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https://issues.apache.org/jira/browse/SIS-303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux resolved SIS-303.
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Resolution: Fixed
> Do not allow instantion of CompoudCRS with Geographic2D + ellipsoidal height
> ----------------------------------------------------------------------------
>
> Key: SIS-303
> URL: https://issues.apache.org/jira/browse/SIS-303
> Project: Spatial Information Systems
> Issue Type: Task
> Components: Referencing
> Affects Versions: 0.4, 0.5, 0.6, 0.7
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Fix For: 0.8
>
>
> {{DefaultCompoundCRS}} can be used for combining various kind of
> {{SingleCRS}} instances, for example a {{ProjectedCRS}} and a
> {{TemporalCRS}}. But there is one combination which is explicitly forbidden
> by ISO 19111: a two-dimensional {{GeographicCRS}} instance with a
> {{VerticalCRS}} of type _"ellipsoidal height"_. In this particular case, a
> three-dimensional {{GeographicCRS}} instance shall be created instead.
> There is currently nothing in Apache SIS that enforce the above directive.
> Consequently geographic CRS with ellipsoidal height can currently appear in
> two different forms (one legal and one illegal). This will complicate the
> search for transformation paths when we will implement
> {{CoordinateOperationFactory}}. We should add a check in
> {{DefaultCompoundCRS}} constructor that disallows the illegal form, but this
> will break the code of all users that were not aware of the three-dimensional
> geographic CRS special case.
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