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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.
History of GIS. A GIS (geographic or geospatial information  system) is a modern extension of traditional cartography with one fundamental similarity and two essential differences. The similarity lies in the fact that both a cartographic document and a GIS contain examples of a base map to which additional data can be added.