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Geographic Information Systems (GIS): [GIS dictionary] GIS is a computer-based tool that analyzes, stores, manipulates and visualizes geographic information on a map. GIS links geographic locations on Earth with attribute information enabling users to visualize patterns, understand relationships and trends.
There are two common types of coordinate systems used in GIS: 1  A geographic coordinate system uses a three-dimensional, spherical surface to define locations on the earth (where coordinates are measured from the earth's center). Latitude and longitude define a global or spherical coordinate system.