词条 | Armadillo projection |
释义 |
The armadillo projection is a map projection used for world maps. It is neither conformal nor equal-area but instead affords a view evoking a perspective projection while showing most of the globe instead of the half or less that a perspective would. The projection was presented in 1943 by Erwin Raisz (1893–1968) as part of a series of "orthoapsidal" projections, which are perspectives of the globe projected onto various surfaces. This one in the series has the globe projected onto half a torus. Raisz singled it out and named it the "armadillo" projection. The toroidal shape and the angle it is viewed from tend to emphasize continental areas by eliminating or foreshortening swaths of ocean. In the pure case of projecting the half-torus, New Zealand cannot be seen, as in the images here. However, in publications, the projection often develops a "pigtail" which shows the rest of Australia as well as New Zealand. Raisz coined the term orthoapsidal as a combination of orthographic and apsidal. He used it to mean drawing a parallel-meridian network, or graticule, on any suitable solid other than a sphere, and then making an orthographic projection of that.[2] FormulasGiven a radius of sphere R, central meridian λ0 and a point with geographical latitude φ and longitude λ, plane coordinates x and y can be computed using the following formulas:[3] In this formulation, no latitude more southerly than φs should be plotted for the given longitude. The y-axis coincides with the central meridian. See also{{Portal|Atlas}}
References1. ^1 {{cite book | title = An Album of Map Projections | last = Snyder | first = John P. | authorlink = John P. Snyder | year = 1989 | publisher = USGS | location = Denver | series = Professional Paper 1453 | isbn = 978-0160033681 | pages = 238 | url = https://pubs.er.usgs.gov/usgspubs/pp/pp1453 | accessdate = 2014-09-27 }} [1][2]2. ^1 {{cite book | title = Principle of Geography | last = Raisz | first = Erwin J. | authorlink = Erwin Raisz | year = 1962 | publisher = McGraw-Hill | location = New York | pages = 181 }} }} External links
1 : Map projections |
随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识,基本涵盖了大多数领域的百科知识,是一部内容自由、开放的电子版国际百科全书。