Hi all,
I have an urgent problem. I need to get the transformation from WGS84
coordination comming from a GPS reciever working. I'm doing the following
right now:
1. Step:
Get the target CS via
------------------------------------------------------
String wkt = "PROJCS[\"GK_Zone_3N\", "
+ "GEOGCS[\"DE_DHDN\", "
+ "DATUM[\"DE_DHDN\", "
+ "SPHEROID[\"Bessel 1841\", 6377397.155, 299.15281285,
AUTHORITY[\"EPSG\",\"31467\"]], "
+ "TOWGS84[-231.89,101.34,27.23,-0.61,0.17,-0.93,1.84],
AUTHORITY[\"EPSG\",\"6326\"]], "
+ "PRIMEM[\"Greenwich\", 0.0], "
+ "UNIT[\"degree\",0.017453292519943295], "
+ "AXIS[\"Longitude\",EAST], "
+ "AXIS[\"Latitude\",NORTH]], "
+ "PROJECTION[\"Transverse_Mercator\"], "
+ "PARAMETER[\"semi_major\", 6377397.1550], "
+ "PARAMETER[\"semi_minor\", 6356078.9633], "
+ "PARAMETER[\"central_meridian\", 9], "
+ "PARAMETER[\"latitude_of_origin\", 0.0], "
+ "PARAMETER[\"scale_factor\", 1.0], "
+ "PARAMETER[\"false_easting\", 4300000.0], "
+ "PARAMETER[\"false_northing\", 0.0], "
+ "UNIT[\"metre\",1.0], "
+ "AXIS[\"x\",EAST], "
+ "AXIS[\"y\",NORTH]]";
CoordinateSystemFactory csFactory = CoordinateSystemFactory.getDefault();
CoordinateSystem targetCS = csFactory.createFromWKT(wkt);
------------------------------------------------------
2. Step:
Get the source CS via
------------------------------------------------------
CoordinateSystem sourceCS = GeographicCoordinateSystem.WGS84;
------------------------------------------------------
3. Step:
Get the MathTransformation
------------------------------------------------------
CoordinateTransformationFactory trFactory =
CoordinateTransformationFactory.getDefault();
CoordinateTransformation tr = trFactory.createFromCoordinateSystems(sourceCS,
targetCS);
------------------------------------------------------
4. Step:
Do the transformation:
------------------------------------------------------
MathTransform transform1 = tr.getMathTransform();
point2 = transform1.transform(point1, point2);
------------------------------------------------------
But the resulting coordinates differ from the ones that should result.
Can anyone of you tell me if there is a problem the way I'm thinking or is it
a bug within geotools?
--
With kind regards
Michael Duergner
Student
Department of Computer Science (http://www.ifi.lmu.de)
Ludwig-Maximilians University Munich
Center for Digital Technology and Management (http://www.cdtm.de)
Ludwig-Maximilians University and Technical University Munich
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