Add a MapProjection.equivalent(MapProjection) method
----------------------------------------------------
Key: GEOT-1268
URL: http://jira.codehaus.org/browse/GEOT-1268
Project: GeoTools
Issue Type: Bug
Components: core referencing
Reporter: Saul Farber
Assignee: Martin Desruisseaux
Priority: Minor
A MapProjection.equivalent(MapProjection) method could performs a work similar
to MapProjection.equals(Object), but check only for field values relevant to
'transform' and 'inverseTransform' methods. The purpose is to detect
MapProjection that are equivalent even in the case were parameters where
specified in a different but equivalent way. It would allows
CRS.equalsIgnoreMetadata(...) to returns 'true' in some situations where it
currently returns 'false'.
Specifically, the following two WKT definitions are not 'equalsIgnoreMetadata',
but they should be:
PROJCS["NAD_1983_StatePlane_Massachusetts_Mainland_FIPS_2001",
GEOGCS["GCS_North_American_1983",
DATUM["D_North_American_1983",
SPHEROID["GRS_1980", 6378137.0, 298.257222101]],
PRIMEM["Greenwich", 0.0],
UNIT["degree", 0.017453292519943295],
AXIS["Longitude", EAST],
AXIS["Latitude", NORTH]],
PROJECTION["Lambert_Conformal_Conic"],
PARAMETER["central_meridian", -71.5],
PARAMETER["latitude_of_origin", 41.0],
PARAMETER["standard_parallel_1", 41.71666666666667],
PARAMETER["scale_factor", 1.0],
PARAMETER["false_easting", 200000.0],
PARAMETER["false_northing", 750000.0],
PARAMETER["standard_parallel_2", 42.68333333333334],
UNIT["m", 1.0],
AXIS["x", EAST],
AXIS["y", NORTH]]
and
PROJCS["NAD83 / Massachusetts Mainland",
GEOGCS["NAD83",
DATUM["North American Datum 1983",
SPHEROID["GRS 1980", 6378137.0, 298.257222101, AUTHORITY["EPSG","7019"]],
TOWGS84[1.0, 1.0, -1.0, 0.0, 0.0, 0.0, 0.0],
AUTHORITY["EPSG","6269"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic longitude", EAST],
AXIS["Geodetic latitude", NORTH],
AUTHORITY["EPSG","4269"]],
PROJECTION["Lambert Conic Conformal (2SP)", AUTHORITY["EPSG","9802"]],
PARAMETER["central_meridian", -71.5],
PARAMETER["latitude_of_origin", 41.0],
PARAMETER["standard_parallel_1", 42.68333333333334],
PARAMETER["false_easting", 200000.0],
PARAMETER["false_northing", 750000.0],
PARAMETER["standard_parallel_2", 41.71666666666667],
UNIT["m", 1.0],
AXIS["Easting", EAST],
AXIS["Northing", NORTH],
AUTHORITY["EPSG","26986"]]
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