[PROJ] Big grid files

[Even Rouault]

Le 24/04/2025 à 21:51, Mike Taves via PROJ a écrit :
>
> There is Git Large File Storage (Git LFS), which has a limit of 2GB.
>
Yes, but there are billing / bandwidth implications. I remember we had 
it enabled, but CI cloning typically exhausted the allowed free bandwidth.

Javier, maybe you can try using gdal_translate -scale X X X X -ot UInt16 
-co COMPRESS=DEFLATE -co TILED=YES -co PREDICTOR=2 with the appropriate 
scaling values ?

Or gdal_translate -co DISCARD_LSB=X -co COMPRESS=DEFLATE -co TILED=YES 
-co PREDICTOR=3  to nullify least signifcant bits of the mantissa.


>
> On Fri, 25 Apr 2025, 04:37 Javier Jimenez Shaw via PROJ, 
> <proj at lists.osgeo.org> wrote:
>
>     Hi
>
>     I am playing with the new American geoid model SGEOID2022
>
>     After compressing with this command (can I do it better?)
>     gdal_translate sgeoid2022.tif sgcomp.tif -co COMPRESS=DEFLATE -co
>     TILED=YES -co PREDICTOR=3
>     I get a 110 MB file (and it is only one band. No velocities).
>
>     GitHub has a limit of 100MB:
>     https://docs.github.com/en/repositories/working-with-files/managing-large-files/about-large-files-on-github
>
>     Just to let you know.
>
>     Cheers,
>     Javier.
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