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| author | Kristian Evers <kristianevers@gmail.com> | 2016-12-17 22:04:24 +0100 |
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| committer | Kristian Evers <kristianevers@gmail.com> | 2016-12-17 22:04:24 +0100 |
| commit | 83f8af8bfc9b3f880904d3d88be4648648a18d36 (patch) | |
| tree | 5eb445ea637a832fb53bbc2df549abcd852a7654 /docs | |
| parent | 8793a3869c030e8c91aeca6ed901d4419a787893 (diff) | |
| download | PROJ-83f8af8bfc9b3f880904d3d88be4648648a18d36.tar.gz PROJ-83f8af8bfc9b3f880904d3d88be4648648a18d36.zip | |
Migrated Natural Earth doc page from trac
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/source/projections/natearth.rst | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/docs/source/projections/natearth.rst b/docs/source/projections/natearth.rst index de4460cc..57dd96db 100644 --- a/docs/source/projections/natearth.rst +++ b/docs/source/projections/natearth.rst @@ -3,8 +3,45 @@ ******************************************************************************** Natural Earth ******************************************************************************** ++---------------------+--------------------------------------------------------+ +| **Classification** | Pseudo cylindrical | ++---------------------+--------------------------------------------------------+ +| **Available forms** | Forward and inverse, spherical projection | ++---------------------+--------------------------------------------------------+ +| **Defined area** | Global | ++---------------------+--------------------------------------------------------+ +| **Implemented by** | Bernhard Jenny | ++---------------------+--------------------------------------------------------+ +| **Options** | ++---------------------+--------------------------------------------------------+ +| `No special options for this projection` | ++---------------------+--------------------------------------------------------+ .. image:: ./images/natearth.png :scale: 50% - :alt: Natural Earth + :alt: Natural Earth + +The Natural Earth projection is intended for making world maps. A distinguishing trait +is its slightly rounded corners fashioned to emulate the spherical shape of Earth. +The meridians (except for the central meridian) bend acutely inward as they approach +the pole lines, giving the projection a hint of three-dimensionality. This bending +also suggests that the meridians converge at the poles instead of truncating at the +top and bottom edges. The distortion characteristics of the Natural Earth projection +compare favorably to other world map projections. + + +Usage +############################################################################### + +The Natural Earth projection has no special options so usage is simple. Here is +an example of an inverse projection on a sphere with a radius of 7500 m:: + + $ echo 3500 -8000 | proj -I +proj=natearth +a=7500 + 37d54'6.091"E 61d23'4.582"S + + +Further reading +################################################################################ + +#. `Wikipedia <https://en.wikipedia.org/wiki/Natural_Earth_projection>`_ |