Thanks Thomas and Even. Thomas, about using cogger (that would be great), I forgot to mention that I am doing it from a C++ library. Is there already a C/C++ API?
Cheers, Javier .___ ._ ..._ .. . ._. .___ .. __ . _. . __.. ... .... ._ .__ Entre dos pensamientos racionales hay infinitos pensamientos irracionales. On Tue, 13 Jul 2021 at 14:15, thomas bonfort <[email protected]> wrote: > Javier, > You can use https://github.com/airbusgeo/cogger#advanced to do that, > provided that you have an internally tiled geotiff. > > -- > thomas > > On Tue, Jul 13, 2021 at 2:04 PM Even Rouault <[email protected]> > wrote: > > > > 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. > > > > > > _______________________________________________ > > gdal-dev mailing list > > [email protected] > > https://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > -- > > http://www.spatialys.com > > My software is free, but my time generally not. > > > > _______________________________________________ > > gdal-dev mailing list > > [email protected] > > https://lists.osgeo.org/mailman/listinfo/gdal-dev >
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