![]() ![]() ![]() ![]() The X-axis running through this origin runs east-west, and the Y-axis runs north-south. This ensures that all coordinates within the zone will be positive. In either case, the projection's central meridian is generally run down the approximate center of the zone.Ī Cartesian coordinate system is created for each zone by establishing an origin some distance (usually 2,000,000 feet) to the west of the zone's central meridian and some distance to the south of the zone's southernmost point. Larger states are divided into multiple zones, such as the “Colorado North Zone.” States with a long north-south axis (such as Idaho and Illinois) are usually mapped using a Transverse Mercator projection, while states with a long east-west axis (such as Washington and Pennsylvania) are usually mapped using a Lambert Conformal projection. The State Plane Coordinate System’s 120 different zones generally follow county boundaries (except in Alaska). This coordinate system’s high level of accuracy is achieved through the use of relatively small zones. The State Plane Coordinate System (SPCS), which is only used in the United States, is a plane coordinate system (north-south and east-west lines are perpendicular) in which each individual state has between one to six zones, depending on the state's size and shape. ![]()
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