Hello, I have a problem showing data in the former Swedish standard reference system RT90 2,5 gon V. The point is projected ~250 meters northwest of where it should be. I have used the projection parameters for MapServer from Spatialreference.org.
The underlying map projection is SWEREF 99 TM (the new standard Swedish reference system), with the following projection parameters: PROJECTION 'proj=utm' 'zone=33' 'ellps=GRS80' 'towgs84=0,0,0,0,0,0,0' 'units=m' 'no_defs' END I have then tested to pinpoint an intersection, in both WGS-84 and RT90, but the RT90 point does not end up where it should be. I have double checked that the RT90 coordinates are correct by transforming them to WGS-84. See my attached screenshot. http://n2.nabble.com/file/n4438959/rt90_mapserver_error.jpg For the WGS-84 point I have the following projection parameters: PROJECTION 'proj=longlat' 'ellps=WGS84' 'datum=WGS84' 'no_defs' 'units=m' END And the RT90 point has: PROJECTION "proj=tmerc" "lat_0=0" "lon_0=15.80827777777778" "k=1" "x_0=1500000" "y_0=0" "ellps=bessel" "units=m" "no_defs" END I have also tried all the other RT90 projections provided by Spatialreference.org, just to see if any of them would work better, but without luck. Have I made a mistake somewhere, or are there any suggestions of why this error occurs? I'm out of ideas. Regards, Sofia -- View this message in context: http://n2.nabble.com/Projection-error-RT90-in-MapServer-tp4438959p4438959.html Sent from the Mapserver - User mailing list archive at Nabble.com. _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users