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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 updated SIS-223:
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Description:
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 conversion 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.
was:
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 conversion derivative formulas and the
work on (de)normalization matrices. However this map conversion is relatively
simple, so we can restart from the formulas given in the EPSG guide.
See §1.3.18 in IOGP Publication 373-7-2 – Geomatics Guidance Note number 7,
part 2 – April 2015.
> 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
> 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 conversion 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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