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From "Martin Desruisseaux (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (SIS-223) Orthographic (EPSG:9840)
Date Sat, 19 Oct 2019 14:30:00 GMT

     [ https://issues.apache.org/jira/browse/SIS-223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux reassigned SIS-223:
---------------------------------------

    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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