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POSC Specifications Version 2.2.2 |
Epicentre Usage Guide Projections and Projected Coordinate Systems |
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This projection was popular before the advent of modern computers due to its ease of mechanical construction, particularly in the United States. It is neither conformal nor equal area, and is distortion-free only along the longitude of origin. A modified form of the polyconic projection was adopted in 1909 for the International Map of the World series of 1/1,000,000 scale topographic maps. A general study of the polyconic family of projections was published in 1919 (and reprinted in 1934) by Oscar Adams of the US Geological Survey. The mathematical treatment of the American Polyconic is covered on pages 124-131 of USGS professional paper 1395 by J.P.Snyder.
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