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| author | Kristian Evers <kristianevers@gmail.com> | 2018-02-28 22:37:13 +0100 |
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| committer | Kristian Evers <kristianevers@gmail.com> | 2018-02-28 22:37:13 +0100 |
| commit | be3791ffd5e802d5a3d38fa08f5ed24715b73c7c (patch) | |
| tree | 25eff60d91fed8ffce3302e37818f5bc452b16ca /docs/source/operations/projections/natearth.rst | |
| parent | db2bfdce6df26801584be562f0ac74648ef8cefd (diff) | |
| download | PROJ-be3791ffd5e802d5a3d38fa08f5ed24715b73c7c.tar.gz PROJ-be3791ffd5e802d5a3d38fa08f5ed24715b73c7c.zip | |
Move 'Coordinate operations' to top level of docs [skip ci]
Diffstat (limited to 'docs/source/operations/projections/natearth.rst')
| -rw-r--r-- | docs/source/operations/projections/natearth.rst | 47 |
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diff --git a/docs/source/operations/projections/natearth.rst b/docs/source/operations/projections/natearth.rst new file mode 100644 index 00000000..57dd96db --- /dev/null +++ b/docs/source/operations/projections/natearth.rst @@ -0,0 +1,47 @@ +.. _natearth: + +******************************************************************************** +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 + + +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>`_ |
