[gdal-dev] OGR VRT - affine transform ?

[Frank Warmerdam]

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.malik at 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
>
>
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