[jira] [Created] (SIS-428) Allow derivative to be specified by the inverse projection instead than the forward one

["Martin Desruisseaux (JIRA)" <ji...@apache.org>]

Martin Desruisseaux created SIS-428:
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             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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