Hi there,
I'm trying to transform a WGS84-coordinate into a Lambert-coordinate
("LCC_Europe"?!) using GeoTools2.
The WGS84-coordinate originates from the OpenGeoDB
(http://sourceforge.net/projects/opengeodb/) which covers the coordinates of
German locations.
For example:
Latitude 50.7333 - Longitude 7.1 (WGS84)
... should be (approximately) ...
x 280982 - y 189630 (LCC)
I already studied the GeoTools-API and checked the referencing-demo
("TransformationConsole")... but without success.
I'm no GIS-expert ... so I guess I'm missing some fundamental
functions/principles.
I tried my luck with this code:
try
{
// the default coordinate-systems ...
DefaultGeographicCRS geographicCRS = DefaultGeographicCRS.WGS84;
DefaultCartesianCS cartesianCS = DefaultCartesianCS.GENERIC_2D;
// the factories ...
DefaultMathTransformFactory mathTransformFactory = new
DefaultMathTransformFactory();
FactoryGroup factoryGroup = FactoryGroup.createInstance(null);
CoordinateOperationFactory coordinateOperationFactory =
FactoryFinder.getCoordinateOperationFactory(null);
// prepare the transformation ...
ParameterValueGroup lambertParameters =
mathTransformFactory.getDefaultParameters("Lambert_Conformal_Conic_1SP");
DefiningConversion conversion = new
DefiningConversion("LambertConversion", lambertParameters);
Map<String, Object> props = new HashMap<String, Object>();
props.put(IdentifiedObject.NAME_KEY, "projected crs name");
ProjectedCRS projectedCRS =
factoryGroup.createProjectedCRS(props, geographicCRS, conversion,
cartesianCS);
CoordinateOperation coordinateOperation =
coordinateOperationFactory.createOperation(geographicCRS, projectedCRS);
MathTransform forward = coordinateOperation.getMathTransform();
MathTransform inverse = forward.inverse();
// the longitude and latitude values obtained from opengeodb
double[] longitudeAndLatitude = new double[] { 50.7, 7.1 };
// the converted lcc-coordinates
double[] xAndY = new double[2];
// transform ...
forward.transform(longitudeAndLatitude, 0, xAndY, 0, -1);
System.out.println("xAndY: " + Arrays.toString(xAndY));
inverse.transform(xAndY, 0, longitudeAndLatitude, 0, -1);
System.out.println("longitudeAndLatitude: " +
Arrays.toString(longitudeAndLatitude));
}
catch (Throwable t)
{
Logger.getLogger(TransformationExample.class.getName()).log(Level.INFO,
"Caught exception: ", t);
}
But it leads to the following exception:
org.opengis.referencing.FactoryException: Latitudes 0°00.0'N and
0°00.0'N are opposite.
I probably forgot to set some additional parameters?!
Could anybody help me out with this?
Any hints or even a working code-snipplet would really be much appreciated.
Thanks in advance!
Best regards,
Achim
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