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https://issues.apache.org/jira/browse/SIS-260?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux closed SIS-260.
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> Geographic 3D to 2D conversions (EPSG:9659)
> -------------------------------------------
>
> Key: SIS-260
> URL: https://issues.apache.org/jira/browse/SIS-260
> Project: Spatial Information Systems
> Issue Type: Sub-task
> Components: Referencing
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Minor
> Fix For: 0.7
>
>
> The forward case (3D to 2D) is trivial: just drop the height. The reverse
> conversion however is in principle undefined, but in practice often needed.
> The "less bad" approach would be to take a mean-sea level of 0, which is
> uneasy to convert to ellipsoidal height. See §2.2.4 in IOGP Publication
> 373-7-2 – Geomatics Guidance Note number 7, part 2 – April 2015.
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