gdal raster proximity - perhaps a --separate-bands feature?

[PostholerCom]

Feature description

Consider --target-values 10,20,30
proximity outputs nearest to any of the above values.

Maybe a switch such as --separate-bands that could have output for each in its own band:
band 1: proximity solely to value 10
band 2: proximity solely to value 20
etc...

With that, you could do it in a single pipeline step. Otherwise, it gets a bit messy.

gdal raster proximity is absolutely one of the coolest new features in CLI.

Thanks!
Scott

Additional context

No response

[jratike80]

gdal raster proximity is absolutely one of the coolest new features in CLI.

I believe that most features have existed in https://gdal.org/en/stable/programs/gdal_proximity.html for a long time.

[PostholerCom]

believe that most features have existed in https://gdal.org/en/stable/programs/gdal_proximity.html for a long time.

It was python, the bane of my existence. ;)

[elpaso]

As @rouault suggested me in a chat a pipeline stacking one invokation of proximity per band works:

gdal raster pipeline stack [ read foo.tif ! proximity -b 1  --target-values 1,2,3 ] [ read foo.tif ! proximity -b 2 --target-values 4,5,6 ] ! write out.tif

so, it's probably not worth it to add another argument to the algorithm, anyway here is my initial attempt at it:
https://github.com/elpaso/gdal/tree/gh_14522-raster-proximity-bands

[PostholerCom]

so, it's probably not worth it to add another argument to the algorithm, anyway here is my initial attempt at it: https://github.com/elpaso/gdal/tree/gh_14522-raster-proximity-bands

Thanks for that! I'll look into it.