Polyconic projection class

This article is about the class of projections called "polyconic". For the specific projection called "polyconic", see American polyconic projection.
American polyconic projection of the world
Van der Grinten projection of the world.

Polyconic can refer either to a class of map projections or to a specific projection known less ambiguously as the American polyconic projection. Polyconic as a class refers to those projections whose parallels are all non-concentric circular arcs, except for a straight equator, and the centers of these circles lie along a central axis. This description applies to projections in equatorial aspect.[1]

  1. ^ An Album of Map Projections (US Geological Survey Professional Paper 1453), John P. Snyder & Philip M. Voxland, 1989, p. 4.