Bug report #17846

Polygonize (raster to vector) fails

Added by Andreas Neumann about 2 years ago. Updated 12 months ago.

Status:Closed
Priority:High
Assignee:-
Category:Rasters
Affected QGIS version:master Regression?:No
Operating System:Windows 7 (OSGeo4W) Easy fix?:No
Pull Request or Patch supplied:No Resolution:fixed/implemented
Crashes QGIS or corrupts data:No Copied to github as #:25741

Description

When running the Menu "Raster" --> "Conversion" --> "Polygonize (raster to vector)" command, which internally uses "gdal_polygonize" the algorithm fails with the following error message:

Processing algorithm...
Algorithm 'Polygonize (raster to vector)' starting...
Input parameters:
{ 'INPUT' : 'C:/temp/dtm_extract_test.tif', 'BAND' : 1, 'FIELD' : 'DN', 'EIGHT_CONNECTEDNESS' : True, 'OUTPUT' : 'C:/temp/test_hs.shp' }

GDAL command:
cmd.exe /C gdal_polygonize.bat C:/temp/dtm_extract_test.tif "C:/temp/test_hs.shp" -8 -b 1 -f "ESRI Shapefile" None DN
GDAL command output:
File "C:\Program Files\OSGEO4~1\apps\Python36\lib\site.py", line 177 
file=sys.stderr) 
^ 
SyntaxError: invalid syntax 
Execution completed in 0.19 seconds
Results:
{'OUTPUT': <QgsProcessingOutputLayerDefinition {'sink':C:/temp/test_hs.shp, 'createOptions': {'fileEncoding': 'UTF-8'}}>}

Loading resulting layers
The following layers were not correctly generated.
C:/temp/test_hs.shp
You can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.

See also the screenshot attached for the same error message in a screenshot.

gdal_polygonize_error.png (54.3 KB) Andreas Neumann, 2018-01-12 11:57 AM

dtm_extract_test.zip - Binary GeoTiff for raster to vector conversion (114 KB) Andreas Neumann, 2018-01-12 11:59 AM


Related issues

Related to QGIS Application - Bug report #17298: Processing: gdal merge python error on QGIS 3 Closed 2017-10-17

History

#1 Updated by Andreas Neumann about 2 years ago

attaching sample file for raster to vector conversion (binary Geotiff)

#2 Updated by Antonio Viscomi about 2 years ago

Also in Windows10(1709)x64 (QGIS Master build fa2aff18e5) polygonize do not works and came out with the same error log

#3 Updated by Alexander Bruy about 2 years ago

This same issue as #17298 and probably not related to the Processing itself.

#4 Updated by Alexander Bruy about 2 years ago

#5 Updated by Nyall Dawson 12 months ago

  • Resolution set to fixed/implemented
  • Status changed from Open to Closed

This should be fixed in recent releases

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