Keyhole was founded in 2001, released its first product in 2003, and was purchased by Google in October 2004. It relies primarily on commercial satellite images from one to two years ago. Google Earth, you may recall, is a re-branding of Keyhole, Inc.’s Earthviewer product.
The only difference is that World Wind is open source. Zoom in and look for your childhood home, fly past your favorite landmarks, study the coastlines for continental drift - you have all of the same options. NASA’s World Wind project - like Google Earth - is a 3D planetary visualization system that overlays satellite imagery, weather, political, and topological map data. In some respects the search engine behemoth is quite OS-agnostic, but the 3D virtual globe remains limited to Windows desktops only. Few of Google’s projects, rumors of projects, and acquisitions have generated as much envy among Linux users as Google Earth.
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