You have the wrong TOWGS84[601.705, 84.263, 485.227, 4.7354, -1.3145,
-5.393, -2.3887], in both of your CRS, the correct values are
TOWGS84[577.326,90.129,463.919,5.137,1.474,5.297,2.4232],
Cheers
On Tue, Dec 4, 2018 at 10:35 AM Clemens Eisserer <linuxhi...@gmail.com>
wrote:
> Hi,
>
> Being a complete newbie to geotools I would like to use geotools to
> transform a Point supplied in Gauss-Krueger (EPSG:31257) coordinate
> system to lambert (used by the database):
>
> CoordinateReferenceSystem gkCRS = CRS.decode("EPSG:31257");
> CoordinateReferenceSystem dbCRS =
> dataBaseFeatureType.getCoordinateReferenceSystem();
>
> GeometryBuilder geometryBuilder = new GeometryBuilder(gkCRS);
> org.opengis.geometry.primitive.Point point =
> geometryBuilder.createPoint(-46001.68, 5251934.86);
> org.opengis.geometry.primitive.Point transformedPoint =
> (org.opengis.geometry.primitive.Point) point.transform(dbCRS);
> Point trJTSPoint = JTS.toGeometry(transformedPoint.getDirectPosition());
>
> According to the test-data I got, the transformed point should be (
> 127778.84 395783.40 ) - however instead I get Point(400000.0
> 6251760.423548385).
>
> Any idea whats going wrong here?
>
> Thank you advance and best regards, Clemens
>
> gkCRS is:
> PROJCS["MGI / Austria GK M28",
> GEOGCS["MGI",
> DATUM["Militar-Geographische Institut",
> SPHEROID["Bessel 1841", 6377397.155, 299.1528128,
> AUTHORITY["EPSG","7004"]],
> TOWGS84[601.705, 84.263, 485.227, 4.7354, -1.3145, -5.393, -2.3887],
> AUTHORITY["EPSG","6312"]],
> PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
> UNIT["degree", 0.017453292519943295],
> AXIS["Geodetic longitude", EAST],
> AXIS["Geodetic latitude", NORTH],
> AUTHORITY["EPSG","4312"]],
> PROJECTION["Transverse_Mercator"],
> PARAMETER["central_meridian", 10.333333333333334],
> PARAMETER["latitude_of_origin", 0.0],
> PARAMETER["scale_factor", 1.0],
> PARAMETER["false_easting", 150000.0],
> PARAMETER["false_northing", -5000000.0],
> UNIT["m", 1.0],
> AXIS["Easting", EAST],
> AXIS["Northing", NORTH],
> AUTHORITY["EPSG","31257"]]
>
> while dbCRS is:
> PROJCS["MGI / Austria Lambert",
> GEOGCS["MGI",
> DATUM["Militar-Geographische Institut",
> SPHEROID["Bessel 1841", 6377397.155, 299.1528128,
> AUTHORITY["EPSG","7004"]],
> TOWGS84[601.705, 84.263, 485.227, 4.7354, -1.3145, -5.393, -2.3887],
> AUTHORITY["EPSG","6312"]],
> PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
> UNIT["degree", 0.017453292519943295],
> AXIS["Geodetic longitude", EAST],
> AXIS["Geodetic latitude", NORTH],
> AUTHORITY["EPSG","4312"]],
> PROJECTION["Lambert_Conformal_Conic_2SP"],
> PARAMETER["central_meridian", 13.333333333333334],
> PARAMETER["latitude_of_origin", 47.5],
> PARAMETER["standard_parallel_1", 49.0],
> PARAMETER["false_easting", 400000.0],
> PARAMETER["false_northing", 400000.0],
> PARAMETER["scale_factor", 1.0],
> PARAMETER["standard_parallel_2", 46.0],
> UNIT["m", 1.0],
> AXIS["Easting", EAST],
> AXIS["Northing", NORTH],
> AUTHORITY["EPSG","31287"]]
>
>
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>
--
DI Christian Mueller MSc (GIS), MSc (IT-Security)
OSS Open Source Solutions GmbH
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