I have recently downloaded QGIS on my Mac to preform an analysis for my dissertation.

I am trying to convert my raster data to polygon data using the gdal_polygonize.py tool provided by QGIS.

Whenever I try to use any of the gdal software I get the error message: "/bin/sh: gdal_polygonize.py: command not found"

Can anyone help me solve this problem? I really need to use this feature for my analysis.

  • did you install the qgis-python package?
    – Ian Turton
    Commented Jun 14, 2018 at 14:58
  • I have python 3.6.5 installed on my computer and I downloaded the packages which were provided with the QGIS download. Is there a separate qgis-python package I need to install? Commented Jun 14, 2018 at 15:01
  • I don't know about Macs but there is on proper unix boxes.
    – Ian Turton
    Commented Jun 14, 2018 at 15:02

1 Answer 1


I am working with Xubuntu 18.04 and installed QGIS 3.4 I have the same message when I want to convert raster image to polygone. executing give this answer: GDAL command: gdal_polygonize.py /home/tec/Documents/QGISdata/AdnMarseille/GeoTiff/AdnPtEt4kW67dB.tif /tmp/processing_cf2a6bfaede3420da00aeb236e0c592d/37a5a44485004d109c76619232bf7bb1/OUTPUT.shp -b 3 -f "ESRI Shapefile" None DN GDAL command output: /bin/sh: 1: gdal_polygonize.py: not found

with older version of QGIS it works fine when the names of files are short and the color image is bue.

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