Jan Jezek a écrit :
> After digging EPSG database I've found strange behavior of math transform
> finding. When I have CRS where the transformation to WGS84 (4326) is defined
> as concatenated operation then I'm able to transform to 4326 properly, but I
> can't transform to other CRSs though they have definition for transformation
> to the 4326 (for example from 4818 to 4324). Or in deed - I can but with
> 'Bursa wolf parameters required' Exception. Isn’t that a bug?
Maybe it is not a matter of ConcatenatedTransform (but I'm not sure). I just
tried the following:
java org.geotools.referencing.CRS -colors -authority=EPSG 4818 4324
and got:
GEOGCS["S-JTSK (Ferro)",
DATUM["S-JTSK (Ferro)",
SPHEROID["Bessel 1841", 6377397.155, 299.1528128,
AUTHORITY["EPSG","7004"]],
AUTHORITY["EPSG","6818"]],
PRIMEM["Ferro", -17.666666666666668, AUTHORITY["EPSG","8909"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic latitude", NORTH],
AXIS["Geodetic longitude", EAST],
AUTHORITY["EPSG","4818"]]
???????????????????????????????????????????????????????????????????????????????
GEOGCS["WGS 72BE",
DATUM["WGS 72 Transit Broadcast Ephemeris",
SPHEROID["WGS 72", 6378135.0, 298.26, AUTHORITY["EPSG","7043"]],
TOWGS84[0.0, 0.0, 1.9, 0.0, 0.0, 0.814, -0.07838062637389662],
AUTHORITY["EPSG","6324"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic latitude", NORTH],
AXIS["Geodetic longitude", EAST],
AUTHORITY["EPSG","4324"]]
Its look like that ""S-JTSK (Ferro)" really don't have TOWGS84 parameters
defined in the EPSG database. Or maybe there is some but the epsg-hsql plugin
missed then. If you can find such parameter in the EPSG database or if you can
send us by email a transformation path that Geotools should have found, it
would
be a bug in the referencing module that I would try to fix.
In the main time, you can use the LENIENT_DATUM_SHIFT hint for getting
transformations even when the Bursa-Wolf parameters are missing.
Martin
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