[PROJ] Big grid files

[Michael Sumner]

For storage what about Source Cooperative? https://source.coop/

Lots of groups putting up rather large datasets with no cost implications.

Cheers, Mike

On Sun, Apr 27, 2025, 22:55 Even Rouault via PROJ <proj at lists.osgeo.org>
wrote:

>
> 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.
>> _______________________________________________
>> PROJ mailing list
>> PROJ at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/proj
>>
>
> _______________________________________________
> PROJ mailing listPROJ at lists.osgeo.orghttps://lists.osgeo.org/mailman/listinfo/proj
>
> -- http://www.spatialys.com
> My software is free, but my time generally not.
>
> _______________________________________________
> PROJ mailing list
> PROJ at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/proj
>
Michael Sumner
Research Software Engineer
Australian Antarctic Division
Hobart, Australia
e-mail: mdsumner at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20250428/9e68cfca/attachment-0001.htm>