[gdal-dev] Setting TIFFTAG_* in COG

[Javier Jimenez Shaw]

Thanks!

On Mon, 4 Dec 2023 at 16:46, Even Rouault <even.rouault at spatialys.com>
wrote:

> Javier,
>
> TIFFTAG_DATETIME or AREA_OR_POINT are copied by the COG/GTiff drivers from
> the source dataset metadata.
>
> So using gdal_translate / GDALTranslate(), you may set them with the "-mo
> KEY=VALUE" option.
>
> If using an intermediate VRT as the source for GDALCreateCopy(), then you
> may call SetMetadataItem("KEY", "VALUE") on the VRT. I don't see an option
> in GDALBuildVRT() to do that, but you can definitely open the VRT after it
> has been created and call SetMetadataItem() on it
>
> Even
> Le 04/12/2023 à 16:14, Javier Jimenez Shaw via gdal-dev a écrit :
>
> Hi
>
> I am trying to convert a "normal" tiff file into a COG. For that I am
> using an intermediate vrt file to add the geolocation parameters, and
> finally copy the vrt into a COG.
> I am doing it in C++, but it should be similar doing it on the command
> line I hope. (In some cases I am using also other parameters of the
> gdalbuildvrt).
>
> My problem is how are the "magic words" to set the TIFFTAG_* (like
> TIFFTAG_DATETIME) in the final COG. I guess I could use the option "-oo"
> for the options in GDALBuildVRT, or in the options of the method
> "CreateCopy" for COG driver.
> Is that doable that way? Should I prefix "TIFFTAG_..." with something like
> "GDALMETADATA:"? (I tried, unsuccessfully)
> Is that the same for AREA_OR_POINT?
>
> Thanks.
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