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Center of population ：ウィキペディア英語版

Center of population

In demographics, the center of population (or population center) of a region is a geographical point that describes a centerpoint of the region's population. There are several different ways of defining such a "center point", leading to different geographical locations; these are often confused.
==Definitions==
Three commonly used (but different) center points are:
# the ''mean center'', also known as the ''centroid'' or ''center of gravity'';
# the ''median center'', which is the intersection of the median longitude and median latitude;
# the ''geometric median'', also known as ''Weber point'', ''Fermat–Weber point'', or ''point of minimum aggregate travel''.
A further complication is caused by the curved shape of the Earth. Different center points are obtained depending on whether the center is computed in three-dimensional space, or restricted to the curved surface, or computed using a flat map projection.

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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