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
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