Moritz Lennert > Thanks to everyone for their answers. I've tried all the > different suggestions and the answer seems to be clear: > on-the-fly projection does not work properly in QGIS and gvSIG... > Whatever I do in GRASS, I always get correct placement of the GPS data.
This seems to be QGIS bug # 1079 http://trac.osgeo.org/qgis/ticket/1079 (usual suspects reporting in :) > Using on-the-fly projection in the other programs, I get a > difference of about 100m, so I guess it's a datum issue as > Hamish suggests. It would seem so. I can reproduce it here (see bug report). In my case looking in the layer's "P"roperies projection tab I see the the +datum= and/or +towgs84= terms are missing* versus what is found in the EPSG file. [*] file: /usr/share/qgis/resources/srs.db (SQLite DB) Root cause seems to be that QGIS lacks a "pick appropriate datum transform parameters to use" GUI in the case when there are multiple possibilities, and so it doesn't try any datum transform at all: http://www.nabble.com/why-is-EPSG%3A2180-not-recognised--td16505409.html#a16592790 Hamish _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
