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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SIS-302) Implement the spherical case of EllipsoidToCentric
Date Tue, 15 Mar 2016 13:07:33 GMT

     [ https://issues.apache.org/jira/browse/SIS-302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux updated SIS-302:
------------------------------------
    Fix Version/s:     (was: 0.7)

> 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
>            Assignee: 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).
> We could also opportunistically implement the cylindrical case, but its interest is not
obvious.



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