World Wind

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World Wind是NASA研发的一个类似google earth的软件(免费),大家有兴趣的可以一试.

World Wind is open source Windows software that lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there.

http://worldwind.arc.nasa.gov/