By hosting imagery and geographic feature data on the Internet, and streaming information out only as requested by the user, Keyhole lets users navigate an enormous database -- over 7 terabytes in size for the Earth version.

Keyhole has many sources for its data, especially satellites for difficult to reach regions.

Keyhole NV is the consumer version designed for NVIDIA graphics cards that lets users interact with a detailed Earth model, and switch to Mars anytime they want.

Users can tilt the view; turn on the terrain to show mountains, canyons, valleys, and other landscape features; overlay roads and feature information; and save locations in Placemarks. Keyhole literally puts a planet in your hands, or at least on your desktop.

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