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Cahill-Keyes projection
The Cahill-Keyes projection is a polyhedral compromise map projection first proposed by Gene Keyes in 1975. The projection is a refinement of an earlier 1909 projection by Cahill. The projection was designed to achieve a number of desirable characteristics, namely symmetry of component maps (octants), scalability allowing the map to continue to work well even at high resolution, uniformity of geocells, metric-based joining edges, minimized distortion compared to a globe, and an easily understood orientation to enhance general usability and teachability.
== Construction ==
The Cahill-Keyes projection has 8 octants. The outer-edge width of those 8 octants is
divided into 40,000km, which approximates the Earth's circumference. Each octant is an equilateral triangle with 3 segments per side. The total length of each side is 10,000km. One side runs along the Equator. The inner meridians converge towards the pole. Each 1° and 5° "tile" are proportional to each other.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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