Geocart Projections

What is a projection?

Previous | Next

August epicycloidal

Classification

Geocart menu class: Miscellaneous
Conformal

Graticule

Meridians: Central meridian is straight. Other meridians are curved and concave toward the central meridian.
Parallels: Equator is straight. Other parallels are curved and concave toward the nearest pole.
Poles: Points
Symmetry: About the central meridian or the Equator

Scale

Increases rapidly with distance from the center

Distortion

Great distortion of area toward the 180th meridians in comparison with the center

Other features

Boundary of the world map is a two-cusped epicycloid. Like the Eisenlohr projection, this projection has no “singular” point at which conformality fails. Unlike the Eisenlohr, the map boundary has a varying scale.

Usage

Novelty whole-world maps

Origin

Presented by F. August and G. Bellermann in Germany in 1874

Aspects

Transverse oblique aspect used by Athelstan F. Spilhaus in 1942 to show a map of world oceans

Other names

August

Similar projections

Eisenlohr has a boundary of constant scale.
Van der Grinten IV is not conformal and has circular arcs for meridians and parallels.

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.