[gdal-dev] [PROJ] LIBERTIFF / Thread-safe TIFF reader

[Howard Butler]

> On Dec 20, 2024, at 4:56 PM, Even Rouault via gdal-dev <gdal-dev at lists.osgeo.org> wrote:
> 
> Besides reprocessing all of our existing grids,https://github.com/geotiffjs/geotiff.js/tree/master/src/compression seems to show that it doesn't support ZSTD, which would break at least our wonderful cdn.proj.org <http://cdn.proj.org/>interactive map

To throw a wrench into it... 

geotiff.js has LERC support. Floating point LERC TIFFs compressed with a MAX_Z_ERROR to one decimal better than the *stated precision* of the grids would be smaller and more efficiently compressed/decompressed. By maybe a 1/3rd over zstd and deflate.

See this great write-up by LINZ about the topic https://github.com/linz/elevation/tree/master/docs/tiff-compression 

Howard
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