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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-302) Implement the spherical case of EllipsoidToCentric
Date Thu, 12 Nov 2015 14:15:10 GMT
Martin Desruisseaux created SIS-302:
---------------------------------------

             Summary: Implement the spherical case of EllipsoidToCentric
                 Key: SIS-302
                 URL: https://issues.apache.org/jira/browse/SIS-302
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Referencing
    Affects Versions: 0.7
            Reporter: Martin Desruisseaux
            Priority: Minor


The _"Ellipsoid to (geo)centric"_ transform currently target only Cartesian coordinate system.
It should be easy to make it target spherical coordinate system too, since it is basically
a matter of *not* performing the last calls to sin(λ) and sin(λ), and compute an arc-tangent
for φ. More specifically we need to:

* Add a {{SPHERICAL}} enum value to {{EllipsoidToCentric.TargetType}}.
* Add a {{boolean}} field in {{EllipsoidToCentric}} for storing the target CS type in an efficient
way.
* Take the above-cited field in account in the following formulas:
** {{transform}} (forward conversion).
** {{inverseTransform}} (inverse conversion).
** {{transform}} : {{Matrix}} (derivative computation).




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