A geographical information system is any system that captures, stores, analyzes, manages, and presents data that are linked to any location.
http://en.wikipedia.org/wiki/Geographic_information_system
GIS allows us to view, understand, question, interpret, and visualize data in many ways that reveal relationships, patterns, and trends in the form of maps, globes, reports, and charts.
http://www.gis.com/content/what-gis
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