Does not look horrible; what is all the parametervaluegroup stuff for?
Are you defining the UTM coordinate reference system yourself?
Two alternatives for defining the UTM:
- There are lots of UTMs defined already the the EPSG dataset;
- You could represent the UTM information as WKT and parse it
And a suggestion; make sure the incoming positionUTM is constructued
with the correct coordinate reference system; that
way you can just call the translate method with
DefaultGeographicCRS.WGS84 and get on with your life.
Jody
> Hi:
>
> Is this the right way to do UTM -> Long/Lat conversion?
>
> -- CODE START
> public DirectPosition UTMtoLatLong(DirectPosition positionUTM) {
> DirectPosition positionLatLong = null;
>
> GeographicCRS geoCRS = DefaultGeographicCRS.WGS84;
> CartesianCS cartCS = DefaultCartesianCS.GENERIC_2D;
>
> MathTransformFactory mtFactory =
> FactoryFinder.getMathTransformFactory(null);
> FactoryGroup factories = new FactoryGroup(null);
>
> try {
> ParameterValueGroup parameters =
> mtFactory.getDefaultParameters("Mercator_1SP");
> parameters.parameter("scale_factor").setValue(0.9996);
> //parameters.parameter("scale_factor").setValue(1.000);
> //parameters.parameter("central_meridian").setValue(0.0);
> //parameters.parameter("latitude_of_origin").setValue(0.0);
> parameters.parameter("false_easting").setValue(500000.0);
> //parameters.parameter("false_northing").setValue(0.0);
>
> Map properties = Collections.singletonMap("name", "WGS 84 /
> Mercator_1SP");
> ProjectedCRS projCRS = factories.createProjectedCRS(properties,
> geoCRS, null, parameters, cartCS);
>
> CoordinateOperationFactory coFactory =
> FactoryFinder.getCoordinateOperationFactory(null);
>
> CoordinateReferenceSystem sourceCRS = geoCRS;
> CoordinateReferenceSystem targetCRS = projCRS;
> CoordinateOperation op = coFactory.createOperation(sourceCRS,
> targetCRS);
> MathTransform mtLatLong2UTM = op.getMathTransform();
> //System.out.println("Math Transform: " + mtLatLong2UTM.toWKT());
>
> MathTransform mtUTM2LatLong = mtLatLong2UTM.inverse();
>
> positionLatLong = mtUTM2LatLong.transform(positionUTM, null);
> } catch (Exception ex) {
> System.err.println(ex.getMessage());
> }
>
> return positionLatLong;
> }
> -- CODE END
>
>
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