[gdal-dev] RAT for VRT

[Markus Müller]

Dear listers,

I need support for Raster Attribute Tables (RAT) when using the GDAL virtual format (VRT). It seems that the current VRT driver does not support RATs. I would like to know if:
- I am correct on the above assumption?
- If I am, are there any plans to extend the VRT driver to support RATs?
- other people have the same problem and are interested in solving it.


I am aware that RAT support for VRT poses some challenges as VRT files only reference other files and don't include data itself. A virtual RAT is only easy to implement if all referenced tiles use the same RAT. In case the RATs were different, i.e. reduced to the rows that are needed for a specific tile, then a virtual RAT would have to be created out of all referenced RATs or (somehow like a cache) the virtual RAT would have to be created at the time of the creation of the VRT file and then stored alongside it.


Comments, feedbacks etc very much appreciated.




Cheers,


Markus



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