Parameters: Anchor point 1, Anchor point 2, Anchor point 3
Geocart menu class: Azimuthal
Neither conformal nor equal area
Meridians: Complex curves
Parallels: Complex curves
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
Presented by Wellman Chamberlin (1908-76) of the National Geographic Society in 1946
Azimuthal Equidistant projection; true distance and direction from one point
Two-Point Equidistant projection; true distance but not direction from two points
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.