[gdal-dev] Passing RAT between drivers, including VRT

[Ivan Lucena]

Hi folks,

I might be wrong, but it looks like the VRT driver is not supporting RAT at this moment (TRUNK).

Is that correct? 

A simple way to test it is by "gdal_translating" that file "i8u_c_i.img" from autotest to VRT:

$ gdal_translate -of vrt i8u_c_i.img vrt_i8u_c_i.vrt
$ gdalinfo vrt_i8u_c_i.vrt -noct

The RAT is not there.

That wouldn't be a big problem by itself, the real problem is that gdal_translate uses an internal VRT to support several options. And I am trying to fix that ticket: http://trac.osgeo.org/gdal/ticket/5200 and I noticed that when I use *-a_nodata* the GetDefaultRAT() it returns null.

Drivers that implement *file based* GDALPamDataset doesn't seems to have that problem because they don't need to call GetDefaultRAT(). Examples:

$ gdal_translate -of gtiif i8u_c_i.img gtiff_i8u_c_i.tif -a_nodata 0
$ gdal_translate -of gtiif i8u_c_i.img gtiff_i8u_c_i.tif

The RAT is transferred to the geotiff file in both instances.

Is that something we would like to get fix in VRT?

Best regards,

Ivan





 		 	   		  
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