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.

Imaginary grids superimposed on the earth's surface that can be used to reference the exact or absolute location of a feature on the earth.

A framework used to define the positions (locations) of points in space either in two or three dimensions.

The four systems used to define the location of data points within an image; they include image, file, earth and frame coordinates. A fifth coordinate system, called world coordinates, is used with graphics.

a particular kind of reference frame or system, such as plane rectangular coordinates or spherical coordinates, that use linear or angular quantities to designate the position of points used to represent locations on the earth's surface relative to other locations or fixed references. In planimetric mapping (two dimensional coordinate system) locations are represented by x, 6, coordinate pairs while in topographic mapping (three dimensional coordinate system) locations are represented by x, y, and z values.