Julien, I am not aware of any existing way to do this. I might be nice if an OGR VRT could apply something like this on the fly, but that doesn't exist currently.
Best regards, Frank On Fri, May 24, 2013 at 3:04 AM, Julien Malik <julien.ma...@c-s.fr> wrote: > Hello, > > Is it possible to apply an on-the-fly affine transform to an OGR dataset > with the help of VRT ? > Could not find any help or mailing list message about this... > > The source of the issue is we want to display in QGIS a non-georeferenced > raster with an associated GML mask, where the coordinates in the mask are > in pixel indices, relative to the raster (X and Y coordinates are unsigned > integers). > When loading those two layers as-is in QGis, the raster is correctly > displayed (north up, south down) but the GML mask is inverted, with a > symmetry around the Y axis (Y coordinates interpreted as south->north when > Y increases). We would like the GML mask to be overlayed on the raster, so > applying "f(Y)=-Y" on the coordinates would do the trick. > Any other idea to cope with this issue would be appreciated. We asked on > qgis-users and still no luck. > > Thanks in advance, > Julien > > > ______________________________**_________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/**mailman/listinfo/gdal-dev<http://lists.osgeo.org/mailman/listinfo/gdal-dev> > -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Software Developer
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