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Stereographic (Snyder)

Stereographic is conformal projection that is a true perspective projection, the only one that is both. It was possibly devised by Hipparchus in the second century BC. The observers point of view is just above the surface of the earth.

The Snyder variation of the Stereographic is used mostly in the U.S.A. For other regions of the world, it is more common to use the other variety, "Oblique Stereographic."