Directory of Map Projections

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Boggs eumorphic




Meridians: Central meridian is a straight line half as long as the equator. Other meridians are equally spaced complex curves intersecting at the poles and concave toward the central meridian.
Parallels: Unequally spaced straight parallel lines perpendicular to the central meridian.
Poles: Points.
Symmetry: About the central meridian or the equator.


True along latitudes 40°15′N and S. Constant along any given latitude; same for the latitude of opposite sign.


Distortion is severe near outer meridians at high latitudes but can be substantially reduced by interruption. Free of distortion only at latitudes 40°15′N and S. At the central meridian.

Other features

Designed as the arithmetic mean of the sinusoidal and Mollweide projections for north-south (y) coordinates only, when drawn with the same area scale.


Thematic world maps in atlases and textbooks, usually in interrupted form.

Similar projections

Several pseudocylindrics, such as the sinusoidal and Craster parabolic.


Presented by S. Whittemore Boggs (1884-1954) of the U.S. Department of State in 1929.

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.