緯度と経度
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定義
角度の度数を用いて地球上の任意の点を一意に特定する地理座標系で、緯度は±90°、経度は±180°の範囲をとる。
解説
Latitude measures distance north or south of the equator (0°), while longitude measures east or west of the Prime Meridian through Greenwich, England. One degree of latitude equals approximately 111 km regardless of position, but one degree of longitude shrinks to zero at the poles. GPS satellites rely entirely on this system to provide positioning accurate to within a few meters.
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