Formal Description
It can be computed as an oblique aspect of the Peirce quincuncial projection by rotating the axis 45 degrees. It can also be computed by rotating the coordinates −45 degrees before computing the stereographic projection; this projection is then remapped into a square whose coordinates are then rotated 45 degrees (Lee, 1976). When both hemispheres are mapped with it, and placed next to each other, it is called Guyou doubly periodic.
Read more about this topic: Guyou Hemisphere-in-a-square Projection
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