Le 21/05/2025 à 20:53, Abel Pau a écrit :
Okay, thanks!
So the interpretation we are aiming for is option *a)*:
Each band is treated independently, and each one has its own NODATA
value. The NODATA value of one band is unrelated to that of the others.
That said, the question is whether this behavior is consistently
supported across all formats, or if it only works this way in our
custom implementation.
GDAL core (and most algorithms) should work fine, but if you want to
convert to GeoTIFF or COG, they only support the same nodata value for
all bands (although we could potentially extend the GDAL_NODATA tag to
support one value per band, but that would be debate for another
thread), and the same band type for all bands.
If not, perhaps the more robust approach would be to separate bands
with different NODATA values into different subdatasets.
That's a possibility indeed. I'm not sure any implemented format has
done such effort, but there is nothing inherently wrong if you want to
do that.
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