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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-427) Need a MathTransform.getFunctionProperties() method
Date Sat, 28 Jul 2018 10:09:00 GMT
Martin Desruisseaux created SIS-427:
---------------------------------------

             Summary: Need a MathTransform.getFunctionProperties() method
                 Key: SIS-427
                 URL: https://issues.apache.org/jira/browse/SIS-427
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Referencing
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux


The Mollweide projection added by SIS-426 is not _surjective_: not all (_x_, _y_) values can
be mapped to a (_latitude_, _longitude_) values. Consequently current implementation of {{CRS.suggestCommonTarget(…)}},
which is to suggest converting projected coordinates to geographic coordinates, may not work
for Mollweide. For that projection, it may be more reliable to convert geographic coordinates
to projected coordinates.

For allowing {{CRS.suggestCommonTarget(…)}} to make a better choice, we need to know more
about the {{MathTransform}} properties. One approach would be to add a {{getFunctionProperties()}}
method which would return an {{Set<FunctionProperty>}}. This set can tell us if the
function is invertible, injective, surjective or bijective.




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