Chamberlin trimetric projection

The Chamberlin trimetric projection is a map projection where three points are fixed on a sphere and used to triangulate the transformation onto a plane. It was developed in 1947 by Wellman Chamberlin, chief cartographer of the National Geographic Society.

Unlike a plane-to-plane triangulation, where three compass circles will intersect at a unique point, the Chamberlin trimetric projection will map compass circles from a sphere in such a way so that each pair of circles will result in distinct points of intersection. Usually a triangle is generated from these intersections and the barycenter is chosen to be the point of mapping.

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