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Google Earth is a free-of-charge, downloadable Virtual Globe program. It maps the entire earth by pasting images obtained from Satellite Imagery , Aerial Photography and GIS over a 3D globe. OVERVIEW Formerly known as Earth Viewer, Google Earth was developed by Keyhole, Inc. Google acquired that company in 2004 . The product was renamed Google Earth in 2005 and is currently available for use on Personal Computer s running Mac OS X 10.3.9 and above, and Microsoft Windows 2000 or XP. A Linux version has been announced for 2006. In addition to releasing an updated Keyhole based client Google also added the satellite imagery from the Earth database to their web based mapping software. Many large cities are available in high enough resolution to see individual buildings, houses, and even cars. The degree of resolution available is based somewhat on the points of interest, but most places are available at at least 15 meters of resolution. Google Earth allows users to search for addresses (for the USA, Canada, and UK only), enter coordinates, or simply use the mouse to browse to a location. Google Earth also has Digital Terrain Model data collected by NASA 's Shuttle Radar Topography Mission . This means one can view the Grand Canyon or Mount Everest in three Dimension s, instead of 2D like other map progams/sites. In addition, Google has provided a layer allowing one to see 3D Buildings for some of the major cities in the US. Many people using the applications are adding their own data and making them available through various sources such as the BBS or blogs mentioned in the link section below. Google Earth is available in a free version, and in licensed versions for commercial use. It is currently officially available on Windows XP and Mac OS X . The Linux version, which was expected to be released in 2005, has been announced to be released in mid 2006. A leaked version of working non-public beta of Google Earth for Mac OS X started to appear on the internet on December 8 2005 . When started up, Google Earth's view is centered on Lawrence, Kansas . The director of engineering for Google Earth is Brian McClendon , whose online biography says he is a 1986 graduate of the University Of Kansas . {Link without Title} See also KML (Keyhole Markup Language). 3D BUILDINGS illustrating some of Google Earth's capabilities]] A feature implemented by Google after its acquisition of Keyhole is a 3D dataset for (as of December 2005) 39 cities. This data is provided by Sanborn Citysets . This feature is limited to displaying grey overlaying "blocky" buildings. On March 14, 2006, Google aquired @Last Software, makers of SketchUp , who had created a plugin for 3d renderings in Google Earth. The cities currently included are: New York City (Manhattan below Central Park and West Brooklyn), Chicago (the Loop, near Magnificent Mile, and residential areas north, south, and just west of those areas along the lake), Los Angeles (downtown, areas along the Miracle Mile, Wilshire Blvd), Honolulu (downtown and along the beach), San Francisco (the northeastern quadrant), Philadelphia (downtown and residential areas to the south and west), Houston (downtown), Washington , Boston , Dallas , Minneapolis , Saint Paul , Miami , Atlanta , Denver , Seattle , Detroit (downtown), Arlington , Baltimore , St. Louis (downtown), Pittsburgh , Cleveland , San Diego , Long Beach , Sacramento , Cincinnati , Tampa , Fort Lauderdale , New Orleans , Kansas City , Buffalo , Portland , Las Vegas , Jersey City (along the Hudson River ), Newark , Memphis , Phoenix , and St. Petersburg, Florida, USA . However, 3D buildings are available for certain buildings around the world using programs from other websites. SPECIFICATIONS
Google Earth is unlikely to operate on older hardware configurations. The most recent downloads available document these minimum configurations:
The most likely mode of failure is insufficient video RAM: the software is designed to declare failure if 16 MB of video RAM is not available. The next most likely mode of failure is Internet access speed. Except for the very patient, Broadband Internet (Cable, DSL, T1, etc.) is required. Again, resolution is not uniform, some towns such as St Petersburg are only partially available in high-resolution. Compare the resolution of these older B&W data:
versus what is currently available with Google Earth in color: In this case, the TerraServer-USA data can identify individual trees but its data is structured in cumbersome tiles. As with much GIS data, the utility of the data is application-dependent for the purpose of determining if resolution is sufficient. Also note that from a usability point of view, TerraServer loses its center point when one zooms in and out where Google Earth browsing is smooth; a clear benefit, but at the price of the somewhat demanding requirements imposed upon the video card. MAC OS X VERSION A version for Mac OS X was released on January 10 2006 , and is available for download from the Google Earth website. With a few exceptions noted below, the Mac version appears to be stable and complete, with virtually all the same functionality as the original Windows version. Screenshots and an actual binary of the Mac version had been leaked to the internet a month previously, on December 8 2005 . The leaked version was significantly incomplete. Among other things, neither the Help menu nor its "Display License" feature worked, a pretty sure sign that the version was intended for Google's internal use only. Google released no statement regarding the leak. Currently, the Mac version runs only under Mac OS version 10.4 and 10.3.9. There are no "Plus" or "Pro" versions. There is no embedded browser and no direct interface to Gmail. Fullscreen mode does not work. There are a few bugs concerning the menu bar when switching between applications. There are a few bugs concerning annotation balloons and printing. The latest version is 3.1.0621.0 released on 2006-04-21 {Link without Title} . ACCURACY Most land areas are covered in satellite imagery with a resolution of about 15 m per pixel, and some population centers are also covered in airplane imagery of several pixels per meter. Oceans are covered in much lower resolution. Due to the limited spatial resolution of the altitude map, altitudes are often inaccurate, especially the altitude of small features, like mountain tops; e.g. Mount Everest 's height is short by 253 m, and the sea near Gibraltar is shown with an altitude of 252 m. Unlike the satellite images, the plane images have a Perspective from close to the surface, leading to distortions when used in a mosaic. Tall buildings sometimes appear to be leaning towards each other (conspicuous in e.g. Chicago at South Clark Street, in the middle of downtown; or near the Empire State Building in New York City ). The Fatih Sultan Mehmet Bridge on the Bosporus may be another example of this effect. An inaccuracy of the current edition (version 3.0.0762, build date November 17 2005 ) was that the territory of Nunavut in Canada - an area comparable in size to Western Europe - was notably absent. Google Earth's map boundaries of Northern Canada showed only the Northwest Territories , not the division of Nunavut created on April 1 1999 . This inaccuracy has however been corrected since then, probably in one of the data updates during the first months of 2006 . The Space Needle in Seattle is particularly distorted, bearing no resemblance whatsoever to the actual Space Needle. Place name and road detail vary greatly from place to place, and are most accurate in the USA and Europe, though misplaced name tags have been found there too, e.g. the name tags for Newcastle Upon Tyne and Gateshead are both about 2 km north of their correct positions. Also, the North and South Poles are marked as 89°59'60" N and 89°59'60" S respectively, rather than the correct 90°00'00" N and 90°00'00" S. The images are not all taken at the same time, but are generally current to within three years. Image sets are sometimes not correctly stitched together. CRITICISMS US bias The software, in particular the search engine, is criticized for its US-bias; for example, entering in searches for "Birmingham" and for "St. Petersburg" bring up US cities, as opposed to the original and larger cities of those names (in the UK and Russia respectively). Although major cities throughout the world, such as Delhi , London , Rome , Berlin , Beijing , Toronto , and Sydney to name a few can just be typed into the search bar without the country name, most places outside of the US cannot be found with the search function unless the country name is added and written out in full (except for "UK" and "MX"), while there are many easier paths to find data for US locations. The default setting is to U.S. Customary Units , despite Metric Units being the international standard officially adopted by every nation but 3 (the U.S, Liberia , and Myanmar , although Liberia and Myanmar use it in practice), leading to accusations of Cultural Imperialism . However the units can be changed. The 3D buildings feature is also limited at present to major US cities. However, defenders say that the majority of the Internet is US-focused, that Google itself is a US-based corporation, and that the majority of both Google and Google Earth users are American, so that Google Earth is simply reflecting a more general bias of the web. Although, the last three major image updates have focused on Paris , The United Kingdom and Germany . Google has also admitted problems with the software on systems using non-ASCII characters, for example Chinese or Japanese. {Link without Title} Naming disputes Google Earth, under "alternate place names," includes "Jerusalem" and "Yerushalayim" but neglects to include the Arabic name for the city, Al Quds. East Jerusalem has been occupied by Israel since 1967, in violation of UN resolutions and international law. (''see also: Positions On Jerusalem '') Jerusalem is listed by Google Earth exclusively as part of Israel, ignoring the fact that the status of East Jerusalem is disputed. Some South Korea n users have been angered by the fact that Google Earth and Google Maps use Japanese names for bays along the southeastern coast of the Korean Peninsula . Examples include bays near Busan (labelled Nakutogu Po and Kanrai ho), Masan (labelled Masan Ko, Kisan-ko, and Unchen Wan), and Goseong (labelled Kojo-wan, Toto wan, Nan Wan, and Toei kawan). The software was criticized by Taiwan ese users because the island was labelled as a province of Mainland China . This has since been changed, but the change has angered the People's Republic Of China {Link without Title} . A search for Tibet only works if you include China as a keyword, which angers people campaigning for the Chinese to cease their occupation of Tibet. [http://www.freetibet.org/press/pr250106.html Google Earth confuses towns in in Poland is incorrectly referred to as Hirschberg , whereas Görlitz on the west side of the border is called Zgorzelec , the name of its Polish neighbour. National security and privacy issues The software has been criticised by a number of groups, including national officials, as being an invasion of privacy and even posing a threat to national security. The typical argument is that the software provides information about military or other critical installations that could be used by Terrorists . The following is a selection of such concerns:
GOOGLE EARTH COMMUNITY An online forum {Link without Title} is dedicated to produce placemarks of interesting or educational perspectives. It may be found on the Google Earth webpage or under the Help section on the program itself. After downloading a placemark, it will automatically run Google Earth (if not opened), and fly to the area specified by the person who placed it. Once there, you can add it to your "My Places" by right clicking on the icon and selecting "Save to My Places". Additionally, anyone can post a placemark for anyone to download. GOOGLE EARTH PLUS Google Earth Plus is an individual-oriented paid upgrade to Google Earth and adds the following features:
GOOGLE EARTH PRO Google Earth Pro is a business-oriented paid upgrade to Google Earth that has more features than the "Plus" version. The Pro version is capable of running additional add-on software {Link without Title} . SEE ALSO
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