위도와 경도
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정의
각도 도(°)를 사용하여 지구 표면의 모든 지점을 고유하게 식별하는 지리 좌표계로, 위도는 ±90°, 경도는 ±180° 범위이다.
설명
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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