[gdal-dev] Computing my overviews for GeoTIFF

[Javier Jimenez Shaw]

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.bonfort at 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.rouault at 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 at 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 at lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/gdal-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20210713/a3e52eec/attachment.html>