Selon David Strip <[email protected]>: > The GDAL API tutorial describes this array as: > > adfGeoTransform[0]/* top left x */ > adfGeoTransform[1]/* w-e pixel resolution */ > adfGeoTransform[2]/* rotation, 0 if image is "north up" */ > adfGeoTransform[3]/* top left y */ > adfGeoTransform[4]/* rotation, 0 if image is "north up" */ > adfGeoTransform[5]/* n-s pixel resolution */ > > The GDAL Data model page says > Xgeo = GT(0) + Xpixel*GT(1) + Yline*GT(2) > Ygeo = GT(3) + Xpixel*GT(4) + Yline*GT(5) > where the GT[i]are the coeffs described above. > > From this I conclude that the rotations are not sin/cos of the rotation, but > rather the sin/cos times the > appropriate pixel size. Is that right, or did I miss something?
Yes, for a pure rotation. If the [1], [2], [4] and [5] have no particular relation, the matrix can represent a combination of scaling, rotation and shearing. See http://en.wikipedia.org/wiki/Transformation_matrix > > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
