[GIS] gdal_polygonize returns with a strange error

gdalpolygonizepython

i'm trying to execute gdal_polygoinize.py command.
I have a main python method that takes in input a raster file and a output shapefile, and then calls a method named polygonize.py that builds and try to execute the gdal_polygonize command.

The code is:

format = "ESRI Shapefile"
command_poligonize = "gdal_polygonize.bat " + \
                        + input_raster + ' '\
                         '-f ' + '"' + format + '"'+ \
                         shape_output
status=subprocess.call(command_poligonize, shell=True)

i tryed also with the os.system() method:

os.system(command_poligonize)

Executing the command:

print('DEBUG: comand: ' + command_poligonize)

i obtain the correct gdal_polygonize invocation, like:

gdal_polygonize.py input.tif -f "ESRI Shapefile" output.shp

The error description is the following:

  File "C:\OSGeo4W64\bin\gdal_polygonize.py", line 209, in <module> 
     callback = prog_func )
 File "C:\Python35\lib\site-packages\osgeo\gdal.py", line 1636, in Polygonize
     return _gdal.Polygonize(*args, **kwargs)
 RuntimeError: Object given is not a Python function

Any suggestion?

I tryed to run the command by itself, like: 

gdal_polygonize.py input.tif -f "ESRI Shapefile" output.shp

and it return with the following error:

  File "C:\OSGeo4W64\bin\gdal_polygonize.py", line 209, in <module> 
     callback = prog_func )
 File "C:\Python35\lib\site-packages\osgeo\gdal.py", line 1636, in Polygonize
     return _gdal.Polygonize(*args, **kwargs)
 RuntimeError: Object given is not a Python function

I'm using Python35 and Gdal 2.0.2 released 2016/01/26.

Best Answer

Running gdal_polygonize.py on Windows, the problem does seem to be with the callback function (used to show progress in the terminal).

A workaround is to set the -quiet or -q flag, e.g.:

gdal_polygonize.py -q input.tif -f "ESRI Shapefile" output.shp

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