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About the article
Published Online: 2013-05-27
Published in Print: 2013-06-01
Degrees of global latitude and longitude coordinates are divided into the smaller units of measurement arc-minute and arc-second, where 1°=60 arc-min and 1 arc-minute=60 arc-s. One degree of latitude is approximately 69 miles, 1 min of latitude is approximately 1.15 miles, and 1 s of latitude is approximately 100 feet. One degree of longitude varies in size with distance from the equator. At 1/3 arc-second resolution, we can accurately distinguish elevation between locations on a USA map that are 10 m or slightly more than 32 feet apart.