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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-428) Allow derivative to be specified by the inverse projection instead than the forward one
Date Sat, 28 Jul 2018 12:49:00 GMT
Martin Desruisseaux created SIS-428:
---------------------------------------

             Summary: Allow derivative to be specified by the inverse projection instead than
the forward one
                 Key: SIS-428
                 URL: https://issues.apache.org/jira/browse/SIS-428
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Referencing
            Reporter: Martin Desruisseaux


The way {{NormalizedProjection}} API is designed, derivatives can be computed only by the
direct transform. This was based on the assumption that forward projections are always simpler
than inverse projection. But the Mollweide projection (SIS-426) breaks this assumption. With
current API computing the derivative of the inverse Mollweide projection implies creating
that matrices, inverting it, then inverting it back again to the original matrix. We need
a way to return the first matrix directly instead.

See {{inverseDerivate}} method in {{Mollweide}} class.



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