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Natural Earth projection : ウィキペディア英語版
Natural Earth projection

The Natural Earth projection is a pseudocylindrical map projection designed by Tom Patterson. It is neither conformal nor equal-area.
==Definition==
The Natural Earth is defined by the following formulas:
: x = 0.8707 \times l(\varphi) \times \lambda,
: y = 0.8707 \times 0.52 \times d(\varphi) \times \pi,
where
* x, y are the Cartesian coordinates;
* \lambda is the longitude from the central meridian;
* \varphi is the latitude;
* l(\varphi) is the length of the parallel at latitude \varphi;
* d(\varphi) is the distance of the parallel from the equator at latitude \varphi.
l(\varphi) and d(\varphi) are given in this table:
The values of the above functions for other latitudes are calculated by interpolation. The values for the southern hemisphere are calculated by changing the sign of the corresponding values for the northern hemisphere.

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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