Hi, I am struggling to find out how datum transformations work - specifically also under QGIS Server.
I have a .gsb file (CHENYX06a.gsb) for Swiss datum transformations. It is located under /usr/local/shar/proj/ where all the other .gsb files are. I also set the DEFAULT_DATUM_TRANSFORM variable variable in my fcgid.conf file: FcgidInitialEnv DEFAULT_DATUM_TRANSFORM "EPSG:21781/EPSG:2056/100001/-1;EPSG:2056/EPSG:21781/-1/100001" I checked the entries in the srs.db on the server in the table tbl_datum_transform which has an entry: wkt_geom coord_op_code epsg_nr source_crs_code target_crs_code coord_op_method_code p1 p2 p3 p4 p5 p6 p7 remarks scope preferred deprecated area_of_use_code NULL 100001 15486 4149 4150 9615 0 But how does QGIS know that it should use the CHENYX06a.gsb file as grid-shift file? Where exactly does it find this information? Thank you for shedding some light on this mystery. Andreas
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