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| author | Even Rouault <even.rouault@spatialys.com> | 2022-02-21 16:38:06 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-02-21 16:38:06 +0100 |
| commit | 1941f06e2767891e0d24e0547bbf7508b2839963 (patch) | |
| tree | 6d2da3cc57fd19ffefeb8ea78240dd6bee396eaf | |
| parent | 0bcdaae07d17f1f7b2df4b56523c8902a76de858 (diff) | |
| parent | 009d9a401bb7c321e1d4c387b9fe2fb4f1645879 (diff) | |
| download | PROJ-1941f06e2767891e0d24e0547bbf7508b2839963.tar.gz PROJ-1941f06e2767891e0d24e0547bbf7508b2839963.zip | |
Merge pull request #3064 from rouault/doc_gall_peters
Doc: mention Behrmann and Gall-Peters projections as specializations of cea
| -rw-r--r-- | docs/source/operations/projections/cea.rst | 27 | ||||
| -rw-r--r-- | docs/source/operations/projections/gall.rst | 4 |
2 files changed, 30 insertions, 1 deletions
diff --git a/docs/source/operations/projections/cea.rst b/docs/source/operations/projections/cea.rst index 3799fbcb..3f8af65f 100644 --- a/docs/source/operations/projections/cea.rst +++ b/docs/source/operations/projections/cea.rst @@ -28,6 +28,22 @@ Equal Area Cylindrical proj-string: ``+proj=cea`` +Named specializations +################################################################################ + +The Equal Area Cylindrical projection is sometimes known under other names when +it is instanciated with particular values of the ``lat_ts`` parameter: + ++----------------------------------+------------+ +| **Name** | **lat_ts** | ++----------------------------------+------------+ +| Lambert cylindrical equal-area | 0 | ++----------------------------------+------------+ +| Behrmann | 30 | ++----------------------------------+------------+ +| Gall-Peters | 45 | ++----------------------------------+------------+ + Parameters ################################################################################ @@ -51,4 +67,13 @@ Parameters ``lat_ts`` and ``k_0`` are mutually exclusive. If ``lat_ts`` is specified, it is equivalent to setting ``k_0`` to - :math:`\frac{\cos \phi_{ts}}{\sqrt{1 - e^2 \sin^2 \phi_{ts}}}`
\ No newline at end of file + :math:`\frac{\cos \phi_{ts}}{\sqrt{1 - e^2 \sin^2 \phi_{ts}}}` + +Further reading +############### + +#. `Wikipedia: Lambert cylindrical equal-area <https://en.wikipedia.org/wiki/Lambert_cylindrical_equal-area_projection>`_ + +#. `Wikipedia: Gall-Peters <https://en.wikipedia.org/wiki/Gall%E2%80%93Peters_projection>`_ + +#. `Wikipedia: Behrmann <https://en.wikipedia.org/wiki/Behrmann_projection>`_ diff --git a/docs/source/operations/projections/gall.rst b/docs/source/operations/projections/gall.rst index 8114815a..ba83d450 100644 --- a/docs/source/operations/projections/gall.rst +++ b/docs/source/operations/projections/gall.rst @@ -42,6 +42,10 @@ It is used in several British atlases, but seldom in the United States. The Gall projection is neither conformal nor equal-area, but has a blend of various features. Unlike the Mercator, the Gall shows the poles as lines running across the top and bottom of the map. +.. note:: + + The Gall projection must not be confused with the Gall-Peters one, the later + being a specialization of :ref:`cea`. Example using Gall Stereographic :: |