This section has information on sources of various free mapping data and tools available. If you are aware of other useful sources, please send us the link.

Google Earth Google Earth is part of the "Google Pack"	Arc Explorer ArcGIS Explorer can create maps, explore geospatial data, and share the results.
Nasa Worldwind Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind softwarelets you experience Earth in 3D.	Landsat Data Landsat represents the world's longest continuously acquired collection of space-based land remote sensing data.