Google Earth is a virtual globe,map and geographical information program that was originally called EarthViewer 3D, and was created by Keyhole, Inc, a Central Intelligence Agency (CIA) funded company acquired by Google in 2004 (see In-Q-Tel). It maps the Earth by the superimposition of images obtained from satellite imagery, aerial photographyand GIS 3D globe. It was available under three different licenses, two currently: Google Earth, a free version with limited function; Google Earth Plus (discontinued),[3][4] which included additional features; and Google Earth Pro ($399 per year), which is intended for commercial use.[5]
The product, re-released as Google Earth in 2005, is currently available for use on personal computers running Windows 2000 and above, Mac OS X 10.3.9 and above, Linux kernel: 2.6 or later (released on June 12, 2006), and FreeBSD. Google Earth is also available as abrowser plugin which was released on May 28, 2008.[6] It was also made available for mobile viewers on the iPhone OS on October 28, 2008, as a free download from the App Store, and is available to Android users as a free app in the Google Play store. In addition to releasing an updated Keyhole based client, Google also added the imagery from the Earth database to their web-based mapping software, Google Maps. The release of Google Earth in June 2005 to the public caused a more than tenfold increase in media coverage onvirtual globes between 2004 and 2005,[7] driving public interest in geospatial technologies and applications. As of October 2011 Google Earth has been downloaded more than a billion times.[8][9]Google Earth is simply based on 3D maps, with the capability to show 3D buildings and structures (such as bridges), which consist of users' submissions using SketchUp, a 3D modeling program software. In prior versions of Google Earth (before Version 4), 3D buildings were limited to a few cities, and had poorer rendering with no textures. Many buildings and structures from around the world now have detailed 3D structures; including (but not limited to) those in the United States, Canada, Australia, Ireland, India, Japan, United Kingdom,[12] Germany, Pakistan and the cities, Amsterdam and Alexandria. In August 2007,Hamburg became the first city entirely shown in 3D, including textures such as façades
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