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Google Earth is a virtual globe, map and Geographical information program That Was Originally called EarthViewer 3D 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 photography and geographic information system (GIS) onto a 3D globe. It Was Originally available with three Different license, soft has SINCE been reduced to just two: Google Earth (a free version with limited function) and Google Earth Pro, Which is now free (it Previously cost $ 399 a year) and is intended for commercial use.  The original third option, Google Earth Plus has been discontinued.  
The product, re-released as Google Earth in 2005 is 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. Also Google Earth is available as a browser plugin which was released on May 28, 2008.  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 developer’s 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 on virtual globes between 2004 and 2005  driving public interest in geospatial technologies and applications. As of October 2011, Google Earth has been downloaded more than a billion times.  
Google Earth displays satellite images of varying resolution of the Earth’s surface, allowing users to see things like cities and houses looking perpendicularly down or at an oblique angle (See also bird’s eye view). The degree of resolution available is based somewhat on the points of interest and Popularity, But Most land (except For some islands) is covered in at Least 15 Meters of resolution. Maps Showing a visual representation of Google Earth Coverage Melbourne, Victoria, Australia; Las Vegas, Nevada, United States; and Cambridge, Cambridgeshire, United Kingdom include Examples of the Highest resolution, at 15 cm (6 inches). Google Earth Allows users to search for addresses for Some Countries, enter coordinates, or simply use the mouse to browse to a location.
For large parts of the surface of the Earth only 2D images are available, from almost vertical photography. Viewing this from an oblique angle, there is perspective in the sense That Which are Horizontally objects far away are seen smaller, like viewing a large photograph, not quite like a 3D view.
For other parts of the surface of the Earth 3D images of terrain and buildings are available. Google Earth uses digital elevation model (DEM) data collected by NASA’s Shuttle Radar Topography Mission (SRTM).  This means one Can View Entire almost the earth in three dimensions. Since November 2006, the 3D views of mountains Many, Including Mount Everest, have been Improved by the use of supplementary DEM data to thread the gaps in SRTM Coverage. 
Some people use the applications to add Their own data, available through Making Various sources say, Such as the Bulletin Board Systems (BBS) or blogs Mentioned in the link section below. Google Earth is Able to show Various Kinds of images overlaid on the surface of the earth and is Also a Web Map Service client. Managing supports Google Earth three-dimensional Geospatial data through Keyhole Markup Language (KML).
Google Earth is simply based on 3D maps, with the capability to show 3D buildings and the structures (Such as bridges), the qual consis of users’ Submissions using SketchUp, a 3D modeling software program. In Prior versions of Google Earth (before Version 4), 3D buildings Were limited to a few cities, and hadd Poorer rendering with no textures. Many buildings and Structures from around the world now have the structure Detailed 3D; Including (But not limited to) Those in the United States, Canada, Mexico, India, Japan, United Kingdom, Spain, Germany, Pakistan and the cities, Amsterdam and Alexandria. In August 2007, Hamburg became the first city entirely shown in 3D, textures Including Such as facades. The ‘Westport3D’ Was model created by 3D imaging firm AM3TD using long-distance laser scanning technology and digital photography and is the first Such model of an Irish town to be created. As It Was Developed initially to aid Local Government in carrying out functions of developer’s town Planning Includes the Highest-resolution photo-realistic textures to swear found anywhere in Google Earth. Three-dimensional renderings are available for CERTAIN buildings and the structure around the world via Google’s 3D Warehouse  and other websites. In June 2012, Google Announced That It Will start to replace user Submitted 3D buildings with auto-generated 3D mesh buildings starting with major cities. Although there are Many cities on Google Earth That are fully or partially 3D, more are available in the Earth Gallery. The Earth Gallery is a library of modifications of Google Earth people have made. In the library there are not only modifications for 3D buildings, soft Also models of earthquakes using the Google Earth model, 3D Forests, and much more. 
Recently [When?], Google added a feature That Allows users to monitor traffic speeds at loops Located Every 200 yards in real-time. In 2007 Google Began Offering data traffic in real-time, crowdsourced based on information from the GPS-Identified locations of cellular phone users.  In version 4.3 released on April 15, 2008 Google Street View Fully Integrated Into Was the program allowing the program to Provide an on the street level view in Many locations. 
On January 31, 2010, the entirety of Google Earth’s ocean floor imagery Was updated to new images by SIO, NOAA, US Navy, BY, and GEBCO. The new images have caused smaller islands, atolls Some Such as in the Maldives, rendered invisible to swear on Despite being Completely outlined developer’s shores.
Google Earth May Be Used To Perform some day-to-day tasks and for other Purposes.
Google Earth Can Be used to view Widespread Disasters Areas subjected to f Google supplies up-to-date images. For example, after the January 12, 2010 Haiti Earthquake images of Haiti Were made available on January 17.
With Google’s push for the inclusion of Google Earth in the Classroom  teachers are adopting Google Earth in the classroom for lesson planning, Such as teaching students Geographical themes (location, culture, characteristics, human interaction, and movement)  to Creating mashups with other web applications Such as Wikipedia.  
One Can explore and place bookmarks location on the Moon and Mars.
One Can get directions using Google Earth, using variables Such as street names, cities, and establishments. But the addresses must by typed in the search field, one can’t simply click on two spots on the map.
Google Earth Can function as a hub of knowledge, pertaining the users location. By Enabling CERTAIN options, ONE CAN see the location of gas stations, Restaurants, Museums, and other public establishments in Their area. Google Earth Can Also dot the map with links to images, YouTube videos, Wikipedia articles and relevant to the area being viewed.
One image Can create custom overlays for Planning trips, hikes on handheld GPS units.
Google Earth Can Be used to map homes and select a random sample for research in Developing Countries. 
All of These features are Also released by Google Earth Blog.
In December 2006 Google Earth added a new layer called “Geographic Web” That Includes integration with Wikipedia and Panoramio. In Wikipedia, entries are scraped for coordinates via the COORD templates. Also there is a community-layer from the project Wikipedia-World. More coordinates are used, different types are in the display and Different languages are supported than the built-in Wikipedia layer.   Google Announced on May 30, 2007 That it is Acquiring Panoramio.  In March 2010, Google removed the “Geographic Web” layer. The “Panoramio” layer became part of the main layers and the “Wikipedia” layer Was placed in the “More” layer.
Google Sky is a feature That Was Introduced in Google Earth 4.2 on August 22, 2007 and Allows users to view stars and other celestial bodies.  Was it produced by Google through a partnership with the Space Telescope Science Institute (STScI) in Baltimore, the science operations center for the Hubble Space Telescope. Dr. Alberto Conti and his co-developer Dr. Carol Christian of STScI plan to add the public images from 2007,  as well as color images of all of the Archived data from Hubble’s Advanced Camera for Surveys. Newly released Hubble pictures Will Be added to the Google Sky program as soon as They are issued. New features Such as multi-wavelength data, positions of major satellites and Their orbits as well as Educational Resources Will Be Provided to the Google Earth community and Also through Christian and Conti’s website for Sky.  Also visible on Sky mode are constellations, stars, galaxies and animations depicting the planets in orbits of developer. A real-time Google Sky mashup of recent astronomical transients, using the VOEvent protocol, is being Provided by the VOEventNet  collaboration. Google’s Earth maps are being updated Each 5 minutes.
Google Sky faces competition  from Microsoft WorldWide Telescope (Which runs only under the Microsoft Windows operating systems) and from Stellarium, a free open source planetarium That runs under Microsoft Windows, OS X, and Linux.
On March 13, 2008 Google made a web-based version  of Google Sky available via the internet.
On April 15, 2008 with version 4.3, Google fully Integrated Into Its Street View Google Earth. In version 6.0, the photo has been removed zooming function Because it is incompatible with the new ‘seamless’ navigation.
Google Street View Provides 360 ° panoramic street-level views and Allows users to view parts of selected cities and surrounding metropolitan Areas of developer at ground level. When It Was Launched on May 25, 2007 for Google Maps, only five cities Were Included. We have SINCE Expanded to more than 40 U.S. cities, and Includes the Suburbs of Many, and in Some Cases, other nearby cities. Recent updates have now Implemented Street View in Most of the major cities of Canada, Mexico, Denmark, South Africa, Japan, Spain, Norway, Finland, Sweden, France, the UK, Republic of Ireland, the Netherlands, Italy, Switzerland, Portugal , Taiwan, and Singapore.
Google Street View, When operated, displays photos That Were Previously Taken by a camera mounted on an automobile, and Can Be navigated by using the mouse to click on photograph icons Displayed on the screen in the user’s direction of travel. Using These devices, the photos Can Be viewed in different sizes, from any direction, and from a variety of angles.
Introduced in version 5.0 (February 2009), the Google Ocean feature Allows users to zoom below the surface of the ocean and view the 3D bathymetry beneath the waves. Supporting over 20 content layers, it contains information from leading scientists and oceanographers.  On April 14th, 2009, Google added underwater terrain data for the Great Lakes.  In 2010, Google added underwater terrain data for Lake Baikal.
In June 2011, the Higher resolution of deep ocean floor Some Areas increased in focus from 1-kilometer grids to 100 Meters thanks to a new synthesis of seafloor topography released through Google Earth.  The high-resolution features Were developed by oceanographers at Columbia University’s Lamont-Doherty Earth Observatory from scientific data collected on research cruises. The sharper focus is available for about 5 Percent of the oceans (an area larger than North America). Can Be seen underwater scenery of the Hudson Canyon off New York City, the Wini Seamount near Hawaii, and the sharp-edged 10,000-foot-high Mendocino Ridge off the Pacific Coast U.S. There is a Google 2011 Seafloor Tour for Those Interested in viewing terrain deep ocean