NASA’s free World Wind software lets you zoom from satellite altitude into any place on Earth. Data from various satellites lets you experience Earth terrain in visually rich 3D, just as if you were really there. You can visit any place in the world, from your home town to the Grand Canyon, via the Alps and the African Sahara.
The software weighs in at a hefty 180MB (and more, it downloads a lot of its image data on the fly) and is available via HTTP and BitTorrent – possibly the US Government’s first use of the controversial technology.
