CRS.findOperation WGS84 to EPSG:20249 without using the EPSG geodetic dataset

Thu, 13 Jul 2017 05:45:21 -0700 

Hi,
is it possible to transform a WGS84 coordinate to EPSG:20249 without using the 
EPSG geodetic dataset?

I tried to find a CoordinateOperation based on EPSG:20249’s WKT 1.0 definition 
which includes the toWGS84 parameters, but I got the following exception:

org.opengis.referencing.operation.OperationNotFoundException: Coordinate 
conversion of transformation from system “ellipsoidal” to “Cartesian” has not 
been found.
                at 
org.apache.sis.referencing.operation.transform.CoordinateSystemTransform.create(CoordinateSystemTransform.java:212)
                at 
org.apache.sis.referencing.operation.transform.DefaultMathTransformFactory.createCoordinateSystemChange(DefaultMathTransformFactory.java:1235)
                at 
org.apache.sis.referencing.operation.CoordinateOperationFinder.createOperationStep(CoordinateOperationFinder.java:499)
                at 
org.apache.sis.referencing.operation.CoordinateOperationFinder.createOperation(CoordinateOperationFinder.java:269)
                at 
org.apache.sis.referencing.operation.CoordinateOperationFinder.createOperationStep(CoordinateOperationFinder.java:329)
                at 
org.apache.sis.referencing.operation.CoordinateOperationFinder.createOperation(CoordinateOperationFinder.java:258)
                at 
org.apache.sis.referencing.operation.DefaultCoordinateOperationFactory.createOperation(DefaultCoordinateOperationFactory.java:731)
                at org.apache.sis.referencing.CRS.findOperation(CRS.java:310)
                at crssample.Wkt1Test.epsg20249(Wkt1Test.java:31)
….
Caused by: java.lang.IllegalArgumentException: Incompatible coordinate system 
types.
                at 
org.apache.sis.referencing.cs.CoordinateSystems.swapAndScaleAxes(CoordinateSystems.java:290)
                at 
org.apache.sis.referencing.operation.transform.CoordinateSystemTransform.create(CoordinateSystemTransform.java:191)
                ... 31 more


My sample code is the following:
CoordinateReferenceSystem fromWkt = CRS.fromWKT(
                           "PROJCS[\"AGD66 / AMG zone 
49\",GEOGCS[\"AGD66\",DATUM[\"Australian_Geodetic_Datum_1966\",SPHEROID[\"Australian
 National 
Spheroid\",6378160,298.25,AUTHORITY[\"EPSG\",\"7003\"]],TOWGS84[-117.808,-51.536,137.784,0.303,0.446,0.234,-0.29],AUTHORITY[\"EPSG\",\"6202\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4202\"]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"latitude_of_origin\",0],PARAMETER[\"central_meridian\",111],PARAMETER[\"scale_factor\",0.9996],PARAMETER[\"false_easting\",500000],PARAMETER[\"false_northing\",10000000],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"Easting\",EAST],AXIS[\"Northing\",NORTH],AUTHORITY[\"EPSG\",\"20249\"]]");

             CoordinateOperation coordinateOperation = 
CRS.findOperation(CommonCRS.WGS84.geographic(), fromWkt, null);

             DirectPosition2D wgs84Position = new DirectPosition2D(-37.84, 
114.0);
             DirectPosition epsg20249Position = 
coordinateOperation.getMathTransform().transform(wgs84Position, null);

             Assert.assertArrayEquals(new double[] { 763850.6420409812, 
5807560.942144813 }, epsg20249Position.getCoordinate(), 1e-3f);

Thanks in advance!

Best Regards,
Steve



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