Directory of Map Projections

What is a projection?

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Adams world in a square I




Meridians: Central meridian is straight. The 180th meridians are straight lines bent at the latitudes 70°31′N and S. Other meridians are complex curves.
Parallels: Equator is straight. Other parallels are complex curves.
Poles: Points in midpoints of opposite sides.
Symmetry: About the central meridian or the equator.


Varies along each meridian and each parallel.


Great area distortion at the higher latitudes. Conformality fails at the poles and at two points on each of the 180th meridians.


Novel whole-world maps.

Similar projections

A general formula for representing the whole sphere or a segment of the sphere conformally in a regular polygon of three or more sides can be used to create this map and other conformal maps.


Presented by Oscar Sherman Adams (1874–1962) of the U.S. Coast and Geodetic Survey in 1925.

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.