Hi Jukka,
I've realized this behaviour was actually documented in
https://gdal.org/drivers/raster/gtiff.html#overviews-and-nodata-masks :
"Internal overviews, external nodata mask: when running BuildOverviews()
in update mode on the .tif file, only the overviews of the main bands
will be generated. Overviews of the external .msk file must be
explicitly generated by running BuildOverviews() on the .msk."
... but just after fixing it in https://github.com/OSGeo/gdal/pull/9603
to do the expected thing: that is build overviews of the main bands and
of the .msk
I think it is also high time to reconsider switching the default value
of GDAL_TIFF_INTERNAL_MASK to YES : https://github.com/OSGeo/gdal/pull/9604
Even
Le 03/04/2024 à 10:56, Rahkonen Jukka via gdal-dev a écrit :
Hi,
I was making some tests with filegdb raster from Region 5 - State
(usda.gov)
<https://www.fs.usda.gov/detail/r5/communityforests/?cid=fseprd1009698>,
file
https://usfs-public.box.com/shared/static/q96eev9gnsa9hw5bwpmwpmxerbdat0vi.zip
I converted the data into GeoTIFF, added overviews, and noticed, that
the GeoTIFF is very slow to browse with QGIS at small scales. I
noticed that it is because gdal_translate creates an external .msk
mask band, and gdaladdo does not create overviews for the mask.
Is is somehow possible to create overviews for the .msk mask either
automatically or manually? Or would it create a bad mask that would
not match with the corresponding overviews of the data bands?
-Jukka Rahkonen-
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