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In the cartography of the United States, the American polyconic projection is a map projection used for maps of the United States and its regions beginning early in the 19th century. It belongs to the polyconic projection class , which consists of map projections whose parallels are non- concentric circular arcs except for the equator , which ...
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.
Rectangular polyconic projection of the world, with correct scale along the equator. The rectangular polyconic projection is a map projection was first mentioned in 1853 by the United States Coast Survey, where it was developed and used for portions of the U.S. exceeding about one square degree.
Gott, Goldberg and Vanderbei’s double-sided disk map was designed to minimize all six types of map distortions. Not properly "a" map projection because it is on two surfaces instead of one, it consists of two hemispheric equidistant azimuthal projections back-to-back. [5] [6] [7] 1879 Peirce quincuncial: Other Conformal Charles Sanders Peirce
Nicolosi globular projection distortion. Deeper tint means more distortion. Neutral color means distortion is balanced between angular deformation and areal inflation. Tissot indicatrix at 15° intervals. The Nicolosi globular projection is a polyconic map projection invented about the year 1000 by the Iranian polymath al-Biruni.
Latitudinally equal-differential polyconic projection; Leonardo's world map; List of national coordinate reference systems; Loximuthal projection; M.
The latitudinally equal-differential polyconic projection (等差分纬线多圆锥投影) is a polyconic map projection in use since 1963 in mainland China.Maps on this projection are produced by China's State Bureau of Surveying and Mapping and other publishers.
The Strebe 1995 projection with Tissot's indicatrices of distortion. Circles spaced at 30° intervals. The Strebe 1995 projection, Strebe projection, Strebe lenticular equal-area projection, or Strebe equal-area polyconic projection is an equal-area map projection presented by Daniel "daan" Strebe in 1994. Strebe designed the projection to keep ...