Hi, I'm trying to understand why GDALApplyGeoTransform behaves as it does. I would think that when you use it to transform a raster coordinate to a geo coordinate, it would apply what is known about the raster and the transformation to get the correct location. What I see happening is some drivers is an adjustment to "center" the points in the middle of a raster cell. This is fine, but I don't understand why GDALApplyGeoTransform doesn't do this if this is always the proper operation. The GeoTiff spec (see 2.5.2.2) says that this behavior is the default unless the key GTRasterTypeGeoKey is set to RasterPixelIsPoint.
Then I found this: https://trac.osgeo.org/gdal/wiki/rfc33_gtiff_pixelispoint which was supposed to address this issue, but I'm not sure it was implemented or how. Anyway, I'm not sure what's supposed to happen and I'm not sure why I should have to manually adjust a pixel's position when converted to a geolocation rather than expect the correct value to be generated by GDALApplyGeoTransform. Of course, I may well be missing something, so please correct me if I am. Thanks, -- Andrew Bell andrew.bell...@gmail.com _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
