The Guyou hemisphere-in-a-square projection is a conformal map projection for the hemisphere (except for the four angles of the square where the conformality fails). It is an oblique aspect of the Peirce quincuncial projection. When it is used to represent the entire sphere it is known as the Guyou doubly periodic projection (see also doubly periodic function).
Read more about Guyou Hemisphere-in-a-square Projection: History, Formal Description, Properties, Related Projections
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