Geocart Projections

What is a projection?

Previous | Next





Meridians: Central meridian is straight. The 90th meridians are straight but bent at the 45th parallels N. and S. Other meridians are complex curves.
Parallels: Equator is straight. Other parallels are complex curves. Poles: Points, in the midpoint of opposite sides of a square bounding a hemisphere
Symmetry: About the central meridian or the Equator


Varies considerably along each meridian and parallel


Great distortion of area, especially near the 90th meridian at latitudes 45°N. or S., where conformality fails

Other features

Shows hemisphere conformally in a square and the world in a 2x1 rectangle. Hemispheres can be mosaicked to form a continuous map indefinitely.


Novelty map of a hemisphere or of the world


Presented by Emile Guyou of France in 1887


A transverse aspect is the Peirce Quincuncial projection. An oblique aspect is the Adams projection of a hemisphere in a square.

Similar projections

Listed under Aspects above

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.