[gdal-dev] Gdaladdo and external mask band

[Even Rouault]

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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