Re: [Qgis-user] OGR error setting feature 35

[Thayer Young via QGIS-User]

 Hi Neil,
I think that means that you neglected to fill in a value for a required field, 
the 35th feature is the one causing the problem. If you open the attribute 
table and sort the column that you normally put values into you should be able 
to find features without values. 

-Thayer
 

On Wednesday, October 4, 2023 at 06:06:15 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
From: Neil Watson 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] OGR error setting feature 35
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Hi,

I am hand-contouring a map using the Add Line Feature function and
occasionally have this error reported and that the changes cannot not be
committed.  I couldn't find informaiton on this error in the Help pages.
Are there any settings to prevent the creation of non-finite coordinates?


THanks in advance.

 [image: image.png]

Sincerely,



Neil Watson, P. Geol.
Director, Geology



(m) 403-669-4457

http://www.enlightengeoscience.com/
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Re: [Qgis-user] spatial analysis toolbox - testing for autocorrelation

[Thayer Young via QGIS-User]

 Great news. Best wishes for your analysis!
-Thayer


On Tuesday, August 29, 2023 at 09:45:39 AM EDT, Francesca Parente 
 wrote:  
 
 Hello Thayer,
thank you so much again for your patience and the specific inputs you provided, 
I finally made it and the plugin works now!(I had to put the process in stand 
by for a few days as it was driving me crazy: at a certain point it looked like 
geopandas was imported, but the plugin gave me error anyway -_-)
Many thanks to everyone else in this list for the precious support you offer, 
spending so much time and effort in sharing your advices.Have a very good day!
Best,Francesca
Il giorno ven 18 ago 2023 alle ore 22:29 Thayer Young via QGIS-User 
 ha scritto:

 Hi Francesca,
This is the same error as you had before, just for a different python module, 
mgwr this time. The "Spatial Analysis Toolbox" page in the Plugin Manager lists 
the following dependencies: pandas, geopandas, libpysal, esda, mgwr.

Thank you for your patience. You can ignore my previous answers. I have tested 
the following procedure on a fresh install of Windows 11:
1) Inside the folder for QGIS 3.28.9 Firenze that you just installed.
2) Right click on the 'OSGeo4W Shell' alias.3) Select 'Run as administrator'    
a) This will bring up a black window with the label 'Administrator: OSGeo4W 
Shell'    b) At the top of the black part it should say something like: 
    run o-help for a list of available commands
    C:\Program Files\QGIS 3.32.1>      c) to the right of the > 
there should be a blinking underscore character '_' 
4) Then type:    python    and press enter.5) Several lines of text should 
appear below this, like: Python 3.9.5 (tags/v3.9.5:0a7dcbd, May  3 
2021, 17:27:52) [MSC v.1928 64 bit (AMD64)] on win32 Type "help", 
"copyright", "credits" or "license" for more information. >>>     
6) At the blinking cursor type (do not type the >>>): >>> import pandas 
    
   a) press enter7) Nothing should happen except that in a few seconds the 
cursor will move to a new line >>>        a) This means that pandas is 
already installed 8) At the blinking cursor type (do not type the >>>): 
>>> import geopandas        a) This should bring up a long error in red text.   
b) this means that geopandas is not installed. (It is installed in Lima not 
Firenze.)
10) Do the same with the rest of the three modules to see if they are 
installed:     import libpysal      import esda     
 import mgwr     
    a) in my experience they are not (they are installed.
11) Then exit python by typing:  exit()     12) This brings you 
back to:    C:\Program Files\QGIS 3.32.1>     
13) Where for each one of the modules that are not installed you want to type:  
  pip install geopandas --user    
    pip install libpysal --user        pip install esda --user  
  
    pip install mgwr --user    
  a) it should take a few seconds for some of these, but when they are done, 
after each one of there should be a lot of white text followed by something 
like:    Successfully installed platformdirs-3.10.0 
python-dateutil-2.8.2 soupsieve-2.4.1    [notice] A new release of pip 
is available: 23.1.2 -> 23.2.1    [notice] To update, run: python3.exe 
-m pip install --upgrade pip    C:\Program Files\QGIS 3.32.1>   
   b) there should not be lines of red text errors.
14) Restart QGIS 3.28.9 Firenze
15) Go to Manage and Install Plugins and click on 'Installed Plugins' and turn 
on the check mark next to 'Spatial Analysis Toolbox'.   a) It should take a few 
seconds with the rotating circle and the check mark will be checked.   b) If 
not you will get a similar error as when you installed the plugin.

This video shows these steps, but I have made them specific to your needs:
https://www.youtube.com/watch?v=Bm3qyh1fO-M
-Thayer


On Friday, August 18, 2023 at 04:05:57 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  > 
Date: Fri, 18 Aug 2023 10:04:40 +0200
> From: Francesca Parente 
> To: Thayer Young 
> Cc: "qgis-user@lists.osgeo.org" 
> Subject: Re: [Qgis-user] spatial analysis toolbox - testing for
    autocorrelation
> Message-ID:
    
> Content-Type: text/plain; charset="utf-8"

> Thanks again Thayer,
> I  tried the first option and updated to 3.28.9 Firenze, but when I run it I
> get the following multiple errors (I don't know if they're the same kind
> you were getting with OSGeo4W installer):
*2023-08-18T09:43:26    CRITICAL    Traceback (most recent call last):
          File
"C:\PROGRA~1/QGIS32~1.9/apps/qgis-ltr/./python\qgis\utils.py", line 423, in
_startPlugin              plugins[packageName] =
package.classFactory(iface)              File
"

Re: [Qgis-user] Building footprint extraction from satellite image

[Thayer Young via QGIS-User]

 Hi Michael,
Not sure what the current state of the art is in opensource AI for building 
recognition from aerial imagery is, but I think you can at least get started 
with Orfeo Toolbox, and or TensorFlow. Orfeo can be used in QGIS but you have 
to download and install it separately.As you are a JOSM user, you may already 
be in the know, but just in case I will remind you:If you do go this route and 
intend to bulk upload to OSM please read the OSM Wiki pages for automated edits.
https://wiki.openstreetmap.org/wiki/Automated_editsand 
imports:https://wiki.openstreetmap.org/wiki/Import/Guidelines
-Thayer

On Saturday, August 26, 2023 at 03:00:13 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
> Hi, I'm looking for a way to extract building footprints from satellite
> images.
>
> I already make scenery from the satellite images for my flight simulator
> using free software called AeroScenery.
>
> I can also make buildings, trees, night lights from OSM data using free
> software called ScenProc. However there are many areas that do not have
> sufficient OSM data in some cases missing hundreds of buildings. In the
> past I have spent many weeks hand editing using JOSM to replace missing
> buildings.
>
> Is there a way using QGIS with plugins to automate this process please?
>
> Kindest regards, Michael.
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Re: [Qgis-user] Missing Processing Point Cloud macOS QGIS 3.32.1:

[Thayer Young via QGIS-User]

 Thank you both for this question and answer! This is tremendous! QGIS for ARM 
Macs, and with point cloud tools!
-Thayer

> On Monday, August 21, 2023 at 03:00:31 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:
> From: Saber Razmjooei 
> To: dworm...@post.harvard.edu
> Cc: QGIS-User@lists.osgeo.org, David Wormuth 
> Subject: Re: [Qgis-user] Missing Processing Point Cloud macOS QGIS
> 3.32.1
> Message-ID:
> 
> Content-Type: text/plain; charset="utf-8"
> 
> Hi David,
> 
> It looks like if you install QGIS through Conda, you will have point cloud
> processing.
> 
> Kind regards
> Saber
> 
> On Mon, 21 Aug 2023 at 13:40, David Wormuth via QGIS-User <
> qgis-user@lists.osgeo.org> wrote:
> 
> > I don't see the Point Cloud options in the Processing Toolbox in QGIS
> > 3.32.1 on macOS Monterey. I see them in the Windows version of the 3.32.1.
> >
> > Is there another step I need to take to enable the Point Clouds in macOS?
> >
> > Dave
> > ___
> > 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
> >
> -- 
> Saber Razmjooei
> www.lutraconsulting.co.uk
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Re: [Qgis-user] spatial analysis toolbox - testing for autocorrelation

[Thayer Young via QGIS-User]

 Hi Andrea,
I tested this from a fresh Windows. I found that geopandas was not installed on 
Firenze.I don't have any more licenses and I don't know where to look in the 
source code.
How about PDAL?

-Thayer


On Saturday, August 19, 2023 at 08:00:01 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
--
Date: Sat, 19 Aug 2023 11:49:45 +0200
From: Andrea Giudiceandrea 
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] spatial analysis toolbox - testing for
    autocorrelation
Message-ID: <77af0f5e-52bd-4666-8f9d-5058c3e51...@libero.it>
Content-Type: text/plain; charset=UTF-8; format=flowed

> Thayer Young via QGIS-User Fri, 18 Aug 2023 13:28:49 -0700

>  this means that geopandas is not installed. (It is installed in Lima not 
> Firenze.)

Hi Thayer,
it seems to me the Python module "geopandas" is installed by default by 
both the current QGIS all-in-one stand-alone OSGeo4W .msi installer and 
the "network" OSGeo4W .exe installer (for qgis-full and qgis-ltr-full 
packages) for both QGIS 3.28 and QGIS 3.32.

Anyway, another simple way to install the required Python packages, 
avoiding to use the shell and type commands in the CLI, is to use the 
OSGeo4W "Setup" program: all the required packages could be installed 
with few clicks.

Best regards.

Andrea


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Re: [Qgis-user] spatial analysis toolbox - testing for autocorrelation

[Thayer Young via QGIS-User]

qgis-ltr/./python\qgis\utils.py", line 888, in
_import              mod = _builtin_import(name, globals, locals, fromlist,
level)              File
"C:\Users/fparente/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\spatialanalysistoolbox\spatialanalysistoolbox_provider.py",
line 35, in              from .algorithms.GWR_ import GWR_
File "C:\PROGRA~1/QGIS32~1.9/apps/qgis-ltr/./python\qgis\utils.py", line
888, in _import              mod = _builtin_import(name, globals, locals,
fromlist, level)              File
"C:\Users/fparente/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\spatialanalysistoolbox\algorithms\GWR_.py",
line 26, in              from mgwr.gwr import GWR              File
"C:\PROGRA~1/QGIS32~1.9/apps/qgis-ltr/./python\qgis\utils.py", line 888, in
_import              mod = _builtin_import(name, globals, locals, fromlist,
level)            ModuleNotFoundError: No module named 'mgwr'*

Also only now I get the sense that "python prompt" refers to an app called
Command Prompt, right? Apologies for any obvious question asked!

Maybe I'll try with the second option.
Thanks again, you and all others who gave their inputs!
Have a good day and a good weekend everyone,
Francesca


Il giorno lun 14 ago 2023 alle ore 16:40 Thayer Young 
ha scritto:

> Hi Francesca,
>
> Sorry for the confusion.
>
> FYI, I recently installed the 3.28 .msi QGIS from the QGIS.org website and
> geopandas is installed. You may just want to update your QGIS. I did not
> use the OSGeo4W installer, as that was giving me missing .dll errors.
>
> If you want to persist with your current install, I think you want to do
> the following:
>
> Open the 'Command Prompt' program (go to the start menu and search for it)
> When it opens you will this prompt:    C:\Users\your_user_name>  From
> file explorer drag and drop the 'python.exe' onto the Command Prompt
> window. It should list the path to the python.exe file. You then want to
> press enter. That should log you in to an interactive python terminal and
> change the prompt to '>>>'.    Type in:  import geopandas    and press
> enter. That should give you a 'ModuleNotFoundError'.
>
> If it does not give you an error and instead just goes to the next line,
> you know that geopandas is installed. You can enter: exit()  and press
> enter, and you can close the Command Prompt window.
>
> If you get the 'ModuleNotFoundError' error, press the up arrow and it
> should bring up the path to the python.exe file again.
> Then enter:  -m pip install geopandas  Then press enter.
> That should bring up a long list of installation stuff, hopefully none of
> it is red. You can then press the up arrow twice to get the path to the
> python.exe and press enter to start python. Then try importing geopandas
> again as above.
>
>
> https://gis.stackexchange.com/questions/346859/importing-geopandas-in-qgis-3
>
> -Thayer
>
>
>
> On Monday, August 14, 2023 at 05:58:31 AM EDT, Francesca Parente <
> francescaparente@gmail.com> wrote:
>
>
> Thank you both! I checked that out and tried the suggested installing
> procedure.. but I can't get the command prompt where to type "pip install
> geopandas".
> I think I'm still missing a piece, I'm not so familiar with the python
> environment as you can assume.
>
> These are the steps I followed:
>
> [image: image.png]
> --->
> [image: image.png]
> Then I clicked on "python3.dll", which downloaded the file I tried to open
> - but got me just another error message in QGis (saying that is an invalid
> data source).
> I searched online for other tips and tutorials, but (besides another
> procedure using fiona) I haven't found anything more specific on this one.
>
> Should I go into the "Scripts" folder and click on "pip.exe" or "pip3.exe"?
> Thanks again for your time and any other inputs you may have!
> Francesca
>
>
> Il giorno ven 11 ago 2023 alle ore 19:20 Thayer Young via QGIS-User <
> qgis-user@lists.osgeo.org> ha scritto:
>
> Hi Francesca,
>
> If you don't know how to install Geopandas, I would like to add to what
> Paolo said. Geopandas needs to be installed in the python that QGIS is
> using.
> You can check the location of the python installation by going to the
> overall preferences for QGIS (command comma on a Mac, probably control
> comma on other systems.)
> From the System tab scroll to the bottom to find the "Current environment
> variables" scroll down to find PYTHONHOME.
> This documentation page shows you more with pictures:
>
> https://docs.qgis.org/3.28/en/docs/user_manual/introduction/qgis_configuration.html#system-settings
>
> Then in Finder or Expl

[Qgis-user] Why aren't native code updates included in MacPackager? PDAL too old?

[Thayer Young via QGIS-User]

Does the older PDAL, 2.3.0 in the MacOS binaries explain why the new point 
cloud processing algorithms are not available in Lima 3.32.1? The Windows .msi 
installer for 3.32.1 (PDAL 2.5.5) does have the algorithms and they work. Is it 
correct to say the new point cloud algorithms are a wrapper for PDAL? 
I want to make sure I have it right before I make a feature request to update 
PDAL.
Or can someone rename this issue to handle 
it?https://github.com/qgis/QGIS-Mac-Packager/issues/149 -Thayer


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Re: [Qgis-user] spatial analysis toolbox - testing for autocorrelation

[Thayer Young via QGIS-User]

 Hi Francesca,
Sorry for the confusion.

FYI, I recently installed the 3.28 .msi QGIS from the QGIS.org website and 
geopandas is installed. You may just want to update your QGIS. I did not use 
the OSGeo4W installer, as that was giving me missing .dll errors.
If you want to persist with your current install, I think you want to do the 
following:
Open the 'Command Prompt' program (go to the start menu and search for it)
When it opens you will this prompt: C:\Users\your_user_name>   From file 
explorer drag and drop the 'python.exe' onto the Command Prompt window. It 
should list the path to the python.exe file. You then want to press enter. That 
should log you in to an interactive python terminal and change the prompt to 
'>>>'.    Type in:   import geopandas    and press enter. That should give you 
a 'ModuleNotFoundError'. 
If it does not give you an error and instead just goes to the next line, you 
know that geopandas is installed. You can enter: exit()  and press enter, and 
you can close the Command Prompt window.

If you get the 'ModuleNotFoundError' error, press the up arrow and it should 
bring up the path to the python.exe file again.
Then enter:   -m pip install geopandas  Then press enter.That should bring up a 
long list of installation stuff, hopefully none of it is red. You can then 
press the up arrow twice to get the path to the python.exe and press enter to 
start python. Then try importing geopandas again as above.
https://gis.stackexchange.com/questions/346859/importing-geopandas-in-qgis-3
-Thayer


On Monday, August 14, 2023 at 05:58:31 AM EDT, Francesca Parente 
 wrote:  
 
 Thank you both! I checked that out and tried the suggested installing 
procedure.. but I can't get the command prompt where to type "pip install 
geopandas".I think I'm still missing a piece, I'm not so familiar with the 
python environment as you can assume.
These are the steps I followed:

--->

Then I clicked on "python3.dll", which downloaded the file I tried to open - 
but got me just another error message in QGis (saying that is an invalid data 
source).I searched online for other tips and tutorials, but (besides another 
procedure using fiona) I haven't found anything more specific on this one.
Should I go into the "Scripts" folder and click on "pip.exe" or 
"pip3.exe"?Thanks again for your time and any other inputs you may 
have!Francesca

Il giorno ven 11 ago 2023 alle ore 19:20 Thayer Young via QGIS-User 
 ha scritto:

 Hi Francesca,
If you don't know how to install Geopandas, I would like to add to what Paolo 
said. Geopandas needs to be installed in the python that QGIS is using.You can 
check the location of the python installation by going to the overall 
preferences for QGIS (command comma on a Mac, probably control comma on other 
systems.) 
>From the System tab scroll to the bottom to find the "Current environment 
>variables" scroll down to find PYTHONHOME.This documentation page shows you 
>more with pictures:
https://docs.qgis.org/3.28/en/docs/user_manual/introduction/qgis_configuration.html#system-settings
Then in Finder or Explorer, etc. you want to find  location in the file system. 
On a Mac you will need to right click on QGIS in your applications folder and 
show package contents.  Then continue through the path and double click to open 
the python3 file.This will bring up a python prompt where you want to type:   
pip install geopandas   Then press enter/return. It will run for a while and 
hopefully say that you successfully installed geopandas. You will probably need 
to restart QGIS after that.

-Thayer


On Thursday, August 10, 2023 at 03:00:37 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
--
Date: Thu, 10 Aug 2023 17:29:39 +0300
From: Paolo Cavallini 
To: Francesca Parente , Francesca
    Parente via QGIS-User , QGIS User List
    
Subject: Re: [Qgis-user] spatial analysis toolbox - testing for
    autocorrelation
Message-ID: 
Content-Type: text/plain; charset="utf-8"

You have to install geopandas.
Cheers.

Il 10 agosto 2023 17:10:28 EEST, Francesca Parente via QGIS-User 
 ha scritto:
>Hello everyone!
>
>I was wondering how to perform spatial autocorrelation tests in QGis and I
>downloaded the Spatial Analysis Toolbox
><https://plugins.qgis.org/plugins/spatialanalysistoolbox/> plugin.
>I can't even open it thought and immediately got the following error
>message:

>*Impossibile caricare il plugin 'spatialanalysistoolbox' a causa di un
>errore chiamando il metodo classFactory() ModuleNotFoundError: No module
>named 'geopandas' Traceback (most recent call last):  File
>"C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 335, in _startPlugin
>  plugins[packageName] = package.classFactory(iface)  File
>"C:/Users/fparente/AppDat

Re: [Qgis-user] spatial analysis toolbox - testing for autocorrelation

[Thayer Young via QGIS-User]

 Hi Francesca,
If you don't know how to install Geopandas, I would like to add to what Paolo 
said. Geopandas needs to be installed in the python that QGIS is using.You can 
check the location of the python installation by going to the overall 
preferences for QGIS (command comma on a Mac, probably control comma on other 
systems.) 
>From the System tab scroll to the bottom to find the "Current environment 
>variables" scroll down to find PYTHONHOME.This documentation page shows you 
>more with pictures:
https://docs.qgis.org/3.28/en/docs/user_manual/introduction/qgis_configuration.html#system-settings
Then in Finder or Explorer, etc. you want to find  location in the file system. 
On a Mac you will need to right click on QGIS in your applications folder and 
show package contents.  Then continue through the path and double click to open 
the python3 file.This will bring up a python prompt where you want to type:   
pip install geopandas   Then press enter/return. It will run for a while and 
hopefully say that you successfully installed geopandas. You will probably need 
to restart QGIS after that.

-Thayer


On Thursday, August 10, 2023 at 03:00:37 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
--
Date: Thu, 10 Aug 2023 17:29:39 +0300
From: Paolo Cavallini 
To: Francesca Parente , Francesca
    Parente via QGIS-User , QGIS User List
    
Subject: Re: [Qgis-user] spatial analysis toolbox - testing for
    autocorrelation
Message-ID: 
Content-Type: text/plain; charset="utf-8"

You have to install geopandas.
Cheers.

Il 10 agosto 2023 17:10:28 EEST, Francesca Parente via QGIS-User 
 ha scritto:
>Hello everyone!
>
>I was wondering how to perform spatial autocorrelation tests in QGis and I
>downloaded the Spatial Analysis Toolbox
> plugin.
>I can't even open it thought and immediately got the following error
>message:

>*Impossibile caricare il plugin 'spatialanalysistoolbox' a causa di un
>errore chiamando il metodo classFactory() ModuleNotFoundError: No module
>named 'geopandas' Traceback (most recent call last):  File
>"C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 335, in _startPlugin
>  plugins[packageName] = package.classFactory(iface)  File
>"C:/Users/fparente/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\spatialanalysistoolbox\__init__.py",
>line 36, in classFactory    from .spatialanalysistoolbox import
>SpatialAnalysisToolboxPlugin  File
>"C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 799, in _import    mod
>= _builtin_import(name, globals, locals, fromlist, level)  File
>"C:/Users/fparente/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\spatialanalysistoolbox\spatialanalysistoolbox.py",
>line 38, in    from .spatialanalysistoolbox_provider import
>SpatialAnalysisToolboxProvider  File
>"C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 799, in _import    mod
>= _builtin_import(name, globals, locals, fromlist, level)  File
>"C:/Users/fparente/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\spatialanalysistoolbox\spatialanalysistoolbox_provider.py",
>line 35, in    from .algorithms.GWR_ import GWR_  File
>"C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 799, in _import    mod
>= _builtin_import(name, globals, locals, fromlist, level)  File
>"C:/Users/fparente/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\spatialanalysistoolbox\algorithms\GWR_.py",
>line 23, in    import geopandas as gpd  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'Versione Python:
>3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit
>(AMD64)] Versione di QGIS: 3.18.2-Z?rich Z?rich, 515138c171 *
>
>I repeated the download/install procedure, but nothing changed.
>Does anybody know how to fix this and/or alternative ways to test for
>spatial autocorrelation here?
>Thanks a lot and have a good day!
>-- 
>
>Francesca Parente
>
>_ SESS Euro PhD  in SocioEconomic
>and Statistical Studies
>_ Linked
>
>in
>
>email: francescaparente@gmail.com
>      fpare...@regione.lazio.it
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End of QGIS-User Digest, Vol 210, Issue 8
*
  

Re: [Qgis-user] doubts about the azimuth value obtained

[Thayer Young via QGIS-User]

 Hi Enrique,
In the OGC standard the start and end points of a simple polygon will be the 
same point. So the azimuth will be 0. For a polygon containing rings it will 
probably be the start point of the outer boundary and the end point of the last 
ring, etc.. None of those is not going to be very helpful. Especially since the 
start and end points of a polygon just tell you where the person chose to start 
digitizing, which is not very meaningful in the real world.
How are you defining the azimuth of a dwelling?
I am assuming that the azimuth of the building polygon is the direction that 
the front door of a building points towards?
  If so, you might want to try finding the azimuth from the centroid of the 
polygon and the end point of the shortest line from the centroid to the street 
centerline segment that it is used for the street address, or just to the 
nearest street centerline. 
  FYI, Building polygons don't usually have street addresses, so you may have 
to get that from a spatial join with the parcel polygon, etc..

Give this some more thought and write back to the list if you still need help. 
Please include what else you have tried and what results you have gotten.
-Thayer

 

On Monday, July 17, 2023 at 03:42:18 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
Date: Mon, 17 Jul 2023 19:15:18 +0200From: Enrique Sagredo Blanco 

To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] doubts about the azimuth value obtained
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Good afternoon:
I am a professor at the University of Mondragon and for the research I am
carrying out I am using QGIS. I want to obtain the azimuth value of the
dwellings in a certain municipality, I have created a variable and using
code I have generated this function which I have attached.

degrees( azimuth(  start_point(  $geometry ), end_point(  $geometry )))

The doubt arises when interpreting this data, since QGIS returns a value
but I don't know how to obtain it. Since it is a unique value, I don't know
how to interpret what it means on a map. Since the polygons analysed have
four sides.

Can you help me?
Thank you very much.

[image: image.png]
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End of QGIS-User Digest, Vol 209, Issue 21
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Re: [Qgis-user] QGIS-User Digest, Vol 208, Issue 31

[Thayer Young via QGIS-User]

 Hi Gert-Jan,
Thank you that works well, with the basic functionality required.
-Thayer

On Tuesday, June 20, 2023 at 03:00:36 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:
From: "Gert-Jan van der Weijden (GISNederland)"
    
To: Thayer Young , QGIS-User Mailinglist
    
Subject: Re: [Qgis-user] Most foolproof method for installing on
    Windows 10?
Message-ID: <334fb634-06d1-0e16-db26-8c0057072...@gisnederland.nl>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Hi Thayer,

Over the past years my experience with the regular .msi (straight from 
https://www.qgis.org/nl/site/forusers/download.html) have been better 
than the OSGEO4W installer, for the same reasons ("DLL hell" ) you mention.
And that was even on "real" windows machines, not on emulated 
Windows-on-a-mac

Especially if you just need plan QGis, and not the side-tools like 
gdal/ogr , grass etc.


Kind regards,

Gert-Jan


On 20-6-2023 15:29, Thayer Young via QGIS-User wrote:
> I am wondering if someone can please recommend the installation for 
> Windows 10 that has the lowest barrier to success? I need to make a 
> recommendation to a client on how to install it on Windows. I had 
> trouble a month or so ago with the OSGEO4W installer recently saying 
> that I don't have the right DLLs in place, despite my efforts to 
> install using the same method I have always used on Windows. I am 
> using OSGEO4W to install QGIS on an emulated Windows on an Intel Mac 
> that has older versions of QGIS installed. None of the QGIS version 
> work anymore for the same reason. Maybe Windows is unhappy with my not 
> updating Windows recently enough? I have seen fairly complicated 
> looking solutions posted to the Github page for other users with 
> similar errors, though not the same DLLs. Thanks in advance for any 
> advice. My apologies for not doing more legwork before writing to the 
> list.
>
> -Thayer
>
> Thayer Young
> Cicada Systems GIS Consulting
> http://www.cicadagis.com
> ___

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[Qgis-user] Most foolproof method for installing on Windows 10?

[Thayer Young via QGIS-User]

I am wondering if someone can please recommend the installation for Windows 10 
that has the lowest barrier to success? I need to make a recommendation to a 
client on how to install it on Windows. I had trouble a month or so ago with 
the OSGEO4W installer recently saying that I don't have the right DLLs in 
place, despite my efforts to install using the same method I have always used 
on Windows. I am using OSGEO4W to install QGIS on an emulated Windows on an 
Intel Mac that has older versions of QGIS installed. None of the QGIS version 
work anymore for the same reason. Maybe Windows is unhappy with my not updating 
Windows recently enough? I have seen fairly complicated looking solutions 
posted to the Github page for other users with similar errors, though not the 
same DLLs. Thanks in advance for any advice. My apologies for not doing more 
legwork before writing to the list.
-Thayer
Thayer YoungCicada Systems GIS Consultinghttp://www.cicadagis.com

 
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Re: [Qgis-user] python code generated during georeferencing in QGIS

[Thayer Young via QGIS-User]

 Hi Spaska,
Have you tried the Debugging/Development Tools panel? to see if you can get 
more of the information you are looking for? You also will probably want to use 
a better IDE than the Python Console, I have heard good things about the 
IPython plugin for QGIS.

If you have specific questions about PyQGIS you can post your code to this list 
with your errors and someone can respond directly to your problem. I hope this 
is helpful.
 -Thayer
PS if you are interested in the source code, a search of 'georef' on the Github 
QGIS repository gives:https://github.com/qgis/QGIS/search?q=georef

On Tuesday, May 16, 2023 at 03:00:30 PM EDT, 
 wrote:  From: Spaska Forteva 

To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] python code generated during georeferencing in
    QGIS
Message-ID:
    
Content-Type: text/plain; charset=UTF-8; format=flowed

Hello,
I have a problem and I hope for an answer here. I know how to 
georeference a tif map with geopoints in QGIS. I have developed a shiny 
app and want to automate/program the georeferencing for several maps 
there (for loop). Unfortunately, I've tried a lot and can't get it 
directly under python without errors. My question, is there any way I 
can see the python code generated during georeferencing in QGIS? I can 
develop something myself in the Python console, but not the steps that I 
create with the QGIS program for georeferencing, right?
Is there a way to see the python code generated during georeferencing in 
QGIS? -GPT says yes, but nothing happens to me in the console :(
Best Regards,
Spaska Forteva
-- 
Dipl.-Inf. Spaska Forteva
Philipps-Universit?t Marburg
Fachbereich Geographie, Umweltinformatik
Deutschhausstr.12
35037 Marburg
Tel. 0049 6421 28-25954
Fax. 0049 6421 28-25670
fort...@staff.uni-marburg.de
--

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Re: [Qgis-user] Asking help for wfs service in tinyows

[Thayer Young via QGIS-User]

 This sounds like a question for the Mapserver list: 
https://www.mapserver.org/community/lists.htmlIf this error is indeed from 
QGIS, please give more detail about what you did.
-Thayer

On Tuesday, April 18, 2023 at 03:00:51 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
From: Boubacar Bah 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Asking help for wfs service in tinyows
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

good evening I hope you're doing well.  I have configured a wfs service on
the tinyows server which I am trying to insert layers from qgis desktop.
When I try to save the new layers I get the following error:
*code=invalidParameterValue
texte= XML request isn't valid.*
If some one Can help me to fix this problem.
Thanks you in advance


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Re: [Qgis-user] To show road reference numbers like Google with background svg syymol.

[Thayer Young via QGIS-User]

 Hi Paul,
In your question you ask about how to display background shields for road 
numbers. I answered this question recently 
here:https://www.mail-archive.com/qgis-user@lists.osgeo.org/msg52139.html 

>From Alexandre Neto's answer to the same question, the documentation page for 
>label backgrounds is 
>here:https://docs.qgis.org/3.28/en/docs/user_manual/style_library/label_settings.html#labels-background
-Thayer


On Thursday, April 13, 2023 at 03:00:37 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
From: Paul N 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] To show road reference numbers like Google with
    background svg syymol.
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Hi,
I want to show road reference numbers as looks in Open street map or Google
map in QGIS. NH23, SH4 etc.

Is it possible with font marker or any other way.
I have two options, 1st to use label with background. 2nd is font marker
which I don't know?

Is there any best way to do this?

Regards

Paul N

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Re: [Qgis-user] Identify features

[Thayer Young via QGIS-User]

 Hi Dario,
In the QGIS 'Preferences' under 'Map Tools' at the top of the window 'Identify' 
you can set the 'Search radius for identifying features and displaying map 
tips'  the default is 2.00 mm.
In the 'Identify Results' panel you can also set the tool to 'Identify Features 
by Radius', which allows you to set the radius every time with two clicks.The 
default setting 'Identify Features by Area or Single Click' also allows you to 
click and drag to select within a rectangle.

-Thayer

On Thursday, April 6, 2023 at 03:00:46 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:
From: Dario C 
To: QGIS User List 
Subject: [Qgis-user] Identify features
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Hi,

Is there any way to decrease or increase "identify features" action area?

Thank you,
Dario


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Re: [Qgis-user] Question Re: Map Exporting (How to keep Map

[Thayer Young via QGIS-User]

 This GIS Stackexchange question and answer should help you:
https://gis.stackexchange.com/questions/312150/why-are-labels-and-looks-different-between-print-layout-and-map-canvas-at-same-s
-Thayer

On Thursday, April 6, 2023 at 11:40:51 AM EDT, Michael Raymond 
 wrote:  
 
 
Thank you, I am experimenting with changing the map canvas now. You’re correct 
as well, I am looking into getting an updated version of QGis also. With an 
updated version of QGis what is the normal function one would otherwise use to 
do this? 
 
  
 
Regards,
 
  
 
Mike
 
  
 
From: Thayer Young 
Sent: 06 April 2023 15:56
To: qgis-user@lists.osgeo.org; Michael Raymond 

Subject: Re: Question Re: Map Exporting (How to keep Map
 
  
 
[CAUTION: EXTERNAL EMAIL]This email originated from outside of the 
organisation. Do not click links or open attachments unless you recognise the 
sender and know the content is safe.
 
Hi Mike,
 
  
 
Firstly I would say that you should seriously think about updating your QGIS, 
as 2.18.28 is very old. The current long term release version is 3.28.5. QGIS 3 
has many improvements over 2, and has been in development for long enough that 
the bugs are mostly worked out. I can not remember your specific issue from 2, 
but I know that labeling has been much improved recently in 3, with very good, 
but not necessarily perfect, correspondence between how labels look in the 
layout and how they look on exported pdf's and images, the difference is mostly 
just that occasionally a label will not shows up on an export when it is 
present in the layout. I have not noticed differences in size or font. The 
correspondence between labels in the map canvas and the layout/print is much 
improved also.
 
  
 
You may want to try adjusting your map canvas scale to match the scale in the 
layout. I have found that there is usually a sweet spot where the map canvas 
labels display almost exactly the same as in the layout.
 
  
 
-Thayer
 
  
 
  
 
On Thursday, April 6, 2023 at 06:14:49 AM EDT,qgis-user-requ...@lists.osgeo.org 
 wrote:
 
From: Michael Raymond 
 
To: "qgis-user@lists.osgeo.org" 
 
Subject: [Qgis-user] Question Re: Map Exporting (How to keep Map
 
    labels the same size when exporting Map as pdf or image via composer
 
    manager)
 
Message-ID:
 
    

 
   
 
Content-Type: text/plain; charset="utf-8"
 
  
 
Good morning,
 
  
 
I?m messaging as, when I export my Map as pdf (or as image) the labels on the 
Map are smaller than what is shown when I preview after ?drawing the map? in 
the composer manager.
 
  
 
At present I can remedy this to an extent by lowering the MAP dpi in composer 
manager, but this obviously comes at the cost of the labels teetering on 
illegibility (which is just another version of the issue I?m trying to remedy 
in the first place). I understand a better remedy might be a case of converting 
the raster layer (which I am only presuming is the underlying map that I?m 
having issues with) ?from pixels to points? (or vice versa).
 
  
 
However, I have QGis version 2.18.28 and there doesn?t appear to be any 
explicit function pertaining to this, and indeed said remedy may in fact be 
something different entirely. Am open to any alternative resolutions if so, 
hope you can help?
 
  
 
Note: Have attached a version of the Map which I?ve managed to sort based on 
lowering the dpi, which as you can see works ok but it would be preferred to 
have it clearer.
 
  
 
Regards,
 
  
 
Mike Raymond ? Place Information Officer
 
Performance, Intelligence and Partnerships
 
North Northamptonshire Council
 
Cedar Drive, Thrapston, Northants NN14 4LZ
 
T: 0300 126 3000 | DD:  07423799714
 
  
 
Twitter:@NNorthantsC
 
Facebook:@NorthNorthants
 
Web:www.northnorthants.gov.uk
 
Any views expressed in this email are those of the individual sender and are 
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personal information 

Re: [Qgis-user] Question Re: Map Exporting (How to keep Map

[Thayer Young via QGIS-User]

 Hi Mike,
Firstly I would say that you should seriously think about updating your QGIS, 
as 2.18.28 is very old. The current long term release version is 3.28.5. QGIS 3 
has many improvements over 2, and has been in development for long enough that 
the bugs are mostly worked out. I can not remember your specific issue from 2, 
but I know that labeling has been much improved recently in 3, with very good, 
but not necessarily perfect, correspondence between how labels look in the 
layout and how they look on exported pdf's and images, the difference is mostly 
just that occasionally a label will not shows up on an export when it is 
present in the layout. I have not noticed differences in size or font. The 
correspondence between labels in the map canvas and the layout/print is much 
improved also.
You may want to try adjusting your map canvas scale to match the scale in the 
layout. I have found that there is usually a sweet spot where the map canvas 
labels display almost exactly the same as in the layout.

-Thayer


On Thursday, April 6, 2023 at 06:14:49 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
From: Michael Raymond 
To: "qgis-user@lists.osgeo.org" 
Subject: [Qgis-user] Question Re: Map Exporting (How to keep Map
    labels the same size when exporting Map as pdf or image via composer
    manager)
Message-ID:
    

    
Content-Type: text/plain; charset="utf-8"

Good morning,

I?m messaging as, when I export my Map as pdf (or as image) the labels on the 
Map are smaller than what is shown when I preview after ?drawing the map? in 
the composer manager.

At present I can remedy this to an extent by lowering the MAP dpi in composer 
manager, but this obviously comes at the cost of the labels teetering on 
illegibility (which is just another version of the issue I?m trying to remedy 
in the first place). I understand a better remedy might be a case of converting 
the raster layer (which I am only presuming is the underlying map that I?m 
having issues with) ?from pixels to points? (or vice versa).

However, I have QGis version 2.18.28 and there doesn?t appear to be any 
explicit function pertaining to this, and indeed said remedy may in fact be 
something different entirely. Am open to any alternative resolutions if so, 
hope you can help?

Note: Have attached a version of the Map which I?ve managed to sort based on 
lowering the dpi, which as you can see works ok but it would be preferred to 
have it clearer.

Regards,

Mike Raymond ? Place Information Officer
Performance, Intelligence and Partnerships
North Northamptonshire Council
Cedar Drive, Thrapston, Northants NN14 4LZ
T: 0300 126 3000 | DD:  07423799714

Twitter:@NNorthantsC
Facebook:@NorthNorthants
Web: www.northnorthants.gov.uk
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Re: [Qgis-user] Map tips not showing

[Thayer Young via QGIS-User]

 Hi Adam,
I should have said to activate it from the "View" menu, by clicking on "Show 
Map Tips" there, I did find that the first time I tried with the icon it did 
not seem to work, but when I clicked on it in the "View" menu it did start 
working, and after that I was able to toggle it on and off with the icon.

Sounds like you are doing what is necessary, and Andrea's suggestions will 
hopefully get you there, especially the last one try it with a new user profile 
with no plugins (Settings/User Profiles/New Profile...). 

In my trouble shooting I was able to reproduce your problem on an older install 
of nightly/DEV (3.29.0, f23bdbdad1 , Qt 5.15.2, Python 3.9.5, GDAL 3.3.2) with 
a fresh user. Unfortunately the build for nightly for MacOS is failing right 
now, but I can confirm that map tips work in the latest LTR and PR (3.30.0). So 
it may have been fixed already? but the fix doesn't work on your build for some 
reason. You may want to report this as a bug, just be prepared for the response 
"it works on my machine", it may be specific to your Linux, or to the QGIS 
build that you are using.

By the way, please forgive my use of ESRI terminology when I called the 
"Layers" panel the "table of contents". Old habits are hard to break.

-Thayer


 On Thursday, March 23, 2023 at 04:36:55 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
From: Adam Nielsen To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Map tips not showing
Message-ID: <20230323124538.3c8e2...@vorticon.teln.shikadi.net>
Content-Type: text/plain; charset=US-ASCII

Hi Thayer,

Many thanks for your reply!

> Make sure you have the layer selected in the table of contents

I can't find anything called "table of contents" but there is a panel
called "Layers" where I can tick/untick them to show/hide layers, and
if I click on a layer to select it (a layer with HTML in the Display
properties) then the layer name is drawn in the layer list with a blue
background to indicate it is selected, however I still don't see any
popups when hovering over that layer's markers on the map.

> and hover over the feature for several seconds (e.g. 2 or 3). When I
> say hover, I mean do not move the pointer.

I have hovered for 10 seconds with my hand off the mouse to be extra
sure and still nothing appears.  In the options, the popup time is the
default of 850 milliseconds.  If I hover over the buttons on the
toolbar then tooltips appear successfully, as they do throughout the
various dialog boxes, so it doesn't appear to be a problem with my
technique.

I am not sure how exact you have to be when hovering over the symbol on
the map, but I have tried hovering over a bunch of symbols that were
clustered together, a few pixels above/below/beside the marker,
enlarging the marker, etc. but nothing is popping up.

> Make sure that there is a check mark by "Show Map Tips" in the "View"
> top menu.

There is no check mark but the icon is drawn "pressed" (like the
toolbar button) when it is activated.  I can select it multiple times
to alternate between "normal" and "pressed", just like the toolbar
button.  Regardless of whether the menu item is drawn in the pressed
state or not, there are no popups.

> You might want to try changing the tool, and click on the map window
> or pan the window and try hovering again.

I tried changing to the zoom tool and clicking a few times, then
hovering - no popup.  I changed back to the pan tool - no popup.  I
tried panning around a bit and hovering again - no popup.

> Also you may want to restart QGIS and start from scratch setting up
> the Display tab of the Layer Properties.

I have restarted QGIS and added new HTML to a different feature, but
there is still no popup.

> I am using the same QGIS version but it is built with an older Qt,
> etc. and it works for me, I just have to change the text or
> background color to make it legible.  style="background-color:Tomato;">[% "LABEL_TEXT" %]

I tried changing the colour like this but still no popup.  I have tried
it with a dark satellite map background and the default grey background
and can't see any hint of a popup.  I have also tried setting the popup
to just plain text without using any fields (so it should always
display even if the fields are all blank) but still no popup.

Any other ideas what could be happening?

Many thanks,
Adam.


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Re: [Qgis-user] Map tips not showing

[Thayer Young via QGIS-User]

 Hi Adam

Make sure you have the layer selected in the table of contents and hover over 
the feature for several seconds (e.g. 2 or 3). When I say hover, I mean do not 
move the pointer. Make sure that there is a check mark by "Show Map Tips" in 
the "View" top menu. 
You might want to try changing the tool, and click on the map window or pan the 
window and try hovering again. Also you may want to restart QGIS and start from 
scratch setting up the Display tab of the Layer Properties.
I am using the same QGIS version but it is built with an older Qt, etc. and it 
works for me, I just have to change the text or background color to make it 
legible.
[% "LABEL_TEXT" %]

-Thayer


On Wednesday, March 22, 2023 at 03:00:34 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
From: Adam Nielsen 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Map tips not showing
Message-ID: <20230323035320.494aa...@vorticon.teln.shikadi.net>
Content-Type: text/plain; charset=US-ASCII

Hi all,

I'm new to QGIS and I followed some instructions for importing
geotagged images and displaying them on the map.

Everything seems to work fine, except I don't see any popups when
hovering over the points.

I have enabled the "Show map tips" option but it makes no difference.

I think with this option enabled, I should get popups for other items
too (not just the geotagged image points) however I have never seen a
single map popup in the whole time I've been using QGIS.  If I add HTML
to other features I don't get any popups either.

I checked the manual[1] but can't seem to see anything I have missed.
I originally got a few errors at startup about missing packages, but I
installed those and I no longer get any errors at startup, but the map
tips still won't appear.

I'm running 3.30.0 with Qt 5.15.8, Python 3.10.10, and GDAL 3.6.3 under
Arch Linux.

Are there additional steps required beyond "Show map tips" in order to
get map tips showing?

Many thanks,
Adam.

[1]: 
https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#display-properties


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Re: [Qgis-user] Adding road symbols to a map

[Thayer Young via QGIS-User]

 Hi Mike, 

Download an SVG (scalable vector graphic file) of each shield from Wikipedia 
and then set in the Labels tab of the Layer Styling panel set the text to your 
road's name as you like, then in the Background subtab (looks like a US 
interstate shield) check "Draw background", set shape to SVG and click on the 
ellipsis (...) and navigate to your shield's SVG file. Then you need to adjust 
the offset, shield size and the text size and color, etc.. It takes a while but 
when you figure it out be sure to save the style to an SLD or QML file so you 
can reuse it. If you are using PostGIS or other database you can save the style 
in the database as a default for your highway lines.

-Thayer 

On Wednesday, March 22, 2023 at 03:00:34 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
From: ERT - Mike Breiding 
To: Qgis 
Subject: [Qgis-user] Adding road symbols to a map
Message-ID: <2d184e77-fccd-f4d5-8218-fee237399...@gmail.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Greetings,
I have been reading tutorials and watching YouTube videos but I cannot 
find out how to add road symbols to lines such as interstate and US 
Highway shields.

Any suggestions?
Thanks,
WV-Mike

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Re: [Qgis-user] Layout questions

[Thayer Young via QGIS-User]

 Hi Mike,
1:20 will fit a city, or a small county, but not all of WV. I think your 
map is much larger than the page you are fitting it to.I recommend:1) delete 
the map. 
   You will probably see a lot of grey with a small white box. The white box is 
what gets printed. Note that by default the layout is A4 size. You probably 
want Letter or Legal. 
2) Right click inside the white box (if you don't see the white box do 3 first) 
  a) select Page Properties   b) set the "Page Size" "Size". Legal and Letter 
are in the middle of the list.
3) left click the "zoom full" icon, 4th from the left, 2nd toolbar from the 
top.Then add a new map, this time fit it within the white area of the page. 

Then try exporting your image again.

-Thayer


On Tuesday, March 21, 2023 at 04:00:21 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
Date: Mon, 20 Mar 2023 15:01:34 -0700
From: ERT - Mike Breiding 
To: Qgis 
Subject: [Qgis-user] Layout questions
Message-ID: <4680b603-c5ae-1701-0c3d-83b5dcc68...@gmail.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Greetings,
I have read over the documentation for the Layout.
I have added a map to the layout.
The view of the map is dim or obscured as it was behind a semi 
transparent skin.
When I export the layout as an image only a portion of the map is saved.
I looked for an option such as "Fit map to layout size" but I could not 
find anything.
There are screen shots here:
https://photos.app.goo.gl/PuLieK9hYETMQFyy5

If the map size is changed how does one refresh the layout to reload the 
map?
Thanks,
WV-Mike

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Re: [Qgis-user] Cannot find Print Layout

[Thayer Young via QGIS-User]

 Hi Mike,
Try the Project menu, "New Print Layout" should be 4th from the bottom. You can 
also use the control-p or command-p keyboard combination.
-Thayer

On Monday, March 20, 2023 at 03:00:41 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
Date: Mon, 20 Mar 2023 11:45:25 -0700
From: ERT - Mike Breiding 
To: Qgis 
Subject: [Qgis-user] Cannot find Print Layout
Message-ID: <03b98652-fb0c-a18d-4227-e24c6470d...@gmail.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Greetings,
I cannot see how to create a Print Layout.
I found the info below but I do not see a "New Print Layout icon" or a 
"File" menu.

Obviously I am missing something.
WV-Mike

Ver. 3.28.4
Win 11

Before you start to work with the print layout, you need to load some 
raster or vector layers in the QGIS map canvas
and adapt their properties to suit your own convenience. After 
everything is rendered and symbolized to your liking,

click the New Print Layout icon in the toolbar or choose File ? New 
Print Layout. You will be prompted to choose a
title for the new layout.

QGIS-3.28-DesktopUserGuide-en.pdf 

Page 647
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Re: [Qgis-user] GPKG Multi-Layer to one flat

[Thayer Young via QGIS-User]

 Hi Dennis,
Chris gave some good suggestions. If you are only concerned with the geometry, 
you can try these suggestions. First, make sure that you have a spatial index 
on the layer. Second I think you want to dissolve the polygons, not union them. 
You can also try using the Subdivide processing algorithm first, which will 
make your spatial index more efficient. Then do a dissolve, and if you want 
distinct polygons use the Multipart to Singleparts algorithm.
-Thayer



On Friday, March 3, 2023 at 03:00:50 PM EST, 
qgis-user-requ...@lists.osgeo.org  wrote:
Date: Fri, 3 Mar 2023 19:22:54 +
From: Dennis Burgess 
To: "qgis-user@lists.osgeo.org" 
Subject: [Qgis-user] GPKG Multi-Layer to one flat
Message-ID: 
Content-Type: text/plain; charset="us-ascii"

Ok, has to be a simple solution.

I have a GPKG file that is around 50 meg.  This has multiple layers or at least 
I can see multiple layers.  I.e. I have one polygon on top of another

What I want is to flatten these, to where ONLY the exact area that is show is 
displayed in the smallest file possible.

Union is the way to do this but its SLOW SLOW..  any other options... ?

*
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Re: [Qgis-user] Technical advice

[Thayer Young via QGIS-User]

 Hi Assil,
To save yourself from having to click away all of the error popups, you should 
always click the "Test Connection" button below the authentication section when 
you are creating a new connection.

If Hannes' answer does not solve your problem, it would be helpful if you send 
the full error that you are seeing. There are several possible errors that 
PostgreSQL could be returning, and the approach will vary depending on the 
error. You might also want to describe what method you used to connect to 
PostgreSQL and to create the database (psql, PGAdmin, DBeaver etc.). Your 
PostgreSQL may have stopped running and you may need to restart it, etc. that 
is why you want to check that you can still connect. 

You also may want to check the documentation page to make sure you are filling 
in all the necessary information, note that 3.10 is an out of date version of 
QGIS but the documentation on this point has not changed, also you might want 
to upgrade to a newer QGIS for bug fixes, etc..

https://docs.qgis.org/3.28/en/docs/user_manual/managing_data_source/opening_data.html?highlight=browser%20postgresql#database-related-tools
-Thayer

On Tuesday, February 7, 2023 at 03:00:47 PM EST, 
qgis-user-requ...@lists.osgeo.org 
--
Date: Tue, 7 Feb 2023 02:40:14 +0100
From: Assil Hafdi 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Technical advice
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Good evening
I have encountered an issue with qgis 3.10 where i can't make postgis
connections despite having postgresql installed and creating my data base
after i name the connection and set authentication i keep getting the ente
credentials pop-up even tho i enter the right credentials it keeps
popping up agter 5 or 6 times it just says connection failed would love to
get some help since I've scoured the internet for help but didn't find
anything
I would appreciate the help since im using qgis for school project
Thank you in advance
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Re: [Qgis-user] Mac problem

[Thayer Young via QGIS-User]

 Hi Andrea,
I have not upgraded to 13 yet, but on 12.6 my experience is the same as John 
Layt's, with no requirement for holding down Option. 

I would add however, that I always have to launch QGIS twice after a fresh 
install. The first can be a double click, right click or command-O from finder 
or a Dock alias that gets me to the "malicious software" prompt. The second 
attempt to launch is where you need to do the right or control click the 
QGIS.app (or QGIS-LTR.app, or QGIS-DEV.app) as he describes.
-Thayer

On Friday, January 27, 2023 at 03:01:00 PM EST, 
qgis-user-requ...@lists.osgeo.org  wrote: 
Date: Fri, 27 Jan 2023 18:17:02 +0100
From: Andrea Giudiceandrea 
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Mac problem
Message-ID: 
Content-Type: text/plain; charset="utf-8"; Format="flowed"

> *John Layt*
> /Thu Jan 26 07:12:39 PST 2023/
> 
> you need to manually
> approve the app by first right-clicking on the app and selecting Open from
> the context menu. The Option key is not required.

So the instructions ("right-click on the QGIS app icon, hold down the 
Option key, then choose Open") on the QGIS website [1] are wrong? See a 
comment by a macOS 13.0 user complaining that "If you hold the option 
key you cannot choose Open" [2].

Moreover, the instructions by Apple at [3] say: "in Finder locate the 
app then Control-click the app icon -> Open -> Open". It seems this 
worked for a macOS 13.0 user [4].

Maybe the instructions are macOS version specific?

Could a macOS expert propose an improvement to the instructions on the 
QGIS website?

Best regards.

Andrea Giudiceandrea

[1] https://qgis.org/en/site/forusers/download.html
[2] https://github.com/qgis/QGIS/issues/51616#issuecomment-1406762797
[3] https://support.apple.com/en-gb/guide/mac-help/mchleab3a043/mac
[4] https://github.com/qgis/QGIS/issues/51616#issuecomment-1406795420
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--

End of QGIS-User Digest, Vol 203, Issue 36
**
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Re: [Qgis-user] QGIS - Cluster Points alongside lines by a limit

[Thayer Young via Qgis-user]

Hi Fabian,
Assuming 2 things, first that you lines have a unique ID field, and second that 
you are not concerned with network connectivity:   You can use the "Join 
Attributes by Nearest" tool. Set your points to input layer1 and your lines to 
layer 2. For the "Layer 2 fields to copy" choose the unique ID for the lines. 
Set the "Maximum nearest neighbors" to 10. 
You would then categorize the symbology by the line unique id.
-Thayer


Date: Tue, 29 Nov 2022 13:29:10 +
From: Fabian Laumer 
To: "qgis-user@lists.osgeo.org" 
Subject: [Qgis-user] QGIS - Cluster Points alongside lines by a limit
Message-ID: <6de8cbd3b97447f9b9cd6364e4e84...@hpe-planung.de>
Content-Type: text/plain; charset="us-ascii"

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
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Re: [Qgis-user] PostGIS raster layer filtered by attribute

[Thayer Young via Qgis-user]

 Thanks again Dirk for pointing out this bug. I submitted the report and copied 
Alessandro. Happy mapping!
https://github.com/qgis/QGIS/issues/50841
-Thayer


On Wednesday, November 9, 2022 at 12:42:30 AM EST, 
dirk.pisp...@stadt-koeln.de  wrote:  
 
 
Hi Thayer,
 
  
 
sorry, I’m very busy at the moment.
 
It would be very kind, if you open the issue.
 
Thanks.
 
  
 
Dirk
 
  
 
Von: Thayer Young [mailto:thaye...@yahoo.com]
Gesendet: Dienstag, 8. November 2022 20:37
An: Pispers, Dirk ; Alessandro Pasotti 

Cc: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] PostGIS raster layer filtered by attribute
 
  
 
Hi Dirk,
 
  
 
I have not seen a bug report for this yet. Would you like me to issue one?
 
  
 
I was able to reproduce that the provider for views of raster tables did work 
in 3.10 but stopped working by 3.14.
 
  
 
-Thayer
 
  
 
  
 
  
 
On Friday, November 4, 2022 at 08:06:48 AM EDT, Alessandro Pasotti 
 wrote:
 
  
 
  
 
On Fri, Nov 4, 2022 at 12:18 PM  wrote:
>
> Thanks to Thayer and Alesandro.
> I made a lot of tests today. Not all is working, but it's on a good way.
>
> I did not see the "Filter" option on the raster layer in QGIS 3.22 because I 
> searched in the layer properties analog to where the filter is placed for 
> vector layers.
> The filter option works in general but throws a lot of critical errors, when 
> no raster is in  the result of the filter query.
>
> Another solution I tried is to use a view where the raster table is filtered.
> This works in QGIS 3.10 but not in 3.22, where QGIS generates an invalid 
> query against the PostgreSQL catalog when adding the raster layer.
>

Sounds like a bug to me.

Can you file a ticket with all the necessary information and a minimal
SQL dump to reproduce the issue?
 



-- 
Alessandro Pasotti
QCooperative:  www.qcooperative.net
ItOpen:  www.itopen.it
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Re: [Qgis-user] PostGIS raster layer filtered by attribute

[Thayer Young via Qgis-user]

 Hi Dirk,
I have not seen a bug report for this yet. Would you like me to issue one?
I was able to reproduce that the provider for views of raster tables did work 
in 3.10 but stopped working by 3.14.
-Thayer


On Friday, November 4, 2022 at 08:06:48 AM EDT, Alessandro Pasotti 
 wrote:  
 
 On Fri, Nov 4, 2022 at 12:18 PM  wrote:
>
> Thanks to Thayer and Alesandro.
> I made a lot of tests today. Not all is working, but it's on a good way.
>
> I did not see the "Filter" option on the raster layer in QGIS 3.22 because I 
> searched in the layer properties analog to where the filter is placed for 
> vector layers.
> The filter option works in general but throws a lot of critical errors, when 
> no raster is in  the result of the filter query.
>
> Another solution I tried is to use a view where the raster table is filtered.
> This works in QGIS 3.10 but not in 3.22, where QGIS generates an invalid 
> query against the PostgreSQL catalog when adding the raster layer.
>

Sounds like a bug to me.

Can you file a ticket with all the necessary information and a minimal
SQL dump to reproduce the issue?


-- 
Alessandro Pasotti
QCooperative:  www.qcooperative.net
ItOpen:  www.itopen.it
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Re: [Qgis-user] Exporting, processing and re-importing

[Thayer Young via Qgis-user]

 Hi Magnus,
This is the correct place for asking your questions.
If you have a unique identifier you can join your altered Excel file to your 
original geometry file. From the Layer Properties of the layer with geometry 
choose "Joins" and click the green plus sign in the bottom left. Then choose 
the Excel file and the unique ID that will create the match between both files. 
You can see the results from the attribute table of the geometry file. This 
will be similar to a left join, showing nulls for rows that do not join to the 
geometry. Once you have the join 

If that doesn't work, the easiest is to export as a CSV with the geometry. If 
your geometry is more than points, under the Layer Options I recommend 
exporting GEOMETRY "AS_WKT" (well known text, wikipedia has a good 
explanation). After making your changes, you will then import the file using 
the Delimited Text setting in Data Source Manager.

My understanding is that there is not a database running in the background, but 
QGIS does use SpatiaLite syntax for doing expressions, etc..

As you are good with SQL, I would recommend that you move your data into a 
spatial database, e.g. PostgreSQL with PostGIS extension or SQLite with 
SpatiaLite (single file database). After installing the software you would 
create a database, and create the spatial extension in the database from the 
command line (see the directions on PostGIS.net, etc.). Then in QGIS you can 
connect to the database from the "Browser" panel for the type of database you 
created. You can then use the "Database Manager" in QGIS to import the data, or 
shp2pgsql etc.. You can also use Database Manager to query the data and add 
those queries to the map, just remember to have a unique ID and a geometry 
column.   

If you need further help with any of this please write back to the listserve. 
The documentation can be found here if you want more detail than I have 
provided:https://docs.qgis.org/3.28/en/docs/user_manual/
-Thayer

  
 > Date: Sun, 6 Nov 2022 20:22:36 +0100
> From: Magnus MacHale-Gunnarsson 
> To: Qgis-user@lists.osgeo.org
> Subject: [Qgis-user] Exporting, processing and re-importing
> Message-ID: <25397fd7-1812-4344-8fe3-03e8a5db1...@magnusgunnarsson.se>
> Content-Type: text/plain;    charset=utf-8
> 
> Hello.
> 
> (I?m not at all certain this is the right forum for this question, so 
> apologies if it isn?t and please point me to a better forum.)
> 
> I?m using QGIS 3.26.6 Buenos Aires on MacOS Ventura 13.0.
> 
>I have a layer with lots of shapes, and I need to add a field or two, to some 
>of the objects. I could do that in QGIS, but the interface is awkward if you 
>have a few hundred objects to go through, so I?d like to export the data, 
>group and filter as I like, and then re-import the processed file into QGIS.
> 
>1. Can I export just the attributes table, do the processing, and reimport? If 
>so, how  do I connect the reimported attributes to the objects? Will the 
>reimported attributes table clash with the existing one?
> 
> 2. Or is it better to export the attributes WITH the coordinates? Which 
> format is suitable for that? (I find row-based formats like csv or Excel 
> easiest, but that is not too important.) I tried exporting to Excel, with 
> ?Geometry? checked, but when I tried to re-import that file again the 
> coordinates were not included.
> 
> 3. I understand there is a relational database in the background. I?m very 
> used to SQL. Is it better to work directly with that database, and not worry 
> about importing and exporting? How do I access it?
> 
>   MagnusMG

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Re: [Qgis-user] PostGIS raster layer filtered by attribute

[Thayer Young via Qgis-user]

Hi Dirk,
I have looked into this and found no easy solution. As you have noticed there 
is no "Provider Feature Filter" in the Source tab of the layer properties for a 
raster layer. The next obvious path would be to write a SELECT statement in an 
SQL Window in the Database Manager and "Load as New Layer", but this is only 
set up for geometry columns, not raster. Next is to create a view or a 
materialized view with the associated indexes in the database and try adding 
that to QGIS using the four methods for adding layers. All of these result in 
the same PostGIS errors, that a primary key can not be found for the raster 
table, that the raster layer is invalid and that the "Data type size for band 1 
could not be found: num bands is: 0 and the type size map for bands contains: 0 
item(s)".  

I have searched the QGIS issues page on Github and not found anything beyond 
the basic functionality of adding PostGIS rasters. I believe that if you are 
interested in this functionality you should file a feature request on the 
qgis/QGIS issues page on Github.
This is what I found, note that all of the issues are closed: 
https://github.com/qgis/QGIS/issues?q=is%3Aissue+postgresraster+
-Thayer


 > Date: Wed, 2 Nov 2022 12:08:08 +
> From: 
> To: 
> Subject: [Qgis-user] PostGIS raster layer filtered by attribute
> Message-ID: <8766215b88b84d3ba770e6c0a7979...@stadt-koeln.de>
>Content-Type: text/plain; charset="us-ascii"
> 
>Hi list,
> 
> I import TIFF-files into a PostgreSQL/PostGIS table with FME. In addition to 
> the raster column my table has some more columns.
> Is it possible to filter the raster layer based on my table by these 
> additional columns?
> It seems that QGIS (up to 3.28) doesn't handle addional columns in raster 
> layers, but maybe someone knows a trick to do so.
> Thanks and regards
>
> Dirk
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Re: [Qgis-user] Qgis-user Digest, Vol 200, Issue 32

[Thayer Young via Qgis-user]

 Hi Krishna,
It may be less frustration for you to try one of the other GTFS plugins. When I 
search "GTFS" in the plugin manager I get 3 other results: AequilibraE, 
GTFS-GO, Networks. Note I have not tried them. 

If you want to persist with GTFS Loader, I would think that the best thing is 
to open an issue and paste in your stack trace or your image. the Github 
repository looks kind of stale, no activity in the last two years, so you might 
not get a reply.  https://github.com/ctu-geoforall-lab/qgis-gtfs-plugin   I did 
find an e-mail address at the top of each page of code. For example you can 
find it here:  
https://github.com/ctu-geoforall-lab/qgis-gtfs-plugin/blob/master/GTFS.py   By 
the way, there is an open issue about it crashing QGIS when trying to open GTFS 
files. At least you got an error with a stack trace :-)  The person who opened 
the issue did not even get an error.  
https://github.com/ctu-geoforall-lab/qgis-gtfs-plugin/issues/11
-Thayer



On Wednesday, October 26, 2022 at 11:06:31 AM EDT, krishna Ayyala 
 wrote:  
 
 Good Morning Thayer,
Thanks for the reply. From the GTFS loader plugin information page, I was 
unable to figure out the email id of the developer. By any chance, if you have 
can you please provide me. I will write to him about the issue that I am 
addressing with GTFS loader.
Regards.
On Tue, Oct 25, 2022 at 11:49 AM Thayer Young via Qgis-user 
 wrote:

This appears to be an issue that others are having with this plugin also: 
https://github.com/ctu-fgis/2020-b-qgis-gtfs-plugin/issues/24
I think your best approach will be to contact the plugin developer. As it is 
probably not a problem with the QGIS code.

I believe that GTFS is xml based so you may be able to parse the data in other 
ways, depending on how big your file is.

-Thayer

--
 > Date: Tue, 25 Oct 2022 09:49:09 -0600
> From: krishna Ayyala 
> To: qgis-user 
> Subject: [Qgis-user] GTFS Loader
> Message-ID:
>      
> Content-Type: text/plain; charset="utf-8"
>
> 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.
>
> [image: image.png]
> -- next part --
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Re: [Qgis-user] Qgis-user Digest, Vol 200, Issue 32

[Thayer Young via Qgis-user]

This appears to be an issue that others are having with this plugin also: 
https://github.com/ctu-fgis/2020-b-qgis-gtfs-plugin/issues/24
I think your best approach will be to contact the plugin developer. As it is 
probably not a problem with the QGIS code.

I believe that GTFS is xml based so you may be able to parse the data in other 
ways, depending on how big your file is.

-Thayer

--
 > Date: Tue, 25 Oct 2022 09:49:09 -0600
> From: krishna Ayyala 
> To: qgis-user 
> Subject: [Qgis-user] GTFS Loader
> Message-ID:
>      
> Content-Type: text/plain; charset="utf-8"
>
> 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.
>
> [image: image.png]
> -- next part --
> An HTML attachment was scrubbed...
> URL: 
> 
> -- next part --
> A non-text attachment was scrubbed...
> Name: image.png
> Type: image/png
> Size: 53405 bytes
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> URL: 
> 

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Re: [Qgis-user] Georeferencer: where is it in UI?

[Thayer Young via Qgis-user]

 Hi Richard,
Ok, this is a standard MacOS feature not QGIS.  It looks like there are 
packages for Linux you can install, kupfer looks appropriate, but I don’t know 
anything about it:
https://askubuntu.com/questions/203851/any-search-tool-for-lxde-menu

-Thayer

On Friday, August 5, 2022, 04:20:32 PM EDT, Richard Greenwood 
 wrote:  
 
 On Fri, Aug 5, 2022 at 1:17 PM Thayer Young via Qgis-user 
 wrote:

 Hi Matt,
A good strategy for finding stuff in QGIS, in addition to the documentation:  
There is a search bar for stuff listed in the menus at the top of the user 
interface. It is the first listing in the Help menu at the top right. I know it 
works in MacOS.


That sounds very useful. I'm on Linux and I can't find what you describe. I 
have a help downdown menu and a help toolbar. Neither have an interactive 
search. Can you describe it in more detail or send a screenshot so that I am 
sure that I'm just not seeing it?
Thanks,Rich 


For things that are not in the top menus you can use the search bar in the 
bottom left of the main QGIS window.

-Thayer

===
On Friday, August 5, 2022 at 01:53:33 PM EDT, 
 wrote:  Date: Fri, 5 Aug 2022 10:48:46 -0700
From: Matt Wilkie 
To: qgis-user 
Subject: Re: [Qgis-user] Georeferencer: where is it in UI?
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

 Hi,

I'm back to Qgis after some time away. I read in v3.26 changelog that
Georefencer can now handle vectors
<https://www.qgis.org/en/site/forusers/visualchangelog326/index.html#feature-georeferencing-vector-layers-in-georeferencer>.
Awesome! But, where is it supposed to be found in the user interface?

Docs say it's in Raster
<https://docs.qgis.org/3.22/en/docs/user_manual/working_with_raster/georeferencer.html>
somewhere, which makes sense given the feature's heritage. But I don't see its
icon <https://docs.qgis.org/3.22/en/_images/mGeorefRun.png> or the word
'Georeferencer' in any toolbar or in any of the menu items I have in my
Qgis install, including under "Plugins >> Manage and Install" and the
Processing Toolbox. How do I get to it?

Thanks,
-Matt

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-- 
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Re: [Qgis-user] Georeferencer: where is it in UI?

[Thayer Young via Qgis-user]

 Hi Matt,
A good strategy for finding stuff in QGIS, in addition to the documentation:  
There is a search bar for stuff listed in the menus at the top of the user 
interface. It is the first listing in the Help menu at the top right. I know it 
works in MacOS.

For things that are not in the top menus you can use the search bar in the 
bottom left of the main QGIS window.

-Thayer

===
On Friday, August 5, 2022 at 01:53:33 PM EDT, 
 wrote:  Date: Fri, 5 Aug 2022 10:48:46 -0700
From: Matt Wilkie 
To: qgis-user 
Subject: Re: [Qgis-user] Georeferencer: where is it in UI?
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

 Hi,

I'm back to Qgis after some time away. I read in v3.26 changelog that
Georefencer can now handle vectors
.
Awesome! But, where is it supposed to be found in the user interface?

Docs say it's in Raster

somewhere, which makes sense given the feature's heritage. But I don't see its
icon  or the word
'Georeferencer' in any toolbar or in any of the menu items I have in my
Qgis install, including under "Plugins >> Manage and Install" and the
Processing Toolbox. How do I get to it?

Thanks,
-Matt

===
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Re: [Qgis-user] Simplify geometry - snap to grid

[Thayer Young via Qgis-user]

 Hi Klaus and Patrick, 

With respect to 'Snap to grid', I would like to chime in that the grid is 
usually meant to be quite fine. For example, on a scale smaller than meter or a 
foot. In the case of the 'Simplify' tool, set to 'Snap to grid', this is 
controlled by the 'Tolerance', you will note that the units change according to 
the CRS units of the selected layer. It is frequently used to snap points and 
lines together for use with networks. Because, while your line file may look 
like the nodes are all connected to each other, in actuality they may be off by 
a few milli-, micro- or nanometers so the routing tool will see this as the two 
lines not being connected. You can increase the Tolerance upwards and give your 
vector a pixelated look to it.

Just a guess, I would presume the layer's bounding box is used to set the grid. 
If that is not enough of an explanation please do look up the code references 
given by Andrea (I have left them inline below). 

-Thayer


On Wednesday, June 29, 2022 at 08:29:23 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
 > Regards.
> Andrea Giudiceandrea
> 
> [1] 
> https://api.qgis.org/api/3.22/classQgsMapToPixelSimplifier.html#a0b97d82a3abd0876ce529ba9d9cfd412
> [2] 
> https://github.com/qgis/QGIS/blob/e113457133fe5d7c3f5e3b90a2795b8b691ae269/src/core/qgsmaptopixelgeometrysimplifier.cpp#L183-L229
> [3] 
> https://docs.qgis.org/3.22/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html?highlight=simplify#snap-points-to-grid
>  
> 
> --
> Date: Wed, 29 Jun 2022 11:57:47 +1200
> From: Patrick Dunford 
> To: qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] Simplify geometry - snap to grid
> Message-ID: <62ff8391-0f43-92ae-5c11-c324f2baf...@gmail.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Is this the grid you see in View -> Decorations -> Grid ?
>
> On 29/06/22 07:50, Delaz J via Qgis-user wrote:
> Hi Klaus,
>
> Just a guess: the only snap to grid thing I know about is 
> https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#snapping-on-custom-grid.
>  
> Worth a check?
>
> Regards,
>
> Harrissou
>
> Le 28/06/2022 ? 15:54, Klaus Mith?fer via Qgis-user a ?crit?:
>> hello,
>>
>> with the simplify tool in QGIS you can simplify geometries using 
>> either ?Douglas-Peucker Algorithm, Visvalingam-Algorithm or snap to 
>> grid. I understand the algorithms, but how the grid snapping work? 
>> Where is is the grid defined? I don't get that point. maybe someone 
>> can explain.
>>
>> Thanks an kind regards
>> Klaus

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Re: [Qgis-user] Path along a line

[Thayer Young via Qgis-user]

 Sorry I meant to say that 'Service area (from layer)' is what you want, but 
that you may need to select points individually if your service areas 
overlap.'Service area from point' requires you to enter the coordinates 
manually for the points.
-Thayer

On Monday, June 27, 2022 at 04:19:41 PM EDT, Thayer Young 
 wrote:  
 
  Hi Krishna,
Chris was correct about 'Service area (from point)' being the tool you want. I 
think your problem is that the travel cost is measured in meters not feet.
I will add some detail to his answer. First you should set the 'Path type to 
calculate' to shortest, and the 'travel cost' to be 304.8. It seems to use 
meters as the distance cost unit. Also the output seems to be a little wonky if 
the service areas overlap. You may want to select each point manually and run 
the tool separately each time. 

-Thayer


On Monday, June 27, 2022 at 03:00:18 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
Date: Mon, 27 Jun 2022 12:23:23 -0600
From: krishna Ayyala 
To: chris hermansen 
Cc: qgis-user 
Subject: Re: [Qgis-user] Path along a line
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Chris,
Thanks for the reply. This does not work. This is only creating a shortest
path connecting all the 5 points. But,I am looking for a path of 1000ft
from each of these points.

Regards.

On Mon, Jun 27, 2022 at 11:37 AM chris hermansen 
wrote:

> Krishna and list
>
> On Mon, Jun 27, 2022 at 9:58 AM krishna Ayyala via Qgis-user <
> qgis-user@lists.osgeo.org> wrote:
>
>> Hello,
>> I  have a roads shapefile.  I also have a points shape file with 5 points
>> which are on top of these roads. I wish to extract the roads that are
>> 1000ft along the path from each of these points. I am not looking for roads
>> within 1000ft buffer. I am looking for roads along the path. Can anyone
>> help me with this?
>>
>
> Have you looked at Processing > Service area (from point)?  Seems to me
> this might do the job for you.
>
>
> --
> Chris Hermansen ? clhermansen "at" gmail "dot" com
>
> C'est ma fa?on de parler.
>
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Re: [Qgis-user] Path along a line

[Thayer Young via Qgis-user]

 Hi Krishna,
Chris was correct about 'Service area (from point)' being the tool you want. I 
think your problem is that the travel cost is measured in meters not feet.
I will add some detail to his answer. First you should set the 'Path type to 
calculate' to shortest, and the 'travel cost' to be 304.8. It seems to use 
meters as the distance cost unit. Also the output seems to be a little wonky if 
the service areas overlap. You may want to select each point manually and run 
the tool separately each time. 

-Thayer


On Monday, June 27, 2022 at 03:00:18 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
Date: Mon, 27 Jun 2022 12:23:23 -0600
From: krishna Ayyala 
To: chris hermansen 
Cc: qgis-user 
Subject: Re: [Qgis-user] Path along a line
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Chris,
Thanks for the reply. This does not work. This is only creating a shortest
path connecting all the 5 points. But,I am looking for a path of 1000ft
from each of these points.

Regards.

On Mon, Jun 27, 2022 at 11:37 AM chris hermansen 
wrote:

> Krishna and list
>
> On Mon, Jun 27, 2022 at 9:58 AM krishna Ayyala via Qgis-user <
> qgis-user@lists.osgeo.org> wrote:
>
>> Hello,
>> I  have a roads shapefile.  I also have a points shape file with 5 points
>> which are on top of these roads. I wish to extract the roads that are
>> 1000ft along the path from each of these points. I am not looking for roads
>> within 1000ft buffer. I am looking for roads along the path. Can anyone
>> help me with this?
>>
>
> Have you looked at Processing > Service area (from point)?  Seems to me
> this might do the job for you.
>
>
> --
> Chris Hermansen ? clhermansen "at" gmail "dot" com
>
> C'est ma fa?on de parler.
>
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Re: [Qgis-user] Qgis-user Digest, Vol 196, Issue 28

[Thayer Young via Qgis-user]

Dear QGIS-user subscribers, 

My sincerest apologies for messing up (again), and sending the entire message 
digest in my answer.
-Thayer
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Re: [Qgis-user] Using OS Raster Data in QGIS

[Thayer Young via Qgis-user]

 Rasters sometimes have more than one file with the same name for each raster. 
A good rule of thumb is to open the largest file. The documentation for adding 
rasters to a project will help you with the procedure. The link below is to the 
current Long Term Release documentation 3.22. 3.8 is quite old. 
https://docs.qgis.org/3.22/en/docs/training_manual/rasters/index.html

You may also be using vector data from Ordinance Survey, so from the Data 
Source Manager click on vector on the left and select Directory for source type 
and UK.NTF2 from type and then navigate to your data file. 
https://gdal.org/drivers/vector/ntf.html#vector-ntf
-Thayer



On Saturday, June 25, 2022, 12:01:28 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
 
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Today's Topics:

  1. Re: Dimensioning in QGIS (chris hermansen)
  2. Re: Dimensioning in QGIS (Nicolas Cadieux)
  3. Re: Dimensioning in QGIS (Alexandru Munteanu)
  4. (DEREK Beddis)
  5. Re: Dimensioning in QGIS (David Strip)


--

Message: 1
Date: Fri, 24 Jun 2022 12:18:13 -0700
From: chris hermansen 
To: Nicolas Cadieux 
Cc: Zolt?n Siki , i...@jcis.net.au, qgis-user
    
Subject: Re: [Qgis-user] Dimensioning in QGIS
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

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 <
qgis-user@lists.osgeo.org> 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 ? 08:03, Zolt?n Siki via Qgis-user <
> qgis-user@lists.osgeo.org> a ?crit :
>
> ?
> 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 ?rta (id?pont: 2022.
> j?n. 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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>>
>
>
> --
> ?dv.
> Siki Zolt?n
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-- 
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C'est ma fa?on de parler.
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--

Message: 2
Date: Fri, 24 Jun 2022 16:20:18 -0400
From: Nicolas Cadieux 
To: chris hermansen 
Cc: Zolt?n Siki , 

Re: [Qgis-user] polygon fills from different shapefiles

[Thayer Young via Qgis-user]

 to quote my favorite movie: "Rock and Roll, hello Cleveland!"

-Thayer

On Tuesday, June 21, 2022 at 04:39:28 PM EDT, Sebastian Gutwein 
 wrote:  
 
 And even easier is to put them all in a group then copy the style from one 
layer and paste it onto the group. This will apply the style to all layers in 
the group. 

On Tue, Jun 21, 2022 at 3:22 PM Thayer Young via Qgis-user 
 wrote:

 A method that is a little easier than saving out the style file, is that you 
can just right click on the layer that you styled, then third from the bottom 
in the menu select:   Styles: Copy Style: All Style CategoriesAnd then you can 
paste the style to the rest of your layers using:  Styles: Paste Style: All 
Style Categories
-Thayer


On Tuesday, June 21, 2022 at 03:00:36 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
i have four different geologic maps that i have imported as shapefiles.
The files have filled polygons that have the name of the geologic formation
in the attribute tables.  i would like to have a common colour for each
polygon of identical age/name for all the map sheets.  Each map sheet has a
similar list of formations, but some of the formations are different for
each map sheet.
What is the most efficient way to make the identically named polygons
displayed with the same colour?  Should i add a column in each attribute
table and put a formation code in for each one manually or can i add an RGB
colour for each formation in the attribute table? or, do i need to
categorize and  classify these in the layer properties table after i have
added formation code in the attribute table?
i hope that my question is clear.

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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(631) 241-1018

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Re: [Qgis-user] polygon fills from different shapefiles

[Thayer Young via Qgis-user]

 A method that is a little easier than saving out the style file, is that you 
can just right click on the layer that you styled, then third from the bottom 
in the menu select:   Styles: Copy Style: All Style CategoriesAnd then you can 
paste the style to the rest of your layers using:  Styles: Paste Style: All 
Style Categories
-Thayer


On Tuesday, June 21, 2022 at 03:00:36 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
i have four different geologic maps that i have imported as shapefiles.
The files have filled polygons that have the name of the geologic formation
in the attribute tables.  i would like to have a common colour for each
polygon of identical age/name for all the map sheets.  Each map sheet has a
similar list of formations, but some of the formations are different for
each map sheet.
What is the most efficient way to make the identically named polygons
displayed with the same colour?  Should i add a column in each attribute
table and put a formation code in for each one manually or can i add an RGB
colour for each formation in the attribute table? or, do i need to
categorize and  classify these in the layer properties table after i have
added formation code in the attribute table?
i hope that my question is clear.

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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Re: [Qgis-user] most efficient way to digitize polygons

[Thayer Young via Qgis-user]

 Hi Byron,
  I recommend making one large polygon and then using the Split Features tool 
to cut individual polygons out of the original polygon. Just remember to select 
the polygon that you want to split before using the tool, and start and finish 
the split line on the outside of the polygon.  This effectively eliminates 
topological errors between the adjacent polygons. Which means that there will 
not be any gaps or overlaps between them, since the splitting process will 
generate duplicate points in each polygon for every mouse click along the split 
path.
  The only disadvantage is that you will have to manually go back and fill in 
the attributes for each polygon. Know that the new polygon that is split from 
the original will inherit the attributes of the original.
  If you need to adjust boundaries later, you should use the Snapping Toolbar, 
specifically enable Snapping and enable Topological Editing. When polygons 
share points, if you move a point it will move all polygons that share that 
point.

-Thayer


On Thursday, June 16, 2022 at 03:00:38 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
 
Date: Thu, 16 Jun 2022 09:26:32 -0600
From: Firstname Lastname 
To: Qgis-user@lists.osgeo.org
Subject: [Qgis-user] most efficient way to digitize polygons
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

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] Adding Geometry table to QGIS

[Thayer Young via Qgis-user]

 Hi Yamen,
It's hard to tell without more information about your table definition and how 
you are connecting to the database.
You may want to try making a view, it looks like you need a unique ID and 
correctly formulated geometry column:
https://answerbun.com/
-Thayer



On Wednesday, June 1, 2022 at 09:03:15 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  

Date: Wed, 1 Jun 2022 15:02:13 +0200
From: Yamen Tekaji 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Adding Geometry table to QGIS
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Hello all,

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

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

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

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Re: [Qgis-user] Error export .shp to .gpx

[Thayer Young via Qgis-user]

 Hi Mike,
The GPX format has a short list of allowed field names . So either you have to 
convert all your fields to fit that list, or you can use gpx extensions and it 
will allow you to use your designated names. Depending on where you want to 
transfer the GPX file to, your device may not be able to understand the 
extension fields. So converting the fields names to may be your best choice.

You can use the "Export POI" plugin if you are exporting points. You can ignore 
the "Category" input, unless you want to split your file into multiple files 
depending on the value in the "Category" field. You want to set it to export 
three of your fields to the gpx fields: "name", Description "desc", and Comment 
"cmt". If you have more fields you should try combining them with the field 
calculator and then use the POI Exporter.

If you want to try gpx extensions you can scroll down in the QGIS "Export" GPX 
dialog, near the bottom in the "Datasource Options" you should change 
"GPX_USE_EXTENSIONS" to "yes".

There may be other plugins that others can tell you about.

-Thayer


On Saturday, May 28, 2022, 03:00:35 PM EDT, 
 wrote:  

Date: Sat, 28 May 2022 08:14:13 -0400
From: Mike Breiding - Morgantown WV 
To: Qgis 
Subject: [Qgis-user] Error export .shp to .gpx
Message-ID: 
Content-Type: text/plain; charset=utf-8; format=flowed

Greetings,
I get the following error when I try to export .shp to .gpx.
I do not understand what is meant by "Use GPX_USE_EXTENSIONS creation 
option..."

Can any help with this?
Thanks,
WV-Mike


"Export to vector file failed.
Error: Creation of field VERSION failed (OGR error: Field of name 
'VERSION' is not supported in GPX schema. Use GPX_USE_EXTENSIONS 
creation option to allow use of the  element.)"

-- 
Mike Breiding
www.EpicRoadTrips.us

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Re: [Qgis-user] visualize and export coordinates of centroids

[Thayer Young via Qgis-user]

 Hi Francesca,
Assuming that your layer has a geographic coordinate system like 4326. And you 
have found your centroids already:
Use the field calculator to add a new or virtual field with a numeric data 
type, e.g. double, and name it something like "lat". Then in the expression 
area enter the expression: $y  
and press OK. Do the same for "lon" and the expression will be: $x 

If you want to find the centroid of a polygon and its latitude in one step your 
expression would be: y(centroid($geometry)) 
For longitude it would be: x(centroid($geometry)) 

Note that different methods will give you different coordinates for your 
centroid. So you may need to use a spatial join to do your match. 

-Thayer

On Tuesday, May 24, 2022, 06:22:46 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote: 
--
Date: Tue, 24 May 2022 09:52:26 +0200
From: Francesca Parente 
To: QGIS User List 
Subject: [Qgis-user] visualize and export coordinates of centroids
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

Hello group,

I would like to ask you what is in your opinion the best way to identify
the lat-lon attributes of derived centroids in order to export them to an
extra-QGis database where corresponding coordinates should match with
identified locations.

So far I've tried with Geocoding and MMQGIS plugins, but the resulting
attributes table doesn't inlcude the coordinates of geocoded points.

Thanks a lot for any advice!
Francesca

-- 

Francesca Parente

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Re: [Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3 for MacOS 10.14.6

[Thayer Young via Qgis-user]

 Excellent. Happy analyzing. 
-T
On Friday, May 20, 2022, 02:38:34 PM EDT, Walter Alvarez 
 wrote:  
 
 Thank you, Thayer!  That indeed was part of the problem, but I believe another 
problem was that the files were saved in iCloud.  When I took them out of 
iCloud and looked for the hidden Tools window, the DEMs merged properly!  I 
greatly appreciate your help!
Walter


On May 20, 2022, at 6:01 AM, Thayer Young  wrote:
 Hi Walter,
Sometimes after entering parameters the tool window drops behind the main QGIS 
window. Try either moving the QGIS window out of the way or right click the 
QGIS icon in the Dock and select "Show All Windows" and see if you can find it 
again. Hope this helps.

-Thayer

On Friday, May 20, 2022, 06:35:24 AM EDT, qgis-user-requ...@lists.osgeo.org 
 wrote: 
--
Date: Thu, 19 May 2022 14:30:39 -0700
From: Walter Alvarez 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3
    for MacOS 10.14.6
Message-ID: <1855f019-f0cc-4329-9caa-6667a862b...@berkeley.edu>
Content-Type: text/plain; charset="utf-8"

I?m trying to merge either two or twelve 30-m SRTM tiles using QGIS 3.14.3.  In 
either case (2 or 12) I am stopped by the following problem:
Using Raster > Miscellaneous > Merge?
I get the ?Merge" window.  I try to use Input layers > Elements selected > ??"
That takes me to the "Multiple Selection" window, showing the 2 or 12 files I 
want to merge (filenames:  nXXeXXX_1arc_v3 [EPSG:4326]).
After selecting all the files, when I click ?OK?  the "Multiple Selection 
Window? and the ?Merge? window both disappear, and I cannot figure out what to 
do next, or do differently.
I can?t figure out how to get past this problem and merge my tiles.
Thanks for any help you can offer!

Walter
__
Walter Alvarez
Professor of the Graduate School
Department of Earth and Planetary Science
University of California Berkeley


  


__


Walter AlvarezProfessor of the Graduate School
Department of Earth and Planetary Science
University of California Berkeley



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Re: [Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3 for MacOS 10.14.6

[Thayer Young via Qgis-user]

 Hi Walter,
Sometimes after entering parameters the tool window drops behind the main QGIS 
window. Try either moving the QGIS window out of the way or right click the 
QGIS icon in the Dock and select "Show All Windows" and see if you can find it 
again. Hope this helps.

-Thayer

On Friday, May 20, 2022, 06:35:24 AM EDT, qgis-user-requ...@lists.osgeo.org 
 wrote: 
--
Date: Thu, 19 May 2022 14:30:39 -0700
From: Walter Alvarez 
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3
    for MacOS 10.14.6
Message-ID: <1855f019-f0cc-4329-9caa-6667a862b...@berkeley.edu>
Content-Type: text/plain; charset="utf-8"

I?m trying to merge either two or twelve 30-m SRTM tiles using QGIS 3.14.3.  In 
either case (2 or 12) I am stopped by the following problem:
Using Raster > Miscellaneous > Merge?
I get the ?Merge" window.  I try to use Input layers > Elements selected > ??"
That takes me to the "Multiple Selection" window, showing the 2 or 12 files I 
want to merge (filenames:  nXXeXXX_1arc_v3 [EPSG:4326]).
After selecting all the files, when I click ?OK?  the "Multiple Selection 
Window? and the ?Merge? window both disappear, and I cannot figure out what to 
do next, or do differently.
I can?t figure out how to get past this problem and merge my tiles.
Thanks for any help you can offer!

Walter
__
Walter Alvarez
Professor of the Graduate School
Department of Earth and Planetary Science
University of California Berkeley


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Re: [Qgis-user] Vertices

[Thayer Young via Qgis-user]

 Hi  Cipanul ,
You can follow the procedure in the first answer to this GIS Stack Exchange 
question:https://gis.stackexchange.com/questions/381114/displaying-vertex-coordinates-of-polygon-or-line-without-creating-new-layerIn
 step three just use @geometry_part_num as the expression (the full expression 
in the example gives a nicely formatted way to display the coordinates at the 
vertices).Just note that a polygon with 5 sides actually has 6 vertices, since 
the first and last vertex in a polygon are the same. So the 1 and the 6 labels 
will overlap each other.
-Thayer

> Date: Sat, 9 Apr 2022 10:25:22 +
> From: Lazanu Ciprian-C?t?lin 
> To: "qgis-user@lists.osgeo.org" 
> Subject: [Qgis-user] Vertices
> Message-ID: 
> 
>     
> Content-Type: text/plain; charset="iso-8859-2"
> 
> Hello,
> I need help ...
> I want to create a layer with a polygon ... with 5 vertices. I want that 
> vertices to be shown on my layer by their number 1,2,3,4,5 and after that to 
> extract their coord and put them in a table by id (1,2,3,4,5,) and x, y - I 
> use Stereographic - STEREO70 PROJECTION.
> I have a picture to show how l want to see that polygon on my layer and after 
> that l could print it like that.
> Thank you
> Cipanul

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Re: [Qgis-user] relation_aggregate

[Thayer Young via Qgis-user]

 Hi Graeme,
I think this may be a bug, it appears that this worked at some point, 
https://gis.stackexchange.com/questions/222625/qgis-relation-aggregate-how-does-this-work#238265
The QEP referenced above is still open:
QEP 59: Aggregate functions for QGIS expressions · Issue #59 · 
qgis/QGIS-Enhancement-Proposals
but it may not be working anymore?https://github.com/qgis/QGIS/issues/29115
I tried dumping the expression results to a field in field calculator. I am 
able to get output only by referencing field names that are common in both the 
1 and the many table, for example using the relation between Canadian Provinces 
and Regional Districts, only the province UID gives anything besides NULL:
relation_aggregate('RDs_in_Provinces','concatenate',"PRUID")

-Thayer


On Wednesday, April 6, 2022, 07:40:08 AM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
> PUBLIC


> Hello,

> I am having issues getting relate_aggregate to do anything within expression 
> builder. Ideally, I would like a features (1) to (m) attributes table setup 
> correctly with a relationship to allow a user to select attributes based on 
> attribute criteria have the corresponding related features selected / shown 
> on map as related. Given how little I am uncovering online about ways to do 
> this, it might not be possible, but even getting the expression builder to 
> update a field in my features with a count of corresponding values in 
> attributes is not updating feature's values, I am wondering if I am doing 
> something wrong. Should this work?

> Within select by attributes for the feature table:
> relation_aggregate( 'relation _ID','count',1) > 3

> The preview of the expression returns a value for a feature (without the >3 
> at end), but when I try to calculate a field of this count - every value 
> returns NULL. With the >3 it does not work at all to select anything.

> It does look like 'relation_aggregate( 'relation _ID','count',1)' is fine for 
> the basis of evaluating a field of values based on preview but it returns 
> null on running the field calculator.

> I am using QGIS 3.16

> Regards,
> Graeme


> PUBLIC

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Re: [Qgis-user] Qgis on Windows 10 ARM

[Thayer Young via Qgis-user]

 Hi Rayfson,
You will need an x86 emulator to run QGIS on ARM. This article says you need to 
upgrade to Windows 11 to get the Microsoft 
emulator:https://www.pcmag.com/news/microsofts-x86-64-bit-emulator-for-arm-devices-is-exclusive-to-windows
FYI, Rosetta2 is the MacOS ARM emulator, I can verify that QGIS runs under 
Rosetta2.
-Thayer

On Saturday, March 19, 2022, 05:39:15 PM EDT, 
qgis-user-requ...@lists.osgeo.org  wrote:  
--
Date: Sat, 19 Mar 2022 17:37:12 -0400
From: rayfson souza 
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Qgis-user Digest, Vol 193, Issue 44
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

I have a Samsung Galaxy Book with ARM processor running Windows 10. No qgis
installer works on this notebook. Is there an updated version of QGIS for
this processor and OS? I can't find a download for it.

Processor: Snapdragon (TM) 7c Gen 2 @.55GHz 2.55GHz

Ram: 4GB

64-bit operating system, ARM-based processor

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Re: [Qgis-user] Qgis-user Digest, Vol 193, Issue 16

[Thayer Young via Qgis-user]

 I would bet the DEM is in "UTM", probably either zone 11N or 12N for northern 
hemisphere, you can check the linked image to figure out which one: 
https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system#/media/File:Utm-zones-USA.svg
  Try using the Assign Projection tool under Raster: Projections. Search for 
something like "UTM 11", and try one or more of those. Less likely would be 
Idaho State Plane.
-Thayer


On Saturday, March 5, 2022, 03:00:37 PM EST, 
qgis-user-requ...@lists.osgeo.org  
wrote:Date: Sat, 5 Mar 2022 10:10:59 -0700
From: David Witton 
To: qgis-user 
Subject: [Qgis-user] CRS question
Message-ID:
    
Content-Type: text/plain; charset="utf-8"

I have a project with 2 layers - one is Google maps, the other a DEM
created with LAStools. Both layers have a CRS of EPSG:3857 as viewed in the
Layer Properties - Information dialog.

However, the DEM is displayed in NIgeria, when it should be in Idaho.

I'm a total newbie at this, so I bet I missed something simple.

-- 
David Witton
307 413 2072
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