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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