Numeric methods of representing locations on the earth's surface. Systems to measure horizontal and vertical distances on a planimetric map such as latitude/longitude, state plane, and universal transverse mercator (UTM). Relating map data to coordinate systems ensures accuracy when entering data from different sources. Related terms: projection system, registration.
A coordinate system is a method by which points are located in space.
reference frame or system, such as plane rectangular coordinates or spherical coordinates, that uses linear or angular quantities to designate the position of points within that particular reference frame or system. Coordinates are used to represent locations on the earth's surface relative to other locations or fixed references.