Hi, Have you tried adding 'towgs84=0,0,0,0,0,0,0' also to RT90 definitions?
-Jukka Rahkonen- > -----Alkuperäinen viesti----- > Lähettäjä: mapserver-users-boun...@lists.osgeo.org > [mailto:mapserver-users-boun...@lists.osgeo.org] Puolesta Fia > Lähetetty: 22. tammikuuta 2010 10:56 > Vastaanottaja: mapserver-users@lists.osgeo.org > Aihe: [mapserver-users] Projection error, RT90 in MapServer > > > 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-tp4438 > 959p4438959.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 > _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
