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Winkel Tripel

Release 9.2
Last modified August 3, 2007
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Description

A compromise projection used for world maps that averages the coordinates from the Equirectangular (Equidistant Cylindrical) and Aitoff projections. Developed by Oswald Winkel in 1921.
Learn about the Equirectangular (Equidistant Cylindrical) projection
Learn about the Aitoff projection

Illustration of the Winkel Tripel projection


Projection method

Modified azimuthal—coordinates are the average of the Aitoff and Equirectangular projections. Meridians are equally spaced and concave toward the central meridian. The central meridian is a straight line. Parallels are equally spaced curves, concave toward the poles. The poles are approximately 0.4 times the length of the equator. The length of the poles depends on the standard parallel chosen.
Learn about the Aitoff projection
Learn about the Equirectangular projection


Linear graticules

The equator and the central meridian.


Properties


Shape



Shape distortion is moderate. In the polar regions along the outer meridians, the distortion is severe.

Area



Distortion is moderate. In the polar regions along the outer meridians, the distortion is severe.

Direction



Generally distorted.

Distance



Generally, scale is made true along latitudes 50.467° N and S or 40° N and S. The second case is used by Bartholomew Ltd., a British mapmaking company.


Limitations

Neither conformal nor equal area. Useful only for world maps.


Uses and applications

Developed for use in general and thematic world maps.

Used by the National Geographic Society since 1998 for general and thematic world maps.


Parameters


Desktop





Workstation





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