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Longitude

Last Updated: October 02, 2008 Related resource areas: Geospatial Technology


An angular measurement made from the center of the earth to the east or west of the Greenwich meridian (London, England). It comprises the east/west component of the latitude/longitude coordinate system, which is used in GPS data collection. Traditionally, east is considered positive, and west is considered negative. Example: 74º west of the Greenwich meridian may be expressed as either unsigned (-74º) or signed (74º W)


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