Not sure if this is possible, but perhaps someone here knows a trick.
I use a VRT file as an index to a large set of detailed, tiled scans of the Netherlands, built with gdalbuildvrt. I recently discovered how to transform this map on the fly, so that it exactly aligns to older maps in different coordinate systems. It's just a matter of adapting the <geotransform> item in the VRT file.
So I can copy the VRT file for every old map, and adapt the <geotransform> in each of them. This means that all VRT files will be identical, except for the <geotransform> line. The VRT files are quite large, because they cover lots of tiles. Can anyone here think of a method to do this with one central VRT file, in which only the <geotransform> line is plugged that is required for the particular old map? Something like a symbolic link to concatenate the variable and stable parts of the VRT file?
Jan
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