The decode and find math transform methods are only utility class to avoid messing around with the factories directly. In this case with specific needs you may wish to mess around with the factories directly and get exactly the math transform you want.
You may be able to get exactly what you want using epsg_operations.properties also? -- Jody Garnett On Sun, 13 Jun 2021 at 04:16, Ian Turton <ijtur...@gmail.com> wrote: > I'm looking at how to pick out a specific transform for a coordinate > reference system (e.g. https://epsg.io/21036) EPSG:21036 has 4 transforms > defined in the EPSG database and currently GeoTools picks the Kenyan > onshore one (https://epsg.io/21036-1284) presumably because it has the > best accuracy. Now I happen to be looking at data in Tanzania so I would > prefer to pick that transform (https://epsg.io/21036-1285) - so far as I > can see the only way to do this is to use the WKT and define a new CRS > object from that which is OK but a bit fiddly. > > I would prefer to be able to say something like: > > CoordinateReferenceSystem arc1960SRS = CRS.decode("EPSG:21036-1285"); > > From the look of the code it would involve modifying > org.geotools.referencing.operation.DefaultCoordinateOperationFactory.createOperation(CoordinateReferenceSystem, > CoordinateReferenceSystem) to check for the preferred transform rather than > returning the first one it finds in the database. So would probably need to > make sure that CRS decode found the correct transform and made a note of > that transform for later. > > Or am I missing an easier way of doing this and the documentation needs > updating? > > Ian > > -- > Ian Turton > _______________________________________________ > GeoTools-Devel mailing list > GeoTools-Devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-devel >
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