[Geotools-gt2-users] CRS transformation not accurate

[Loïc MAZE]

Dear list, I currently work with the EPSG database in order to make some CRS transformations. My primary goal is to transform a CRS expressed into WGS84 to a CRS in Lambert II étendu. I use the EPSG:4326 code for the WGS84 and the EPSG:27572 for the Lambert II.   Everything works but the result isn't accurate. For example, I have a point at longitude 5.08° east and at latitude 47.31° north (in WGS84). The result of the transformation is a point with the following coords : X = 807332 meters and Y = 2260657 meters.   The correct point will have those coords : X = 807389 meters and Y = 2260315 meters.     My code is straithforward :   CoordinateReferenceSystem sourceCRS = CRS.decode("EPSG:4326"); CoordinateReferenceSystem targetCRS = CRS.decode("EPSG:27572");   CoordinateOperationFactory opFactory = FactoryFinder.getCoordinateOperationFactory(new Hints(Hints.LENIENT_DATUM_SHIFT, Boolean.TRUE)); CoordinateOperation operation = opFactory.createOperation(sourceCRS, targetCRS); MathTransform Transfo = (MathTransform) operation.getMathTransform();   DirectPosition SourcePoint = new GeneralDirectPosition(Latitude, Longitude); DirectPosition TargetPoint = Transfo.transform(SourcePoint, null);     Is it an error in my code, in he EPSG database, or in the projection library ? Has someone an idea ? Any help will be greatly appreciated.   Kind regards, Loïc