CoordinateOperationFactory should query AuthorityBackedFactory for
transformation steps
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Key: GEOT-852
URL: http://jira.codehaus.org/browse/GEOT-852
Project: GeoTools
Type: Improvement
Components: referencing
Versions: 2.3.M0, 2.2-RC2
Reporter: Martin Desruisseaux
Assigned to: Martin Desruisseaux
Priority: Minor
Fix For: 2.3.M0
The coordinate operation factory query the authority database (usually EPSG)
only for the requested operation as a whole. For example the following
transformation:
27572 ("NTF (Paris) / Lambert zone II") --> 4326 ("WGS 84")
is really implemented (both in Geotools and in EPSG spirit) as
27572 ("NTF (Paris) / Lambert zone II") --> 4807 ("NTF (Paris)") -->
4326 ("WGS 84")
However, CoordinateOperationFactory ask the EPSG database only for a
transformation from 27572 to 4326 as a whole, which is not recorded in the EPSG
database. It should query the database again for the 4807 to 4326 step, which
is recorded in the EPSG database. This is necessary in order to get
informations like Bursa-Wolf parameters, which increase transformation accuracy.
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