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| author | Even Rouault <even.rouault@spatialys.com> | 2020-09-25 22:53:38 +0200 |
|---|---|---|
| committer | Even Rouault <even.rouault@spatialys.com> | 2020-09-26 11:09:23 +0200 |
| commit | 2e104e092578347de11208e9a3a80a3bf711265d (patch) | |
| tree | 821679ce3db494a531c7727ad4b5db926b005370 /docs | |
| parent | 485509f3b3f5133f0bb0db5ef63e932615fa2f2e (diff) | |
| download | PROJ-2e104e092578347de11208e9a3a80a3bf711265d.tar.gz PROJ-2e104e092578347de11208e9a3a80a3bf711265d.zip | |
Implement ellipsoidal formulation of +proj=ortho (fixes #397)
- Map ESRI 'Local' to +proj=ortho when Scale_Factor = 1 and Azimuth = 0
- Map ESRI 'Orthographic' to a PROJ WKT2 'Orthographic (Spherical)'
which maps to +proj=ortho +f=0 to froce spherical evaluation
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/source/operations/projections/ortho.rst | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/docs/source/operations/projections/ortho.rst b/docs/source/operations/projections/ortho.rst index 2e8de9ca..2d0e08a8 100644 --- a/docs/source/operations/projections/ortho.rst +++ b/docs/source/operations/projections/ortho.rst @@ -10,7 +10,7 @@ around a given latitude and longitude. +---------------------+--------------------------------------------------------+ | **Classification** | Azimuthal | +---------------------+--------------------------------------------------------+ -| **Available forms** | Forward and inverse, spherical projection | +| **Available forms** | Forward and inverse, spherical and ellipsoidal | +---------------------+--------------------------------------------------------+ | **Defined area** | Global, although only one hemisphere can be seen at a | | | time | @@ -31,6 +31,12 @@ around a given latitude and longitude. proj-string: ``+proj=ortho`` + +.. note:: Before PROJ 7.2, only the spherical formulation was implemented. If + wanting to replicate PROJ < 7.2 results with newer versions, the + ellipsoid must be forced to a sphere, for example by adding a ``+f=0`` + parameter. + Parameters ################################################################################ @@ -40,6 +46,8 @@ Parameters .. include:: ../options/lat_0.rst +.. include:: ../options/ellps.rst + .. include:: ../options/R.rst .. include:: ../options/x_0.rst |