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 Coordinate System

A system of measurement for calculating and describing positions on the earth. There are two types of coordinate systems, geographic and projected. Geographic coordinate systems use latitude and longitude coordinates to reference real world locations, and are based on a spherical model (spheroid) of the earth. Projected coordinate systems use mathematical formulas to convert latitude and longitude coordinates from a three-dimensional surface to a two-dimensional surface.

See also the CUGIR Help section on data projections.