On Tue, Aug 6, 2013 at 2:21 AM, Jan Hartmann <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 > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev