Azimuthal equidistant projection

Azimuthal equidistant projection

The azimuthal equidistant projection is a particular map projection.A useful application for this type of projection is a polar projection in which all distances measured from the center of the map along any longitudinal line are accurate; an example of a polar azimuthal equidistant projection can be seen on the United Nations flag.

This projection is used by the USGS in the [http://nationalatlas.gov/ National Atlas of the United States of America] , and for large-scale mapping of Micronesia. It is useful for showing airline distances from center point of projection and for seismic and radio work.

Distances and directions to all places are true only from the center point of projection. Distances are correct between points along straight lines through the center. All other distances are incorrect. Distortion of areas and shapes increases dramatically, the further away one gets from center point.

Some types of wide-angle camera lenses, known as "fisheye lenses" produce an azimuthal equidistant projection of the photographed scene onto the photographic medium. These lenses allow a much wider field of view than perspective lenses, which are limited to significantly less than 180 degrees.

External links

* [http://www.radicalcartography.net/?projectionref Table of examples and properties of all common projections] , from radicalcartography.net
* [http://www.wm7d.net/azproj.shtml Online Azimuthal Equidistant Map Generator]
* [http://www.uff.br/mapprojections/AzimuthalEquidistant_en.html An interactive Java Applet to study the metric deformations of the Azimuthal Equidistant Projection] .


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  • azimuthal equidistant projection — noun : a map projection of the surface of the earth so centered at any given point that a straight line radiating from the center to any other point represents the shortest distance and can be measured to scale * * * Cartog. a projection in which …   Useful english dictionary

  • azimuthal equidistant projection — noun Date: 1942 a map projection of the surface of the earth so centered at any given point that a straight line radiating from the center to any other point represents the shortest distance and can be measured to scale …   New Collegiate Dictionary

  • azimuthal equidistant projection — Cartog. a projection in which the shortest distance between any point and a central point is a straight line, such a line representing a great circle through the central point. [1940 45] * * * …   Universalium

  • azimuthal equidistant projection — azimuth′al equidis′tant projec′tion n. geo a cartographic projection in which the shortest distance between any point and a central point is a straight line, such a line representing a great circle through the central point • Etymology: 1940–45 …   From formal English to slang

  • zenithal equidistant projection. — See azimuthal equidistant projection. * * * …   Universalium

  • zenithal equidistant projection — noun : azimuthal equidistant projection …   Useful english dictionary

  • zenithal equidistant projection. — See azimuthal equidistant projection …   Useful english dictionary

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  • azimuthalequidistant projection — azimuthal equidistant projection n. A map projection of the earth designed so that a straight line from the central point on the map to any other point gives the shortest distance between the two points. * * * …   Universalium

  • Map projection — A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy s Geography and using his second map projection A map projection is any method of representing the surface of a sphere or other …   Wikipedia

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