[Qgis-user] Polygonize - No result

[Bo Victor Thomsen]

The problem is that the *stand-alone* installation of QGS 3.10 (64 bit 
at least) doesn't set the PYTHONPATH environment variable, so the python 
interpreter can't find the module. However, the "*network installation*" 
of the same QGIS version do set the variable. And that version works 
without a hitch

If you add a custom variable *PYTHONPATH* with value 
*C:\PROGRA~1\QGIS3~1.10\apps\Python37;C:\PROGRA~1\QGIS3~1.10\apps\Python37\Scripts 
*to the stand-alone  version of QGIS 3.10 (and restart the program) the 
"polygonize (raster to vector)" works in this version too.

So I suspect we might have a packaging problem with with the stand-alone 
installation

-- 
Med venlig hilsen / Kind regards

Bo Victor Thomsen


Den 07-01-2020 kl. 10:08 skrev Luigi Pirelli:
> do you have python_gdal installed and/or check that gdal_polygonize.py 
> is available... a osgeo4w packaging problem can result in 
> associate gdal_polygonize.py to a interpreter. In this case, just link 
> or copy/remane gdal_polygonize.py as gdal_polygonize
>
> Luigi Pirelli
>
> **************************************************************************************************
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> **************************************************************************************************
>
>
> On Sun, 5 Jan 2020 at 21:43, Lene Fischer <lfi at ign.ku.dk 
> <mailto:lfi at ign.ku.dk>> wrote:
>
>     Hi
>     I´m trying to run Vector to raster (polygonize)
>
>     Suspect it´s the path to GDAL.
>      I get this error message
>
>     QGIS version: 3.10.1-A Coruña
>     QGIS code revision: ef24c526da
>     Qt version: 5.11.2
>     GDAL version: 3.0.2
>     GEOS version: 3.8.0-CAPI-1.13.1
>     PROJ version: Rel. 6.2.1, November 1st, 2019
>     Processing algorithm…
>     Algorithm 'Polygonize (raster to vector)' starting…
>     Input parameters:
>     { 'BAND' : 1, 'EIGHT_CONNECTEDNESS' : False, 'EXTRA' : '', 'FIELD'
>     : 'DN', 'INPUT' : 'C:/gis/nysted_raster/1_7m.tif', 'OUTPUT' :
>     'TEMPORARY_OUTPUT' }
>
>     GDAL command:
>     python3 -m gdal_polygonize C:\gis\nysted_raster\1_7m.tif
>     C:/gis/temp/processing_dc13c7a2a0cf4d22aef37dcd462534db/e5db8073dc414a989e176ea591f28c1c/OUTPUT.gpkg
>     -b 1 -f "GPKG" OUTPUT DN
>     GDAL command output:
>     '\\a00143.science.domain\dlt265\Documents'
>
>     CMD.EXE was started with the above path as the current directory.
>
>     UNC paths are not supported. Defaulting to Windows directory.
>
>     C:\PROGRA~1\QGIS3~1.10\bin\python3.exe: No module named
>     gdal_polygonize
>
>     Execution completed in 0.33 seconds
>     Results:
>     {'OUTPUT':
>     'C:/gis/temp/processing_dc13c7a2a0cf4d22aef37dcd462534db/e5db8073dc414a989e176ea591f28c1c/OUTPUT.gpkg'}
>
>     Loading resulting layers
>     The following layers were not correctly
>     generated.<ul><li>C:/gis/temp/processing_dc13c7a2a0cf4d22aef37dcd462534db/e5db8073dc414a989e176ea591f28c1c/OUTPUT.gpkg</li></ul>You
>     can check the 'Log Messages Panel' in QGIS main window to find
>     more information about the execution of the algorithm.
>
>     Regards
>
>
>
>     Lene Fischer
>     Associate Professor
>
>     University of Copenhagen
>     Department of Geoscience and Natural Resource Management
>     Forest and Landscape College
>     Nødebovej 77a
>     3480 Fredensborg
>     Denmark
>
>
>     MOB +45 40115084
>     lfi at ign.ku.dk <mailto:lfi at ign.ku.dk>
>
>
>
>
>
>
>
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