Re: [gdal-dev] Gdaladdo and external mask band

2024-04-03 Thread Rahkonen Jukka via gdal-dev 
Hi,

Great, I just found 21000 .msk files without overviews from my computer. My 
scanned map files are so small that I have not noticed that they are 
unnecessary slow to view. Only trying someone else's data with 7 by 8 
pixels draw my attention.

-Jukka-

Lähettäjä: Even Rouault 
Lähetetty: keskiviikko 3. huhtikuuta 2024 17.18
Vastaanottaja: Rahkonen Jukka ; 
'gdal-dev@lists.osgeo.org' (gdal-dev@lists.osgeo.org) 
Aihe: Re: [gdal-dev] Gdaladdo and external mask band


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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Re: [gdal-dev] Gdaladdo and external mask band

2024-04-03 Thread Even Rouault via gdal-dev 

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) 
, 
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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[gdal-dev] Gdaladdo and external mask band

2024-04-03 Thread Rahkonen Jukka via gdal-dev 
Hi,

I was making some tests with filegdb raster from Region 5 - State 
(usda.gov),
 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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