I am carrying out some analysis in python (using Anaconda), I have a binary raster and want to perform a geodesic distance calculation from all areas with a value of 1- I can do this within QGIS using the proximity raster tool. In python I have been using gdal, however the gdal_proximity function that QGIS uses does not seem to be available, I have been using the gdal documentation https://gdal.org/python/ and cannot see it there either.

Is this just unavailable when using gdal in python and, if so, is there an alternative?


Gdal_proximity is in fact a py file that uses gdal.ComputeProximity(srcband,dstband,options) You can check that .py here: https://www.gdal.org/gdal_proximity.html The source code is here: https://svn.osgeo.org/gdal/trunk/gdal/swig/python/scripts/gdal_proximity.py

As you can see in the last part of the source code it uses gdal.ComputeProximity method. Therefore if you don't want to call Gdal_proximity.py you can use a very simple python example as:

from osgeo import gdal

src_ds = gdal.Open('DEM.tif')

drv = gdal.GetDriverByName('GTiff')
dst_ds = drv.Create( dst_filename,
                     src_ds.RasterXSize, src_ds.RasterYSize, 1,

dst_ds.SetGeoTransform( src_ds.GetGeoTransform() )
dst_ds.SetProjection( src_ds.GetProjectionRef() )

dstband = dst_ds.GetRasterBand(1)

# In this example I'm using target pixel values of 100 and 300. I'm also using Distance units as GEO but you can change that to PIXELS.

You can check documentation links above for more information.

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