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https://issues.apache.org/jira/browse/SIS-223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux reassigned SIS-223:
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Assignee: Martin Desruisseaux
> Orthographic (EPSG:9840)
> ------------------------
>
> Key: SIS-223
> URL: https://issues.apache.org/jira/browse/SIS-223
> Project: Spatial Information Systems
> Issue Type: Sub-task
> Components: Referencing
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Minor
>
> The orthographic case is a special case of _"Vertical perspective
> (ortographic case)"_ with all points on the ellipsoid (height = 0).
> An {{Orthographic}} file is available on Geotk, but can not be ported as-is
> in SIS for licensing reason, except the projection derivative formulas and
> the work on (de)normalization matrices. However we can restart from the
> formulas given in the EPSG guide. But EPSG gives ellipsoidal formulas instead
> than spherical ones, so the work is a little bit more complicated.
> See §1.3.18 in IOGP Publication 373-7-2 – Geomatics Guidance Note number 7,
> part 2 – April 2015.
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