Richard McDonnell via QGIS-User <qgis-user@lists.osgeo.org> writes: > It appears that, when you georeference an image which already contains > reference information it in effect applies a shift to the outputs. > One solution might be one of the options suggested > here<https://gis.stackexchange.com/questions/237314/removing-coordinate-system-but-not-coordinates-of-raster>. > The > one which looks best suited for Georeferencing data wich already has a > CRS applied, would appear to me to be.. > > gdal_translate -co PROFILE=BASELINE -co TFW=YES dem.tif dem_clean.tif > > It seems to reset the GeoTiff back to just a Tiff, from there you should be > able to georeference it easy enough.
It seems obviously buggy (but seriously nothing is entirely obvious as this is complicated) for the georeferencer to behave as it is. The UI seems to me to imply "figure it out and write it", and while it seems fair to use existing info as a starting point, the shift interpretation seems odd. Is there an open bug about this? If not, it would be great for Mark to file one using the particular details of his situation. I'm not really clear on if the bug is triggered with: CRS but not scale/offset CRS and with scale/offset no CRS and with scale/offset As far as I know the georeferencer works fine if both CRS and scale/offset are missing; that's the normal case. _______________________________________________ QGIS-User mailing list QGIS-User@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
