To answer my own question I believe the answer is that you need to create an alpha band when working with RGB datasets to have JPEG compressed COGs without compression artifacts in the nodata areas. Creating a internal mask on the source data may work as well but I haven't tried.
# add a alpha band using the nearblack utility nearblack -setalpha rgb_nodata.tif -o rgba.tif # create the COG gdal_translate -of COG -co COMPRESS=JPEG -co TILING_SCHEME=GoogleMapsCompatible -co NUM_THREADS=ALL_CPUS -co BIGTIFF=YES rgba.tif cog.tif Regards On Tue, 19 Jul 2022 at 15:19, Travis Kirstine <traviskirst...@gmail.com> wrote: > I've been trying to create a COG with JPEG compression with transparent > nodata values without much success. Is this possible without creating a > secondary mask? > > Any hints? > > Regards >
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