Javier,
You can use the "NONE" resampling method in BuildOverviews() or gdaladdo
to create the overviews IFD without allocating any storage, and then you
can open the file in update mode to set whatever values you want.
APPEND_SUBDATASET=YES will not set the appropriate value for the
SubFileType TIFF tag, and thus such pages won't be recognized as overviews
Even
Le 13/07/2021 à 13:57, Javier Jimenez Shaw a écrit :
Hi
I am computing the overviews of a GeoTIFF on my own (using the GPU,
much faster), and I want to include them in the tif file (also in the
ovr sidecar file).
What is the best way to do it? Just creating a multipage TIFF (I guess
with the option APPEND_SUBDATASET=YES)? Is there anything else needed
(metadata, tiff tags, etc)?
So far I want to do it in RGBA 8 bit images. (In the future I want to
do it also in float32 images with nodata value and any number of
bands, but no hurry).
I am using GDAL 3.3.1
Any help is welcome.
Thanks.
Javier.
.___ ._ ..._ .. . ._. .___ .. __ . _. . __.. ... .... ._ .__
Entre dos pensamientos racionales
hay infinitos pensamientos irracionales.
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