Collignon projection

Collignon projection

The Collignon Projection is a pseudocylindrical map projection first known to be published by Édouard Collignon in 1865 and subsequently cited by A. Tissot in 1881.

For the smallest choices of the parameters chosen for this projection, the sphere may be mapped either to a single diamond, a pair of squares or a triangle. (Another projection that maps each hemisphere to a square is the quincuncial map).

It is used in the polar areas as part of the HEALPix spherical projection, which is widely used in physical cosmology in making maps of the cosmic microwave background, in particular by the WMAP and future Planck Surveyor space missions.

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