[gdal-dev] Computing my overviews for GeoTIFF

[Even Rouault]

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.
> .___ ._ ..._ .. . ._. .___ .. __ . _. . __..  ... .... ._ .__
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>
>
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