Merci Martin!
I saw that there was that method on CoordinateOperationAuthorityFactory but
didn't see any way to get an object that implemented that interface. So I can
now write something like:
CoordinateReferenceSystem wgs84 = CommonCRS.WGS84.geographic();
CoordinateReferenceSystem nad27 = CommonCRS.NAD27.geographic();
ProjectedCRS projCrs = (ProjectedCRS)
CRS.forCode("EPSG:32040"); // NAD27 / Texas South Central
GeographicCRS geoCrs = projCrs.getBaseCRS();
CoordinateOperation conversion = CRS.findOperation(projCrs,
geoCrs, null);
CoordinateOperationAuthorityFactory opFactory =
(CoordinateOperationAuthorityFactory) CRS.getAuthorityFactory("EPSG");
CoordinateOperation transform =
opFactory.createCoordinateOperation("15851"); //NADCON grid based transform
DirectPosition ptSrc = new DirectPosition2D(300000, 5200000);
DirectPosition ptNad27 =
conversion.getMathTransform().transform(ptSrc, null);
DirectPosition ptWgs84 =
transform.getMathTransform().transform(ptNad27, null);
This works just fine but I wonder whether there is more efficient way to do
this ? May I chain the conversion and transform operations together into one
operation in order to convert my NAD27 based projection CRS to WGS84 in one
step?
Clay
