[PROJ] Big grid files

[Even Rouault]

Le 19/05/2025 à 16:33, Jack Riley - NOAA Federal a écrit :
> I read in 
> https://proj.org/en/stable/specifications/geodetictiffgrids.html#general-description that 
> files hosted on the CDN support Signed/Unsigned Int 16 and Int 32.  
> Might this be expanded to include Int 8, given its support in 
> GDAL>=3.7.0: 
> https://gdal.org/en/stable/development/rfc/rfc87_signed_int8.html

That could potentially, but I'd suspect that the usage of compression + 
Predictor=2  on a scaled to Int8 file (actually I believe you'd rather 
want UInt8 if using scaling) stored on 16 bit should lead to files that 
are only slightly bigger than if actually stored on Int8/UInt8. To be 
verified by experimentation on your datasets.


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