Diving Into GIS: A Starter Guide

If you were looking at television weather maps during last week's U.S. tornado activity, you were looking at a GIS, or Geographic Information System. Those red and purple splotches racing across the screen represented intensity levels of rotating storm cells. The map itself, the county lines, and the splotches were all data layer elements making up the map.

Source: http://www.technewsworld.com/rsstory/74589.html

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