John C Cartwright a écrit :
I'm getting a
NoSuchIdentifierException: No transform for classification "Equirectangular"
exception in trying to create a Plate Carree or Equirectangular
projected coordinate system. I thought "Plate_Carree" was a valid EPSG
identifier, but I'm certain that "Equirectangular" is. Can anyone tell
me what I'm doing wrong in the code below. Full stack trace at the end
of the message.
The formulas for "Equirectangular" are not yet implemented in Geotools
(the transformation formulas need to be implemented in Java, they can't
be inferred automatically from the EPSG database). Currently implemented
projections can be listed from SVN:
http://svn.geotools.org/geotools/trunk/gt/module/referencing/src/org/geotools/referencing/operation/projection/
On the bright side, adding a new projetion is not really hard.
Developpers can copy-and-paste the Mercator.java class in the
above-cited link, and replace the transformNormalized(...) and
inverseTransformNormalized(...) method body by the new projection code
(ported for example from the Proj4 C library). The most tedious (but
very important) part is to test the projection.
If there is a volunter on geotools mailing list whiling to send me a
Equirectangular.java class with correct transformNormalized(...)
methods, and whiling to test it, I would be happy to make the
integration in Geotools.
-------------------------------------------------------------------
Note: (to be more accurate)
For building CRS, Geotools take most of its informations in the EPSG
database. The most important exception (by far) is the table
OperationMethod. Informations that appears in the EPSG OperationMethods
table are used, but are not suffisient. The actual method must also be
hard coded in Java, since it is about numerical computation. Supported
OperationMethods can be listed by the following command line:
java org.geotools.referencing.operation.DefaultMathTransformFactory
Windows users may need to provide an "-encoding 850" argument in order
to get a proper output, where "850" is the number displayed by the
"chcp" DOS command.
Martin.
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