Here's a working c version: https://gist.github.com/tbonfort/1e8630cf4b9bc82471c164e422c1cce7
On Tue, Jul 13, 2021 at 2:55 PM thomas bonfort <thomas.bonf...@gmail.com> wrote: > > https://www.mail-archive.com/gdal-dev@lists.osgeo.org/msg36305.html > :) > > On Tue, Jul 13, 2021 at 2:53 PM Javier Jimenez Shaw <j...@jimenezshaw.com> > wrote: > > > > 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 <thomas.bonf...@gmail.com> > > 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 <even.roua...@spatialys.com> > >> 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 > >> > gdal-dev@lists.osgeo.org > >> > 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 > >> > gdal-dev@lists.osgeo.org > >> > https://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
