analyse the data sets for matching with other 
 8-Day data series available  at 1 km resolution from Modis Terra sites. 
 No downloaded data from AppEEARS is automatically 'imported" to my Idrisi 
 software (neither geotiff, nor netCDF; same is the case with my 
 GlobalMapper 8.0 software also; the same formats from other sites get 
 converted easily). The file format could be read in my QGIS Desktop 
 software (ver. 3.18.2; Zurich), and then exported either in geotiff or 
 other formats (incl. idrisi) in whatever  resolution, etc., i chose. 
 Although i am doing it file by file, this is a huge back-breaking 
 pre-processing task. 
 I was thinking if there is any tool in QGIS for automatic batch processing 
 of the data (say, 50 or 100 at one time, once i select the "Raster 
 datasets" and  "add" them in the given Box under "Data Source Manager"). 
 Presently, after adding the datafiles, i have to select one raster image 
 at a time and "Export" it with the desired resolution/ file format, etc. 
 It helps if i am able to select all the files together, give one output 
 resolution value and one desired file format for all the files to be 
 processed). It also helps if the output data file uses the same name as 
 given for the input file, but allows the user to provide a short prefix to 
 each of them (say 4-6 letters, either replacing the first 4-6 ones, or 
 adding to the given names).  
 Once i am able to pre-process the data quickly, i am thinking of trying my 
 QGIS for cloud removal (by providing a zero, No Data value to the cloud 
 pixels) and then try it for getting MVCs for consecutive 8-day periods.
 Thanks for your patience, and kind regards,
 amal kar.
 
 -- 
 Dr. Amal Kar
 Former Principal Scientist and Head, Division of Natural Resources & 
 Environment,
 Central Arid Zone Research Institute, Jodhpur 342003, India
 A-1/6, Baitalik Housing Society, KMDA Housing Complex,
 Baghajatin (Near Hiland Park),
 KOLKATA 700 094, India
 Email: akarca...@gmail.com
 
 
 
 
 ___
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 List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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>>> -- 
>>> -
>>> Randal Hale
>>> rjh...@northrivergeographic.com
>>> https://www.northrivergeographic.com
>> 
>> 
>> -- 
>> Dr. Amal Kar
>> Former Principal Scientist and Head, Division of Natural Resources & 
>> Environment,
>> Central Arid Zone Research Institute, Jodhpur 342003, India
>> A-1/6, Baitalik Housing Society, KMDA Housing Complex,
>> Baghajatin (Near Hiland Park),
>> KOLKATA 700 

Re: [Qgis-user] How-to-Batch_convert the Spatial resolution of a set of >100 Geotiff files from 500m to 1000m

[Nicolas Cadieux via Qgis-user]

Hi,

I think you need a 64bit version of Windows…. Make sure it’s compatible with 
Windows 7.  You may need Windows 10 because of the latest versions of Python…

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 31 mai 2022 à 15:38, Amal Kar via Qgis-user  a 
> écrit :
> 
> 
> THANK YOU VERY MUCH, SIR!
> I shall first replace my present QGIS software (ver. 3.18.2, Zurich) with  
> the new one (ver. 3.24), and then use the procedure for batch processing. 
> Hope the new version runs on my old Windows 7.
> Thanks again for the tips.
> Regards,
> amal kar.
> -- -
> 
>> On Tue, 31 May 2022 at 21:28, Randal Hale  
>> wrote:
>> Depending on which version of QGIS you have (3.22, 3.24  - you can select 
>> the "translate" command in the processing toolbox (you'll find that under 
>> gdal -> raster conversion) and either right click the tool and run as batch 
>> process or in 3.24 you can select the batch button from the translate menu. 
>> 
>> You can grab all the imagery from a directory and convert it. I will admit 
>> that batch processing does throw me off just a bit - BUT - work with it and 
>> it should do what you want. 
>> 
>> Randy
>> 
>> On 5/31/22 11:28, Amal Kar via Qgis-user wrote:
>>> Hello,
>>> I am new to QGIS. 
>>> Recently i downloaded a set of MODIS Terra surface reflectance Daily data 
>>> for a fixed rectangular area of my interest (118 daily files for each of 
>>> the bands 1-4 and for years 2000-2020), using the AppEEARS tool 
>>> (NASA-USGS-LP DAAC) in geotiff format (WGS 84; LatLong). 
>>> I wanted to convert the original data in 500 m spatial resolution
>>> (0.0041667 arc deg; 2985 col x 1671 row for each scene) to 1 km resolution 
>>> (0.0083 arc deg; 1493 col x 836 row), so that i am able to create 
>>> Max.value (& Min. value) Composites (MVCs) for consecutive 8-Day periods at 
>>> 1 km resolution and then analyse the data sets for matching with other 
>>> 8-Day data series available  at 1 km resolution from Modis Terra sites. 
>>> No downloaded data from AppEEARS is automatically 'imported" to my Idrisi 
>>> software (neither geotiff, nor netCDF; same is the case with my 
>>> GlobalMapper 8.0 software also; the same formats from other sites get 
>>> converted easily). The file format could be read in my QGIS Desktop 
>>> software (ver. 3.18.2; Zurich), and then exported either in geotiff or 
>>> other formats (incl. idrisi) in whatever  resolution, etc., i chose. 
>>> Although i am doing it file by file, this is a huge back-breaking 
>>> pre-processing task. 
>>> I was thinking if there is any tool in QGIS for automatic batch processing 
>>> of the data (say, 50 or 100 at one time, once i select the "Raster 
>>> datasets" and  "add" them in the given Box under "Data Source Manager"). 
>>> Presently, after adding the datafiles, i have to select one raster image at 
>>> a time and "Export" it with the desired resolution/ file format, etc. It 
>>> helps if i am able to select all the files together, give one output 
>>> resolution value and one desired file format for all the files to be 
>>> processed). It also helps if the output data file uses the same name as 
>>> given for the input file, but allows the user to provide a short prefix to 
>>> each of them (say 4-6 letters, either replacing the first 4-6 ones, or 
>>> adding to the given names).  
>>> Once i am able to pre-process the data quickly, i am thinking of trying my 
>>> QGIS for cloud removal (by providing a zero, No Data value to the cloud 
>>> pixels) and then try it for getting MVCs for consecutive 8-day periods.
>>> Thanks for your patience, and kind regards,
>>> amal kar.
>>> 
>>> -- 
>>> Dr. Amal Kar
>>> Former Principal Scientist and Head, Division of Natural Resources & 
>>> Environment,
>>> Central Arid Zone Research Institute, Jodhpur 342003, India
>>> A-1/6, Baitalik Housing Society, KMDA Housing Complex,
>>> Baghajatin (Near Hiland Park),
>>> KOLKATA 700 094, India
>>> Email: akarca...@gmail.com
>>> 
>>> 
>>> 
>>> 
>>> ___
>>> Qgis-user mailing list
>>> Qgis-user@lists.osgeo.org
>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>> -- 
>> -
>> Randal Hale
>> rjh...@northrivergeographic.com
>> https://www.northrivergeographic.com
> 
> 
> -- 
> Dr. Amal Kar
> Former Principal Scientist and Head, Division of Natural Resources & 
> Environment,
> Central Arid Zone Research Institute, Jodhpur 342003, India
> A-1/6, Baitalik Housing Society, KMDA Housing Complex,
> Baghajatin (Near Hiland Park),
> KOLKATA 700 094, India
> Email: akarca...@gmail.com
> 
> 
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Re: [Qgis-user] .shp layer vs vector layer

[Nicolas Cadieux via Qgis-user]

Hi,

In the layer manager, is the shapefile on top of the wms layer? If you 
click on the layer and then use zoom to layer extent, do you see your 
data?  Is is correctly georeferenced?


Nicolas

On 2022-05-25 12:14 p.m., Theo Stevens via Qgis-user wrote:

Dear all

I have only been a Qgisp user since March 2022 and I am now trying to 
post my data via Qgis2web on the web.
.shp files remain visible but with a vector layer CartoWebb-topo with 
URL https://cartoweb.wms.ngi.be/service?version=1.3.0 is not visible 
in the picture.

What am I doing wrong or should the vector layer become an shp file.

Kind regards

Theo Stevens

Local History Ham


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Re: [Qgis-user] Raster

[Nicolas Cadieux via Qgis-user]

Hi,


Another way is to add an alpha band to the image.  I generally use GIMP 
to do this.  If the Georeferencer sees and alpha band, then, the border 
will use this band.



Nicolas

On 2022-05-24 7:25 a.m., Richard McDonnell via Qgis-user wrote:


Easiest way I can think of doing what you want is to create a VRT of 
the three raster’s.


*Raster*è*Miscellaneous* è*Build Virtual Raster*

When you do this set the *Nodata value* to 0 (the default transparent 
value form the Georeference Tool)


This should create a merged raster for you and allow you to use the 
correct transparency value.


Hope this helps,

Richard


——
Richard McDonnell MSc GIS, FME Certified Professional
/FRM Data Management/

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
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——
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Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
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*From:*Qgis-user  *On Behalf Of 
*Lazanu Ciprian-Catalin via Qgis-user

*Sent:* 24 May 2022 11:53
*To:* Uwe Fischer via Qgis-user ; Uwe 
Fischer via Qgis-user 

*Subject:* [Qgis-user] Raster

Hello,

I georeferenced three maps ... all good, quite easy by using points 
from map canvas. When my map was ready it has a black border (image 
1). This is solved by ~Custom transparency options~, and a black 
border disappears. But this solution is just temporarily, because if I 
close and reopen ... that raster has again a black border. I want to 
merge the three maps in one, but it does with a black border between 
maps.


A solution to this annoying problem?

Thank you

https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing 
 images


Meet Google Drive – One place for all your files 



Google Drive is a free way to keep your files backed up and easy to 
reach from any phone, tablet, or computer. Start with 15GB of Google 
storage – free.


drive.google.com


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Re: [Qgis-user] issue with ”Task complete: Counting features in...”

[Nicolas Cadieux via Qgis-user]

Hi,

I have been using the Atlas features lately.  The legend is indeed very slow 
when you activate various functions like show only features on the map.  This 
does require the legend to look at the fields defending on the layer styles and 
then check what is on the map.  This is very slow.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 16 mai 2022 à 16:40, Alexandru Munteanu  a écrit 
> :
> 
> 
> Hi all,
> Thank you for the tips! Unfortunately nothing worked. 
> In the main window, feature counting in layers is not activated, nor it is 
> active in the legend in the print layout. 
> A new user with no plugins installed also didn't give any improvements.
> 
> I'm thinking it might be something related with the print layout because it 
> mainly counts features when i edit the legend or change the scale of the map. 
> 
> Best,
> A
> 
>> On Mon, May 16, 2022, 22:39 Nicolas Cadieux  
>> wrote:
>> Hi,
>> 
>> Follow the tips other have given you.  Also, disable all plugins, try 
>> creating a new user profile.
>> 
>> Nicolas Cadieux
>> https://gitlab.com/njacadieux
>> 
 Le 16 mai 2022 à 05:43, Alexandru Munteanu  a 
 écrit :
 
>>> 
>>> Thank you, Nicolas, for your reply!
>>> 
>>> Yes, the project is on drive, with offline access. We use it so we can work 
>>> remotely.
>>> 
>>> I have tried the following:
>>> 1. I copied the project on computer - it didn't work 
>>> 2. deleted the wms layers - no luck 
>>> 3. also tried to reduce the number of layers to have only the layers i use 
>>> for a print layout - it still freezes and sometimes (not always) counts the 
>>> features.
>>> 
>>> Also, another problem is when i save the project and close it - i have to 
>>> forcibly shut it as it also freezes and wont close on its own. 
>>> 
>>> Maybe i am doing something wrong, i don't know.
>>> 
>>> Best,
>>> Alexandru
>>> 
>>> 
>>> 
>>> On 14.05.2022 18:43, Nicolas Cadieux wrote:
 Hi,
 
 I suspect the wms server is possibly causing this slowdown. Have you tried 
 the same project without the wms layers?  Are the other layer stored 
 locally or on a file server?  That could also cause a slowing down.
 
 Nicolas Cadieux
 https://gitlab.com/njacadieux
 
> Le 14 mai 2022 à 11:01, Alexandru Munteanu via Qgis-user 
>  a écrit :
> 
> 
> Hello, 
> 
> I am encountering an issue that dramatically slows down the work flow in 
> qgis. I am using the version 3.24. 
> My project consists of more then 100 layers, both shp and wms. These 
> projects are city master plans, an they are quite bulky, data wise.
> 
> The issue is that every time i make an operation, the program runs a 
> process ending with the message ”Task complete: Counting features in 
> ...(layer)”. This especially happens when i compile print layouts and 
> edit anything in the print layout. When this happens the program freezes 
> to points when i have to forcibly restart the program.
> 
> Did anyone encounter similar problems? Is there way around that? Can i 
> make it stop counting the features?
> Or maybe do you have tips on how i can change the work flow? 
> The idea is that when i finish the project i should print around 15 
> thematic layouts. 
> 
> Thank you for any info you could provide me on that!
> Best, 
> Alexandru
> 
> -- 
> Alexandru Munteanu
> Centre of Urbanism, co-founder, president
> MSc. in International Cooperation in Urban Development
> MSc. in Urbanism, Habitat and International Cooperation
> aldru.munte...@gmail.com
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>>> -- 
>>> Alexandru Munteanu
>>> Centre of Urbanism, co-founder, president
>>> MSc. in International Cooperation in Urban Development
>>> MSc. in Urbanism, Habitat and International Cooperation
>>> aldru.munte...@gmail.com
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Re: [Qgis-user] issue with ”Task complete: Counting features in...”

[Nicolas Cadieux via Qgis-user]

Hi,

Follow the tips other have given you.  Also, disable all plugins, try creating 
a new user profile.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 16 mai 2022 à 05:43, Alexandru Munteanu  a écrit 
> :
> 
> 
> Thank you, Nicolas, for your reply!
> 
> Yes, the project is on drive, with offline access. We use it so we can work 
> remotely.
> 
> I have tried the following:
> 1. I copied the project on computer - it didn't work 
> 2. deleted the wms layers - no luck 
> 3. also tried to reduce the number of layers to have only the layers i use 
> for a print layout - it still freezes and sometimes (not always) counts the 
> features.
> 
> Also, another problem is when i save the project and close it - i have to 
> forcibly shut it as it also freezes and wont close on its own. 
> 
> Maybe i am doing something wrong, i don't know.
> 
> Best,
> Alexandru
> 
> 
> 
> On 14.05.2022 18:43, Nicolas Cadieux wrote:
>> Hi,
>> 
>> I suspect the wms server is possibly causing this slowdown. Have you tried 
>> the same project without the wms layers?  Are the other layer stored locally 
>> or on a file server?  That could also cause a slowing down.
>> 
>> Nicolas Cadieux
>> https://gitlab.com/njacadieux
>> 
>>> Le 14 mai 2022 à 11:01, Alexandru Munteanu via Qgis-user 
>>>  a écrit :
>>> 
>>> 
>>> Hello, 
>>> 
>>> I am encountering an issue that dramatically slows down the work flow in 
>>> qgis. I am using the version 3.24. 
>>> My project consists of more then 100 layers, both shp and wms. These 
>>> projects are city master plans, an they are quite bulky, data wise.
>>> 
>>> The issue is that every time i make an operation, the program runs a 
>>> process ending with the message ”Task complete: Counting features in 
>>> ...(layer)”. This especially happens when i compile print layouts and edit 
>>> anything in the print layout. When this happens the program freezes to 
>>> points when i have to forcibly restart the program.
>>> 
>>> Did anyone encounter similar problems? Is there way around that? Can i make 
>>> it stop counting the features?
>>> Or maybe do you have tips on how i can change the work flow? 
>>> The idea is that when i finish the project i should print around 15 
>>> thematic layouts. 
>>> 
>>> Thank you for any info you could provide me on that!
>>> Best, 
>>> Alexandru
>>> 
>>> -- 
>>> Alexandru Munteanu
>>> Centre of Urbanism, co-founder, president
>>> MSc. in International Cooperation in Urban Development
>>> MSc. in Urbanism, Habitat and International Cooperation
>>> aldru.munte...@gmail.com
>>> ___
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>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
> -- 
> Alexandru Munteanu
> Centre of Urbanism, co-founder, president
> MSc. in International Cooperation in Urban Development
> MSc. in Urbanism, Habitat and International Cooperation
> aldru.munte...@gmail.com
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Re: [Qgis-user] The Split Features tool is not working...

[Nicolas Cadieux via Qgis-user]

Hi,

I guess default is to split the shapes into multipart objects.  You can then 
used the multi part to single parts tools.  That will split the geometries and 
create new lines in the database.  Always check for topology errors before and 
after using such tools. The “Fix geometry” tool is good for this sort of thing 
if you find errors.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 16 mai 2022 à 11:16, Erick Castillo Núñez via Qgis-user 
>  a écrit :
> 
> 
> Hi everybody
> 
> I was trying to split some polygons using The Split Features tool, but it is 
> not working properly. Apparently it works as indicated in the manual, even 
> though I've done that procedure some time before, but when it is divided in 
> two parts and I select  individually each polygon, it remains as one and even 
> shows the division line. It produces an error in topology (obviously) that 
> shows in the topology checker tool.
> 
> Has anybody else experienced that issue? Any suggestions?
> 
> Well im using:
> 
> QGIS 3.22.6-Białowieża Code revision QGIS b6f33b1a
> Qt 5.15.2
> Python 3.9.5
> GDAL/OGR 3.4.2
> PROJ 9.0.0
> EPSG v10.041 (2021-12-03)
> GEOS 3.10.2-CAPI-1.16.0
> SQLite 3.38.1
> PDAL 2.3.0
> PostgreSQL 13.0
> SpatiaLite 5.0.1
> QWT 6.1.3
> QScintilla2 2.11.5
> OS Windows 10  2009
> 
> Thank you
> Erick Castillo
> 
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Re: [Qgis-user] How to make joined fields editable?

[Nicolas Cadieux via Qgis-user]

Hi,

I am unsure of what is happening here. I don’t use postgis tables and I 
normally use csv  as join table (therefore not editable from the start).  You 
can however save the 2 joined table as a gpkg under a new name.  Just use the 
export dialogue and both will be saved. This will make a new editable file if 
you use an editable format as an export file format and will get you out of 
this bind. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 15 mai 2022 à 04:25, Roland Berger via Qgis-user 
>  a écrit :
> 
>  Hi, I have a point vector layer A and joined some fields from a table B. 
> Now I would like to edit values in B by looking at the attribute table of A. 
> In the 'Edit Vector Join' Dialog' of A I have ticked the checkbox 'Editable 
> join layer'. If I now try to edit the attribute table of A the joined fields 
> of B are shown but still not editable.
> 
> What does this checkbox 'Editable join layer' in the 'Edit Vector Join' 
> Dialog really do?
> What do I have to do to make joined fields editable?
> 
> Thanks for any help.
> Roland
> 
> Remarks:
> Layer A is in a Postgis database. Table B is in a Geopackage File (gpkg)
> 
> 
> -- 
> 
> 
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Re: [Qgis-user] issue with ”Task complete: Counting features in...”

[Nicolas Cadieux via Qgis-user]

Hi,

I suspect the wms server is possibly causing this slowdown. Have you tried the 
same project without the wms layers?  Are the other layer stored locally or on 
a file server?  That could also cause a slowing down.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 14 mai 2022 à 11:01, Alexandru Munteanu via Qgis-user 
>  a écrit :
> 
> 
> Hello, 
> 
> I am encountering an issue that dramatically slows down the work flow in 
> qgis. I am using the version 3.24. 
> My project consists of more then 100 layers, both shp and wms. These projects 
> are city master plans, an they are quite bulky, data wise.
> 
> The issue is that every time i make an operation, the program runs a process 
> ending with the message ”Task complete: Counting features in ...(layer)”. 
> This especially happens when i compile print layouts and edit anything in the 
> print layout. When this happens the program freezes to points when i have to 
> forcibly restart the program.
> 
> Did anyone encounter similar problems? Is there way around that? Can i make 
> it stop counting the features?
> Or maybe do you have tips on how i can change the work flow? 
> The idea is that when i finish the project i should print around 15 thematic 
> layouts. 
> 
> Thank you for any info you could provide me on that!
> Best, 
> Alexandru
> 
> -- 
> Alexandru Munteanu
> Centre of Urbanism, co-founder, president
> MSc. in International Cooperation in Urban Development
> MSc. in Urbanism, Habitat and International Cooperation
> aldru.munte...@gmail.com
> ___
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> Qgis-user@lists.osgeo.org
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Re: [Qgis-user] Tweaking an Atlas

[Nicolas Cadieux via Qgis-user]

Hi,

This did it

IF (@atlas_featurenumber  = 1,0,1)

Intuition says this should be 1 for include and 0 to exclude but it's 
the contrary.  This is a double negative situation as "Exclude item from 
exports" must be checked as False.


Thanks for the tips!

Nicolas

On 2022-05-11 1:56 a.m., Alexandre Neto wrote:

Hi!

Sorry, I mislead you with a wrong name

It's the "Exclude item from exports"

https://docs.qgis.org/3.22/en/docs/user_manual/print_composer/composer_items/composer_items_options.html#rendering-mode

The data-defined expression expects a true or false (1 or 0) so you 
can use whatever you prefer to check that out. In the limit, you can 
add an extra boolean column to you atlas layer called 
"exclude_overview" and fill in a yes for the features you don't want 
to show a overview. The use that column in the data-defined properties 
of the "exclude item from export"


Alexandre Neto
User Support
www.qcooperative.net <http://www.qcooperative.net>

A quarta, 11/05/2022, 04:18, Nicolas Cadieux 
 escreveu:


Hi Alexandre,

In the layout, under Item Properties/Rendering, I was able to
change the overview map opacity using IF (@atlas_featurenumber =
'1','100','0').  Is there a better method?

Thanks everyone for the tips, I am finally figuring this out slowly.

Nicolas



On 2022-05-10 5:07 p.m., Alexandre Neto wrote:

All items in the layout have a render item in outputs option.
It's data-defined. So you can put a expression like if
@atlas_page in (3,6,9,12)

Alexandre Neto

A terça, 10/05/2022, 21:06, Alexis R.L. via Qgis-user
 escreveu:


You could use the Data-defined variables to move elements in
and out of the page layout depending on the atlas page
name/number.

    Alex


    Le mar. 10 mai 2022 à 13:58, Nicolas Cadieux via Qgis-user
 a écrit :

Hi,

I have a series of map that could work well this an Atlas
but I would
need to add thing like Zoom in or Overview maps on some
specific pages
only.  Can we add objects like new maps on specific pages
of an Atlas?

If not, is there a function or way to go from Atlas page
2  -> New
layout? I figure the only way to do this is to turn on
the Atlas
preview, go to the selected preview, turn the Atlas
preview off and the
save as a new layout? Is there a better way?

-- 
Nicolas Cadieux

https://gitlab.com/njacadieux

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-- 
Nicolas Cadieux

https://gitlab.com/njacadieux


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https://gitlab.com/njacadieux
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Re: [Qgis-user] New objectid numbers after using DIFFERENCE

[Nicolas Cadieux via Qgis-user]

Hi,

If you are using a geopackage, you are probably getting a message that 
the file cannot be saved as geopackage requires a unique id field.   You 
can open the field calculator and update the field using $id  for the 
unique ID field.  If you delete this unique ID field, it will be 
recreated correctly if you delete the field and save the file (if you 
save in a geopackage file format).  (I guess this also has the potential 
to corrupt the file so this would be a last chance option).  You can 
also use the  autoincremental field function found in processing if you 
don't have a unique id field.


Nicolas

On 2022-05-11 5:32 a.m., Keith Trees via Qgis-user wrote:


Sent from Mail  for 
Windows


Hi All

I have two vector polygon layers, soil and native vegetation 
respectively. I used vector-geoprocessing tools-Difference to get the 
output of the soils that had no native vegetation.


The problem is that there are now multiple polygons that share the 
same objectid as they are remnants of an original polygon. This is 
repeated through the layer.


How can I renumber the objectids so each polygon has a unique value?

I need to be able to identify each polygon and also calculate its area.

Regards

Keith


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Re: [Qgis-user] Tweaking an Atlas

[Nicolas Cadieux via Qgis-user]

Hi Alexandre,

In the layout, under Item Properties/Rendering, I was able to change the 
overview map opacity using IF (@atlas_featurenumber = '1','100','0').  
Is there a better method?


Thanks everyone for the tips, I am finally figuring this out slowly.

Nicolas



On 2022-05-10 5:07 p.m., Alexandre Neto wrote:
All items in the layout have a render item in outputs option. It's 
data-defined. So you can put a expression like if @atlas_page in 
(3,6,9,12)


Alexandre Neto

A terça, 10/05/2022, 21:06, Alexis R.L. via Qgis-user 
 escreveu:



You could use the Data-defined variables to move elements in and
out of the page layout depending on the atlas page name/number.

Alex


Le mar. 10 mai 2022 à 13:58, Nicolas Cadieux via Qgis-user
 a écrit :

Hi,

I have a series of map that could work well this an Atlas but
I would
need to add thing like Zoom in or Overview maps on some
specific pages
only.  Can we add objects like new maps on specific pages of
an Atlas?

If not, is there a function or way to go from Atlas page 2  ->
New
layout? I figure the only way to do this is to turn on the Atlas
preview, go to the selected preview, turn the Atlas preview
off and the
save as a new layout? Is there a better way?

-- 
Nicolas Cadieux

https://gitlab.com/njacadieux

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[Qgis-user] Tweaking an Atlas

[Nicolas Cadieux via Qgis-user]

Hi,

I have a series of map that could work well this an Atlas but I would 
need to add thing like Zoom in or Overview maps on some specific pages 
only.  Can we add objects like new maps on specific pages of an Atlas?


If not, is there a function or way to go from Atlas page 2  -> New 
layout? I figure the only way to do this is to turn on the Atlas 
preview, go to the selected preview, turn the Atlas preview off and the 
save as a new layout? Is there a better way?


--
Nicolas Cadieux
https://gitlab.com/njacadieux

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Re: [Qgis-user] help with shortest-path/network analysis (multiple origins to multiple destinations)

[Nicolas Cadieux via Qgis-user]

Hi,

I think the best way is too install Python with Anaconda.  Then, you 
will need to  install geopandas, networkX and possibly pandas and 
shapely libraries.  I am not sure it it's a good idea to add these in 
the Qgis Python distribution.


My algorithm currently uses 1 line input file and 1 point input file. It 
would need to be modified to work with 2 point input files.


Nicolas

On 2022-05-06 10:02 a.m., Francesca Parente wrote:
Thank you very much indeed Nicolas, for your inputs and all the 
suggested materials!
I have 50 targets and 532 origins. My goal is to define where is best 
to go within the 50 destinations for each starting point - given the 
actual range of choices though, so I'm not sure that running a batch 
one-to-many would take into account all the variables properly as a 
many-to-many would do. In the absence of a specific modelling, also 
some second best could work.


I understand that your upstream-downstream-Dijkstra script is suitable 
for layer-to-layer indeed and I'm trying to run it, but at the >>> 
import geopandas as gpd<< line I got the following error message:


/Traceback (most recent call last):
  File "C:\OSGEO4~1\apps\Python37\lib\code.py", line 90, in runcode
    exec(code, self.locals)
  File "", line 1, in 
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 799, in 
_import

    mod = _builtin_import(name, globals, locals, fromlist, level)
/
/ModuleNotFoundError: No module named 'geopandas'/
I've been following your tutorial, but I admit I'm not quite familiar 
with py. I've gone through the remaining import coding and it seems 
working, but I'm not sure the "geopandas" module is needed or not to 
properly complete the script.


Thanks again!!
Best,
Francesca

Il giorno gio 5 mag 2022 alle ore 22:28 Nicolas Cadieux 
 ha scritto:


Hi,

How many shortest path calculations are you looking at? You could
probably do a all pairs shortest path dijkstra and filter the
results.  You could batch multiple one to many (point to layers)
 In QGIS using the processing plug-in.

I did create an algorithm using networkX that could be modified to
work with two input layers.  This could be useful if QGIS is not
fast enough or if you have too many routes to calculate.  You will
find it in the links below. Keep in mind this algorithm was for
rivers therefore you have no trafic rules.  This would need more work.

You will also find an article we wrote in Data that may help.  If
you have trouble with the network, look in the QGIS hub for the
models. Look for the 3 “fix directional networks models”.

I added a few YouTube videos I made.


https://gitlab.com/njacadieux/upstream_downstream_shortests_path_dijkstra

https://www.mdpi.com/2306-5729/5/1/8

https://plugins.qgis.org/models/

https://youtu.be/v61PafSByvM

https://youtu.be/qQrHcKtmr3o


Nicolas Cadieux
https://gitlab.com/njacadieux


Le 5 mai 2022 à 10:38, Francesca Parente via Qgis-user
 a écrit :


Hello everyone,

I'd need to identify optimal destinations (within a point layer
of geolocated facilities) for each territory of a given set of
possible origins.
I already calculated a distance matrix between the two
point-layers, and also applied the distance-to-nearest-hub tool
to generate a string layer and identify the optimal facilities.
But I'd like to obtain a more realistic estimate, accounting for
the roads network (and ideally their travel times). With quite a
few issues, I finally managed to import an OSM road network from
download.geofabrik.de  (in order to
cover my area of interest, I had to merge two different vectors
fo Center and Southern Italy and then extract a focus spot in
between the two and save it as a lighter layer, otherwise it also
took an eternity to run every analysis).

So now my question would be: is there a tool to perform a
layer-to-layer shortest-path analysis that takes it into account?
All that I could find was either point-to-point or
layer-to-point/point-to-layer (I looked also at built-in network
analysis tool and Qneat3 plugin).

Any kind of inputs and suggestions will be more than welcome!
Thanks a lot for your support and have a good day,
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] help with shortest-path/network analysis (multiple origins to multiple destinations)

[Nicolas Cadieux via Qgis-user]

Hi,

How many shortest path calculations are you looking at? You could probably do a 
all pairs shortest path dijkstra and filter the results.  You could batch 
multiple one to many (point to layers)  In QGIS using the processing plug-in.

I did create an algorithm using networkX that could be modified to work with 
two input layers.  This could be useful if QGIS is not fast enough or if you 
have too many routes to calculate.  You will find it in the links below. Keep 
in mind this algorithm was for rivers therefore you have no trafic rules.  This 
would need more work.

You will also find an article we wrote in Data that may help.  If you have 
trouble with the network, look in the QGIS hub for the models. Look for the 3 
“fix directional networks models”.

I added a few YouTube videos I made.

https://gitlab.com/njacadieux/upstream_downstream_shortests_path_dijkstra 

https://www.mdpi.com/2306-5729/5/1/8

https://plugins.qgis.org/models/

https://youtu.be/v61PafSByvM

https://youtu.be/qQrHcKtmr3o


Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 5 mai 2022 à 10:38, Francesca Parente via Qgis-user 
>  a écrit :
> 
> Hello everyone,
> 
> I'd need to identify optimal destinations (within a point layer of geolocated 
> facilities) for each territory of a given set of possible origins. 
> I already calculated a distance matrix between the two point-layers, and also 
> applied the distance-to-nearest-hub tool to generate a string layer and 
> identify the optimal facilities.
> But I'd like to obtain a more realistic estimate, accounting for the roads 
> network (and ideally their travel times). With quite a few issues, I finally 
> managed to import an OSM road network from download.geofabrik.de (in order to 
> cover my area of interest, I had to merge two different vectors fo Center and 
> Southern Italy and then extract a focus spot in between the two and save it 
> as a lighter layer, otherwise it also took an eternity to run every 
> analysis). 
> 
> So now my question would be: is there a tool to perform a layer-to-layer 
> shortest-path analysis that takes it into account? 
> All that I could find was either point-to-point or 
> layer-to-point/point-to-layer (I looked also at built-in network analysis 
> tool and Qneat3 plugin).
> 
> Any kind of inputs and suggestions will be more than welcome! 
> Thanks a lot for your support and have a good day,
> 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] Rendering of Raster image in Map Layout

[Nicolas Cadieux via Qgis-user]

Hi,

You can set the map output resolution. Set to 300dpi or more.

https://docs.qgis.org/3.4/en/docs/training_manual/map_composer/map_composer.html

See if that works.


Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 4 mai 2022 à 08:17, Bibek Rana via Qgis-user  a 
> écrit :
> 
> 
> Dear Sir/Madam,
> I am currently using QGIS 3.22 (long term release).
> I have added a topographic map (geotiff file) to the QGIS map canvas with 
> details in the picture below.
> 
> 
> 
> The map was rendering very fine in the map canvas, i.e. i can zoom it finely 
> to maximum level.
> 
> Then I created a map layout in print composer and rendered the map in map 
> layout in A3 size.
> 
> However, the map looked very blurry in the layout when I tried to zoom in the 
> layout in the print composer.
> 
> Then I tried to export the map to PDF anf JPEG format. But the resolution of 
> the Topo Map (Raster image) was very poor, blurry and pixelated.
> 
> 
> So, it would be really helpful if you could provide me with the solution to 
> this problem.
> 
> Regards,
> Bibek Bikram Rana
> 
> 
> 
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Re: [Qgis-user] How to convert depth belw ground level to depth below mean sea level in QGIS

[Nicolas Cadieux via Qgis-user]

Hi,

In addition, the means sea level is dependent on a model (geiod).  Try to find 
out what “sea level” you need.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 3 mai 2022 à 06:08, kirk via Qgis-user  a écrit 
> :
> 
> 
> Hi Navneet
> 
> This is  classic raster analysis.  You will need the corresponding Digital 
> Elevation File (DEM).  If your water table data are in vector fomat, you will 
> have to rasterize the data, preferably to the same resolution as the dem.  
> Then you can use the grid calculator to subtract the water tabke depth from 
> the dem.  The resulting raster will be your water table height above sea 
> level or the zero reference for the dem. You can contour the raster after 
> that if required.
> 
> Kirk Schmidt
> 
> 
> 
> Sent from my Galaxy
> 
> 
>  Original message 
> From: nr via Qgis-user 
> Date: 2022-05-03 5:08 a.m. (GMT-04:00)
> To: qgis-user@lists.osgeo.org
> Subject: [Qgis-user] How to convert depth belw ground level to depth below 
> mean sea level in QGIS
> 
> Dear friends,
> 
> The data provided for depth of water table in my country by the CGWB is depth 
> below ground level , but for drawing the water table contours in modflow 
> software the depth of water below mean sea level is needed.
> So how the depth below ground level can be converted to depth with reference 
> to mean sea level in QGIS
> 
> Regards
> Navneet
> QGIS user 
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Re: [Qgis-user] Classify road network into dead-end links and links connected on both ends

[Nicolas Cadieux via Qgis-user]

Hi,

Go to https://plugins.qgis.org/models/?order_by=-upload_date&_gallery=true 
and download the 3  “fix directional networks” model.  I created this to 
troubleshoot river network file for people that needed perfectly connected 
network or graph files.  This video should help also  
https://youtu.be/v61PafSByvM. 

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 2 mai 2022 à 04:41, Roland Spielhofer via Qgis-user 
>  a écrit :
> 
> 
> Hi,
> I have a road network (Shape linestring) where I would like to classify all 
> links that are dead-end and compute the share of the dead-end links in 
> relation to the total network length.
> I am pretty sure this is possible in QGIS or a plugin - any pointers would be 
> appreciated.
>  
> Regards,
> Roland
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Re: [Qgis-user] Insert Logo into the map composer

[Nicolas Cadieux via Qgis-user]

Select raster image

On 2022-04-23 2:52 p.m., krishna Ayyala wrote:
Thank you. But that popup window is not allowing me to navigate to any 
jpeg file. only option it has is svg image.

Regards.

On Fri, Apr 22, 2022 at 9:35 AM Nicolas Cadieux 
 wrote:


Hi,


https://docs.qgis.org/3.22/en/docs/training_manual/map_composer/map_composer.html

You will see an Icon on the left (blue sky with a mountain). Or Add
Item/add picture.

Nicolas

On 2022-04-22 9:05 a.m., krishna Ayyala via Qgis-user wrote:
> Hello,
> I have a map in the map composer. How can I insert a logo which
is a
> jpeg image into the map composer?
>
> Regards.
>
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Re: [Qgis-user] Write vector attribute table from pandas dataframe

[Nicolas Cadieux via Qgis-user]

Hi Ming,

The best thing would be to show your code and ask others how it can be 
optimized.  I find that https://gis.stackexchange.com/ is the best place to do 
this but this user list definitely has some very  competent programmers.  Not 
being one of those competent programmers, I will just state that pandas and 
geopandas use a process called vectorization where the “for loop” is done for 
you.  

https://medium.com/analytics-vidhya/understanding-vectorization-in-numpy-and-pandas-188b6ebc5398

This means that looping over elements in a dataframe can be MUCH slower than 
using vectorization.  So basically, you need to figure out the right code and 
avoid “for loops“ when using dataframes.  

Hope this helps

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 22 avr. 2022 à 11:50, ming han via Qgis-user  a 
> écrit :
> 
> 
> Hi everyone 
> 
>  Is there an efficient way to copy data in a pandas dataframe to the 
> vector attribute table? 
> 
>   I am looping element by element, which is very slow. 
> 
> Thanks
> Ming 
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Re: [Qgis-user] Insert Logo into the map composer

[Nicolas Cadieux via Qgis-user]

Hi,

https://docs.qgis.org/3.22/en/docs/training_manual/map_composer/map_composer.html

You will see an Icon on the left (blue sky with a mountain). Or Add 
Item/add picture.


Nicolas

On 2022-04-22 9:05 a.m., krishna Ayyala via Qgis-user wrote:

Hello,
I have a map in the map composer. How can I insert a logo which is a 
jpeg image into the map composer?


Regards.

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Re: [Qgis-user] Activating ESRI geodatabase (.gdb) write mode in QGIS, OGR2OGR or Python

[Nicolas Cadieux via Qgis-user]

Hi,

Does anybody know how "Aliases" are saved in this type of data base?  If 
I import files from a dataset, it has aliases for each layer but they 
are not exported if I create a new "database". Perhaps this feature is 
not fully supported yet as aliases are normally save in the QGIS project 
file?


Thanks for the tips!

Nicolas

On 2022-04-21 9:42 a.m., Mike Treglia via Qgis-user wrote:
That's correct in my experience. In the OSGeo4W installer, go through 
the advanced install menu, and when you get the options for libraries, 
I think searching for gdb should bring up the right one - then check 
the box and proceed.


On Wed, Apr 20, 2022 at 11:22 PM Saulteau Don via Qgis-user 
 wrote:


I think in the osgeo4w installer you just have to install the
gdal-filegdb package for that driver.




Donovan

On Wed., Apr. 20, 2022, 18:11 Nicolas Cadieux via Qgis-user,
 wrote:

Hi,

I am in a bit of a bind.  I am basically trying to figure out
a way to
write some .shp file to a .gbd folder using the gbd drivers
obtained
from ESRI. I am not sure what file to copy and where.  I am
tying to
make this work with ogr2ogr at the dos command prompt but
getting to
work with a anaconda python environment would be nice.

Can the ESRI File Geodatabase API also be used write to a .gdb
file
using QGIS?

If you recently did this, I would appreciate some tips.

I am on windows 10 using the OSGEO4W install with QGIS 3.24.

https://gdal.org/drivers/vector/filegdb.html

Thanks

-- 


Nicolas Cadieux
https://gitlab.com/njacadieux

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Re: [Qgis-user] Activating ESRI geodatabase (.gdb) write mode in QGIS, OGR2OGR or Python

[Nicolas Cadieux via Qgis-user]

Hi,

Thanks for the tip, yesterday, all I had was read but for some reason, I 
can now write so it works perfectly!  Looks like the problem was sitting 
18 inches in front of the screen!


Cheers and thanks for your help!

Nicolas

On 2022-04-20 11:20 p.m., Saulteau Don via Qgis-user wrote:
I think in the osgeo4w installer you just have to install the 
gdal-filegdb package for that driver.





Donovan

On Wed., Apr. 20, 2022, 18:11 Nicolas Cadieux via Qgis-user, 
 wrote:


Hi,

I am in a bit of a bind.  I am basically trying to figure out a
way to
write some .shp file to a .gbd folder using the gbd drivers obtained
from ESRI. I am not sure what file to copy and where.  I am tying to
make this work with ogr2ogr at the dos command prompt but getting to
work with a anaconda python environment would be nice.

Can the ESRI File Geodatabase API also be used write to a .gdb file
using QGIS?

If you recently did this, I would appreciate some tips.

I am on windows 10 using the OSGEO4W install with QGIS 3.24.

https://gdal.org/drivers/vector/filegdb.html

Thanks

-- 


Nicolas Cadieux
https://gitlab.com/njacadieux

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Re: [Qgis-user] Mean distance between points

[Nicolas Cadieux via Qgis-user]

Hi,

Perhaps « Distance Matrix » followed by « basic statistics for field » would 
help.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 21 avr. 2022 à 10:55, Chavoux Luyt via Qgis-user 
>  a écrit :
> 
> 
> Hi everyone,
> 
> I am pretty sure that this is something that is used regularly, but I could 
> not figure out how to do it. Basically we have a bunch of camera points 
> (vector point data layer) and want to calculate the mean distance between the 
> points (as well as the minimum and maximum distance between neighbouring 
> points). Is there a specific tool or plugin that can do this automatically? 
> Obviously I could use the measure line tool and do it manually as a last 
> resort, but I would prefer not.
> 
> Cheers,
> Chavoux
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[Qgis-user] Activating ESRI geodatabase (.gdb) write mode in QGIS, OGR2OGR or Python

[Nicolas Cadieux via Qgis-user]

Hi,

I am in a bit of a bind.  I am basically trying to figure out a way to 
write some .shp file to a .gbd folder using the gbd drivers obtained 
from ESRI. I am not sure what file to copy and where.  I am tying to 
make this work with ogr2ogr at the dos command prompt but getting to 
work with a anaconda python environment would be nice.


Can the ESRI File Geodatabase API also be used write to a .gdb file 
using QGIS?


If you recently did this, I would appreciate some tips.

I am on windows 10 using the OSGEO4W install with QGIS 3.24.

https://gdal.org/drivers/vector/filegdb.html

Thanks

--

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https://gitlab.com/njacadieux

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Re: [Qgis-user] Fwd: Creating a polygon around vertices

[Nicolas Cadieux via Qgis-user]

Hi,

Another way is to create a TIN (vector/geometry tools/Delaunay 
triangulation) and then to  dissolve (vector/geoprocessing 
tools/dissolve) the result.  This may  be painful depending on your 
computer. This method would create very tight border.


Nicolas

On 2022-04-12 8:44 a.m., Stefan Giese (WhereGroup) via Qgis-user wrote:


search for concavehull or see this one https://youtu.be/24H_MyXohL4

Am 12.04.2022 um 14:36 schrieb Yamen Tekaji via Qgis-user:



Dears,

I have a layer containing 700K points. please check attachment.
I want to create a polygon that passes through the outer points only. 
an outline polygon.

Can you please help me in achieving this?
If you know a web page that teaches this in details, it will 
be helpful and appreciated.


Thanks
Yamen



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Re: [Qgis-user] Snap existing geometry to other layer

[Nicolas Cadieux via Qgis-user]

Backup backup backup! 

The snap geometries to layer works very well as Alexandre stated.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 8 avr. 2022 à 07:12, Alexandre Neto via Qgis-user 
>  a écrit :
> 
> 
> Hi Uwe,
> 
> The snap geometries to layer tool in processing toolbox can be used in 
> in-place feature editing, which does the changes without creating a new layer.
> 
> https://docs.qgis.org/3.22/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#snap-geometries-to-layer
> 
> https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html?highlight=place#the-processing-in-place-layer-modifier
> 
> Best regards
> 
> Alexandre Neto
> User support
> www.qcooperative.net
> 
> Uwe Fischer via Qgis-user  escreveu no dia sexta, 
> 8/04/2022 à(s) 11:34:
>> Hello,
>> 
>>  
>> 
>> I need to snap individual features to another layer. It’s not new features 
>> but existing ones. And, the process should not create a new shapefile but it 
>> should modify existing features that were selected beforehand for snapping.
>> 
>>  
>> 
>> Google told me that there is a Plugin called „Geometry Snapper“ but I could 
>> not find in for QGIS 3.22 LRT.
>> 
>>  
>> 
>> Any ideas? Thank you so much!
>> 
>>  
>> 
>> Regards, Uwe
>> 
>>  
>> 
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Re: [Qgis-user] Help with scales in print layouts for geographic CRS

[Nicolas Cadieux via Qgis-user]

Hi Nyall,

That would be a "nice to have"!

Nicolas

On 2022-04-06 9:13 p.m., Nyall Dawson via Qgis-user wrote:

On Thu, 7 Apr 2022 at 10:26, Greg Troxel  wrote:


Nyall Dawson  writes:


In all cases (projected OR geographic) the scalebar logic is:

1. Create a horizontal line across the width of the layout map
2. Calculate the length of that line using great circle/ellipsoidal
calculations, based on the project's ellipsoid settings.
3. Compare the length of the ellipsoidal line vs the map width to
calculate the corresponding scale

That is a very straightforward approach with easy-to-understand
semantics.


So qgis scalebar calculations are ALWAYS based on great
circle/ellipsoidal lengths*.

And more precisely, a true geodesic between two points varying in x and
with constant y in the layout CRS.  For north-up (at least ish)
projections, that means a line of constant latitude.

For a lat/lon CRS in the layout, at mid latitudes, it's going to mean
that the scale in the y axis is smaller by about 110km/70km; a square in
lat/lon is taller than it is wide (and plus it's not a square, but
that's less obvious).  Equivalently, a square on the ground has a larger
difference in longitude than it does in latitude.  Or maybe I have that
backward, but using lat/lon in a layout does not preserve shapes.

This is what I was trying to get at: a single concept of scale is really
only valid for a projection that has the same scale in x and y.  Which I
think is true iff the projection is conformal.  And it's only truly
valid if the scale doesn't change over the layout, which is probably
~never exactly true, but many projections aim to have it remain close
enough to be treated as constant (e.g. UTM).

Which is a long way of getting around to "if you are using lat/lon as
the axes in your layout, either you are doing something odd on purpose
or you probably should rethink your approach."  If you really do mean
it, I would find the explanation of why interesting.

All correct, indeed!

I've been thinking about introducing a new warning when exporting
layouts, which would look something like this:

1. For each scale bar, look at the referenced map
2. Measure the scale using multiple lines, each across the
top/middle/bottom horizontally and left/center/right vertically
3. Compare these scale values, and if any differ by more than XXX %
then show a warning to the user. Something like "The scale for map 1
varies from 1: to 1:y across different parts of the map.
Consider using an alternative form of representing the map scale (such
as a grid overlay), as the scale bar may be misleading for this map."

What do you think?

Nyall



* Unless the project itself is set to not use ellipsoidal calculations
and only use planar calculations, in the project properties dialog

Presumably those calculations are in the project CRS's xy space, and
would typically (when used sensibly) be grid distance in UTM, some State
Plane Coordinate System, or similar.

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Re: [Qgis-user] Help with scales in print layouts for geographic CRS

[Nicolas Cadieux via Qgis-user]

Hi,
Your calculations are based on a sphere.  The different crs use a geoids. It 
would help if you could say what crs you are using and the differences between 
what you get and what you expect.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 6 avr. 2022 à 13:13, Jorge Gustavo Rocha via Qgis-user 
>  a écrit :
> 
> Hi,
> 
> Thank you all for the comments.
> 
> As far as I can see from my tests, the behavior is not related with the CRS 
> in use. I've used more than one meter based projection to make sure the areas 
> were fine. I use the advanced digitizing tools to create segments with the 
> exact distance. Using projected CRS, the layouts are always fine.
> 
> The problem is related to the map area calculated for a giving scale, in the 
> composer, when a lat/long coordinate system is in use.
> 
> If I make a very simple calculation of the area to render at a giving scale, 
> my calculations work fine.
> 
> The width does not depend on the latitude, and should be:
> 
> layout_width_mm * scale / 1000.0
> 
> The height depends on the latitude. To compute it, I use the cosine of the 
> latitude:
> 
> cosine = cos( center_latitude * PI / 180 );
> 
> layout_height_mm * scale / 1000.0 / cosine;
> 
> Based on this simple math, after converting these distances to lat/log, I can 
> compute the "correct" ( ie expected) extend of the map in the layout. If I 
> setup this extent manually, it works fine.
> 
> But the extent calculated by QGIS is different. I'll have to check the code 
> to see why the logic if different from this one. Probably I am simplifying 
> the calculations too much.
> 
> I'll return back after reading the code.
> 
> Regards,
> 
> Jorge Gustavo
> 
>> On 06/04/22 15:10, Greg Troxel via Qgis-user wrote:
>> Patrick Dunford via Qgis-user  writes:
>> 
>>> On 6/04/22 11:34, Greg Troxel via Qgis-user wrote:
 Jorge Gustavo Rocha via Qgis-user  writes:
 
 2) Using a geographic CRS, the same 150mm x 150mm map, at the same
> 1:1 scale, the area is bigger then the 1500m polygon. The result
> is attached https://nextcloud.geomaster.pt/index.php/s/H2eAytsPANyxn6Y
> 
> On both layouts the scale bar widget is working properly. The
> distances (and areas) are properly calculated in QGIS interface. I
> have set the GRS 1980 ellipsoid for distance and area calculations.
 What does it mean to use a geographic CRS for a print layout?  Do you
 really expect longitude on the x axis and latitude on the y axis?  The
 value of meters/degree is different for x and y, unless you are at or
 near the equator.  (Living at 42N-ish, I'm very aware of this.)
>>> This may be the case for projections like EPSG:3857 that are based on
>>> a spherical projection of the Earth but is it the case for all
>>> projections?
>> By "geographic CRS", I interpet that to mean one that is latitude and
>> longitude.  That is not really a "projection".
>> 
>> Yes, EPSG:3857 has an incorrect spherical assumption, and I'd have to
>> calculate, but I would not expect massive scale distortion, where
>> massive is casually visually apparent.
>> 
>> Perhaps Jorge can be precise about which CRS codes are in use.
>> 
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Re: [Qgis-user] Help with scales in print layouts for geographic CRS

[Nicolas Cadieux via Qgis-user]

Hi,

Great question!  I am not the best person to answer it as this is a question 
for the Proj4 project  people. They do geodesy and generally, a conversation 
with them bring me back to my worse math class experiences! I should have 
listened, I say to myself!

Anyways, CRS are not all created the same.  If you read the link below, you 
will see that a CRS can minimize distorsion for the area, distance, shape, 
direction and bearing but not all of them at once.  Google for the projected 
coordinates system you used.  You may find what quality it aims to minimize 
distortion.  If not, Google for the type of projection it’s based on 
(conformal, equal-area…)
https://en.wikipedia.org/wiki/Map_projection

As others have pointed, a degree of longitude does not measure the same length 
as a degree of latitude.  I would expect scales to reflect latitude distances 
for the latitude of your map.  If this is not the case, then they are possibly 
using a short cut and using a latitude distance at the equator.  This would be 
a good question for the developers.

Whatever test you do, make sure your polygon in the projected CRS does measure 
the correct 1000x1000m or 1500x1500m in length.  The easiest way to do this is 
to draw the rectangle using advanced digitizing modes is a local UTM zone.  You 
can also use a WKT polygon you created in a csv file.

 (https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry) 

Then,  « densify » (processing tools box) the rectangle to add tons of nodes to 
the lines.  ( A rectangle with only 4 corner nodes cannot be accurately 
reprojected on a sphere.) Then, reproject the layer to a projected CRS you want 
to test.  Make sure all the layers are in the same crs as the project, same 
thing for the map space.  You need to make sure QGIS does not do any 
reprojection on the fly without you knowing it.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 5 avr. 2022 à 11:00, Jorge Gustavo Rocha via Qgis-user 
>  a écrit :
> 
> Hi,
> 
> I need you help to understand how scale works with geographic coordinate 
> systems.
> 
> For projected coordinates systems, the layouts seems to work as expected.
> 
> This is my use case:
> 
> I've draw a polygon with 1000m width and height, and another with 1500, width 
> and height, sharing the upper left corner.
> 
> 1) Using a projected CRS, if I create a layout with a 150mm x 150mm map, the 
> 1500m polygon fits perfectly on the print area, setting a 1:1 scale. 
> That's what I expected. The results is 
> https://nextcloud.geomaster.pt/index.php/s/TKpkBaqty8BdLL8
> 
> 2) Using a geographic CRS, the same 150mm x 150mm map, at the same 1:1 
> scale, the area is bigger then the 1500m polygon. The result is attached 
> https://nextcloud.geomaster.pt/index.php/s/H2eAytsPANyxn6Y
> 
> On both layouts the scale bar widget is working properly. The distances (and 
> areas) are properly calculated in QGIS interface. I have set the GRS 1980 
> ellipsoid for distance and area calculations.
> 
> My question is: why the second layout does not fit the 1500m polygon 
> properly? The second layout shows approximately a 2000m square, instead of a 
> 1500m square.
> 
> Regards,
> 
> Jorge Gustavo
> 
> 
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Re: [Qgis-user] Problem trying to graduate by value (colum)

[Nicolas Cadieux via Qgis-user]

Hi,

Your number fields are probably using a text format.  You cannot graduate a 
text field.  

Create a new field (columns) with a float or int and, using the field 
calculator to copy the data from the text field this new field.  You can also 
just change the field type but if you do that, backup the data first as some 
data may be lost.  Make sure the data is good before continuing as having a 
mixe of number format (like using commas and points) is all good for a text 
field but will not be appreciated by the number field.  They will become NULL 
data.  

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 5 avr. 2022 à 07:25, Claudio Briones Barrera via Qgis-user 
>  a écrit :
> 
> 
> Hello, my name is Claudio. 
> 
> Versión de QGIS
> 3.16.1-Hannover
> 
> Problem: When I open Layer Properties of a Layer, and I try to edit Symbol by 
> value (colum), I cant select any colum. If I try to do it in the categorized 
> way, I do can select the colum without problem. Why? 
> 
> Thank you for your attention, 
> 
> Regards
> -- 
> Claudio Briones Barrera
> Profesor del Área de Mecánica de Medios Continuos y Teoría de las Estructuras
> 
> 
> 
> Departamento de Técnicas y Proyectos en Ingeniería y Arquitectura
> 
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> Apartado 456
> 38200 La Laguna. S/C de Tenerife
> 
> Teléfono: 922 31 98 93
> Email: cbrio...@ull.edu.es
> 
> ull.es
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Re: [Qgis-user] Questões sobre o QGIS 3.22.5

[Nicolas Cadieux via Qgis-user]

Yes,

Profile from point is a plugin right?  Updating that plugin would help.  You 
could delete it or create a new profile.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 2 avr. 2022 à 10:06, Bernd Vogelgesang via Qgis-user 
>  a écrit :
> 
> 
> 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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>> 
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