Heng, > > > http://osgeo-org.1803224.n2.nabble.com/file/n5848200/gdalwarp_ > problem1.doc > gdalwarp_problem1.doc > Hi Uwe, > > I have tried your suggestion on the same raster file with a modified > "+x_0=500000" parameter in the command line (as seen in the > attached doc). I > could see the major difference:there is still one error > message left. When I > tried on another raster file with the same modified > parameter, I have got > much less error messages than before. However, is it still > possible that my > raster data are outside the area of the grid shift file? All > the raster data > I was trying to transform are GK (DHDN) zone 4, which false > easting value is > 4500000. This was why I used "+x_0=4500000" instead of > "+x_0=500000" in the > command line. As I am getting to know all these georeference > settings at the > moment, can you tell me why you suggested the modified > parameter and what > you meant about "raster data lacks the Gauss-Krueger meridian prefix"? > that was just a guess, because your coordinates lie far in the west of DHDN/GK zone 4. Normally DHDN/GK coordinates are noted as e.g.: 4500000.0 Rechts 5500000.0 Hoch
Omitting the Gauss-Krueger meridian prefix you have: 500000.0 Rechts 5500000.0 Hoch (Note: Rechts coordinate has only six digits) an thats far in the west of the real position. It's very simple and therefore you may give it a try. If it's not the case, may be you can post the output of: gdalinfo l0.tif That would help to see, if the file is correctly georeferenced. Regards Uwe _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
