Miller cylindrical projection
A Miller projection of the Earth.
The Miller cylindrical projection is a modified Mercator projection, proposed by Osborn Maitland Miller in 1942. The latitude is scaled by a factor of 4⁄5, projected according to Mercator, and then the result is multiplied by 5⁄4 to retain scale along the equator.[1] Hence:
![{\displaystyle {\begin{aligned}x&=\lambda \\y&={\frac {5}{4}}\ln \left[\tan \left({\frac {\pi }{4}}+{\frac {2\varphi }{5}}\right)\right]={\frac {5}{4}}\sinh ^{-1}\left(\tan {\frac {4\varphi }{5}}\right)\end{aligned}}}](../I/m/448dd8b80e38c444b174e3399065fc9f9d7ebe3e.svg)
or inversely,
where λ is the longitude from the central meridian of the projection, and φ is the latitude.[2] Meridians are thus about 0.733 the length of the equator.
In GIS applications, this projection is known as: "EPSG:54003 - World Miller Cylindrical"
See also
References
- ↑ Flattening the Earth: Two Thousand Years of Map Projections, John P. Snyder, 1993, pp. 179, 183, ISBN 0-226-76747-7.
- ↑ "Miller Cylindrical Projection". Wolfram MathWorld. Retrieved 25 March 2015.
External links
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Wikimedia Commons has media related to Miller cylindrical projection. |
- Table of examples and properties of all common projections, from radicalcartography.net
- An interactive Java Applet to study the metric deformations of the Miller Projection.
- Math formulae information
- Spatial information
- Historical information
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