Thanks Eli, but this is not what I am trying to do. I have to create
hundreds of VRTs, all the same except for the one <geotransform> line. I
would like to to this without making physical copies of the whole file,
but with some sort of symbolic link to a central VRT-file, and just add
the geotransform information for each individual file. Perhaps it isn't
possible; in that case I'll hard-copy the whole bunch.
Jan
On 6-8-2013 18:18, Eli Adam wrote:
On Tue, Aug 6, 2013 at 2:21 AM, Jan Hartmann <j.l.h.hartm...@uva.nl
<mailto:j.l.h.hartm...@uva.nl>> wrote:
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.
I'm not sure if this will work for what you are doing, but I change
the projection of VRT files with gdalwarp: gdalwarp -of VRT -t_srs
"+proj=omerc +lat_0=44.75 +lonc=-124.05 +alpha=5 +k=1
+x_0=134743.33241 +y_0=369139.02771 +ellps=GRS80 +datum=NAD83
+to_meter=0.3048 +no_defs +wktext" infile.vrt outfile.vrt
Eli
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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