On jeudi 17 septembre 2020 20:26:59 CEST Sebastiaan Couwenberg wrote: > On 9/17/20 7:56 PM, Antonio Valentino wrote: > > today I tried to made some tests to generate Cloud Optimized Geotiff > > (COG) files with LERC compression. > > > > I realized that this is not possible in debian because, if I understand > > correctly, we build GDAL using system libtiff while the LERC compressor, > > according to [1], need the internal libtiff. > > Yes, and that's somewhat broken by design. > > libtiff should expose the features required by GDAL for this. IIRC GDAL > uses a private header currently.
One potential one way forward would be that Debian provides a libtiff-private-dev package (similarly to libpoppler-private-dev) with the "tiffiop.h" header, and then GDAL build logic could be modified to use it. At least that's the theory. I haven't tried (TM) > > The strange thing, to me, is that the same limitation also applies to > > the the ZSTD compressor [1], but in this case I'm perfectly able to > > generate COG files with ZSTD compression in debian. That isn't the same situation. The ZSTD codec is in official libtiff, so I assume Debian libtiff is built with ZSTD support, hence you get in GDAL. Even -- Spatialys - Geospatial professional services http://www.spatialys.com
