What is GIS?

A geographic information system (GIS) lets us visualize, question, analyze, interpret, and understand data in many ways that reveal relationships, patterns, and trends in the form of maps, globes, reports, and charts. Learn more...

Getting Started

• Top Five Benefits of GIS
• What Can I Do with GIS?
• The Geographic Approach
• Glossaries & Publications

Try GIS

Virtual Globe

Use ArcGIS Explorer (free) to combine your spatial data with free map services.

Make a Nuclear Proximity Map

See how close you are to U.S. nuclear plants. More Maps