Polyconic projection class

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]

American polyconic projection of the world
Van der Grinten projection of the world.

Polyconic projections

Some of the projections that fall into the polyconic class are:

A series of polyconic projections, each in a circle, was also presented by Hans Mauer in 1922,[2] who also presented an equal-area polyconic in 1935.[3]:248 Another series by Georgiy Aleksandrovich Ginzburg appeared starting in 1949.[3]:258–262

See also

References

  1. An Album of Map Projections (US Geological Survey Professional Paper 1453), John P. Snyder & Philip M. Voxland, 1989, p. 4.
  2. https://pubs.usgs.gov/pp/1453/report.pdf
  3. John P. Snyder (1993). Flattening the Earth: Two Thousand Years of Map Projections. ISBN 0-226-76747-7.


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