[mapguide-users] Re: Problems with coordinate systems

[Anders]

Hi Andreas,

It depends on what local coordinate system you are using. I guess you are
working with swedish coordinate systems (?), in that case you might need to
do a coordinate system override on your data sources. For example, for RT90
2,5 gon V you set WKT as:

PROJCS["RT90_2.5V_SWEREF99/01",GEOGCS["SWEREF99.LL",DATUM["SWEREF99",SPHEROID["GRS1980",6378137.000,298.25722210],TOWGS84[0.0000,0.0000,0.0000,0.000000,0.000000,0.000000,0.00000000]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse
Mercator using Kruger
Formulation"],PARAMETER["false_easting",1500064.274],PARAMETER["false_northing",-667.711],PARAMETER["scale_factor",1.000005610240],PARAMETER["central_meridian",15.80628452944440],PARAMETER["latitude_of_origin",0.00000000000000],UNIT["Meter",1.00000000000000]]

For SWEREF you should not need to make a coordinate system override on your
feature sources.

Also make sure that your map definition is using below WKT:

PROJCS["Popular Visualisation CRS / Mercator",GEOGCS["Popular Visualisation
CRS",DATUM["Popular_Visualisation_Datum",SPHEROID["Popular Visualisation
Sphere",6378137,0,AUTHORITY["EPSG","7059"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6055"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4055"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],AUTHORITY["EPSG","3785"],AXIS["X",EAST],AXIS["Y",NORTH]]

There are more information about commercial overlays on 
http://trac.osgeo.org/fusion/wiki/MapGuideCommercialOverlays this URL 


Best Regards
Anders

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