What is GIS?
A 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. 
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GIS News
Open Data and the Future of Mapping
Relating Geography and Healthcare
The Geographic Approach to Climate Change Free e-book now available.
Try GIS
Gulf of Mexico Oil Spill Map
Make an economic impact map of the Gulf of Mexico oil spill.
Make a Demographic Map
Make an interactive demographic map and share it.
Virtual Globe
Use ArcGIS Explorer (free) to combine your spatial data with free map services.