Le jeudi 04 juillet 2013 18:12:32, Jan Hartmann a écrit : > I'm struggling with the order of the Geotransform section in a vrt file. > I would like to rotate an image, and computed the six parameters for the > affine transformation. I can transform points exactly, using the > following formula: > > x2 = a.x1 + b.y1 + c > y2 = d.x1 + e.y1 + f > > Can anyone tell me what the order is in the GeoTransform section of the > VRT-file? > > <GeoTransform> c a b f d e </GeoTransform> > > results in an image somewhere in the neighbourhood, but mirrored and > translated. What is the order of the parameters a-f?
That looks correct, assuming that (x1, y1) is expressed as column, row in pixels of the image and (x2, y2) is expressed in the output coordinate system. > > Jan > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Geospatial professional services http://even.rouault.free.fr/services.html _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
