Directory of Map Projections

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Chamberlin trimetric

Parameters: Anchor point 1, Anchor point 2, Anchor point 3



Meridians: Complex curves.
Parallels: Complex curves.
Poles: Points.
Symmetry: Normally none.


Approximately correct from three selected widely spaced points on map to any other point on map. Cannot be exactly correct.


Low distortion throughout map if three source points are properly placed near map limits.


Atlas maps of continents by the National Geographic Society and some other atlas publishers.

Similar projections

Azimuthal equidistant projection; true distance and direction from one point.
Two-Point equidistant projection; true distance but not direction from two points.


Presented by Wellman Chamberlin (1908-76) of the National Geographic Society in 1946.

Description adapted from J.P. Snyder and P.M. Voxland, An Album of Map Projections, U.S. Geological Survey Professional Paper 1453. United States Government Printing Office: 1989.