Inconsistent CRS creation in GeoTiffWriterTest
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Key: GEOT-1261
URL: http://jira.codehaus.org/browse/GEOT-1261
Project: GeoTools
Issue Type: Bug
Components: gc geotiff
Affects Versions: 2.4.M2
Reporter: Martin Desruisseaux
Since GEOT-1237 fix, we have a new test failure in {{GeoTiffWriterTest}}. The
{{sourceCRS}} and {{targetCRS}} are no longer equal. The bug is subtle, since
source and target WKT seem closely identical:
{code:none}
PROJCS["NAD27 / California zone VI",
GEOGCS["NAD27",
DATUM["North American Datum 1927",
SPHEROID["Clarke 1866", 6378206.4, 294.9786982138982,
AUTHORITY["EPSG","7008"]],
TOWGS84[-4.2, 135.4, 181.9, 0.0, 0.0, 0.0, 0.0],
AUTHORITY["EPSG","6267"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic longitude", EAST],
AXIS["Geodetic latitude", NORTH],
AUTHORITY["EPSG","4267"]],
PROJECTION["Lambert Conic Conformal (2SP)", AUTHORITY["EPSG","9802"]],
PARAMETER["central_meridian", -116.25],
PARAMETER["latitude_of_origin", 32.166666666666664],
PARAMETER["standard_parallel_1", 33.88333333333333],
PARAMETER["false_easting", 609601.2192024385],
PARAMETER["false_northing", 0.0],
PARAMETER["standard_parallel_2", 32.78333333333333],
UNIT["m", 1.0],
AXIS["Easting", EAST],
AXIS["Northing", NORTH]]
{code}
Note the "metres" units, while we would expect feets units for this CRS.
Inspection of {{ProjectedCRS.getConversionFromBase().getMathTransform()}} on
{{sourceCRS}} show that this CRS is built with a concatenation involving a
"metres to feet" affine transform, which is inconsistent with the {{UNIT["m",
1.0]}} element above. The concequence is that
{{CRS.findMathTransform(targetCRS, sourceCRS)}} produces the following math
transform, while we would expect the identity transform:
{code:none}
PARAM_MT["Affine",
PARAMETER["num_row", 3],
PARAMETER["num_col", 3],
PARAMETER["elt_0_0", 3.280833333333333],
PARAMETER["elt_1_1", 3.280833333333333]]
{code}
My question is: which code created the {{sourceCRS}}? If it is from a
"standard" method from the referencing module, we have a bug that need to be
fixed quickly. If it is some custom code in the GeoTIFF module, we may need to
revisit the way this module handle CRS (it may be a more long-term task).
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