[gdal-dev] Add source no-data masking to proximity computation

[Daniel Evans]

Hello,

I recently submitted a pull request against GDAL that adds an option that
causes GDALComputeProximity to take into account areas of no data within
the input raster and updates gdal_proximity.py with a -use_nodata flag.
This pull request is here https://github.com/OSGeo/gdal/pull/49

Is this likely to be accepted? It saves a processing step to re-add no data
areas when working with certain tools. Do any changes need to be made
elsewhere?

Thanks,
Daniel.
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