Google Earth

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Google Earth
Google Earth.svg
Developer(s) Google
Initial release June 2005 (as Google Earth)
circa 2001 (as EarthViewer)
Stable release 5.0.11733.9347 / 2009-05-05; 4 years ago
Operating system Windows 2000, XP & Vista, Mac OS X, iPhone OS, Linux
Size 10 MB (8.9 MB iPhone; 24 MB Linux; 35 MB Mac )
Language 41 languages, see the full list
Type Virtual globe
License Freeware/Proprietary
Website http://earth.google.com/

Google Earth is a virtual globe, map and geographic information program that was originally called Earth Viewer, and was created by Keyhole, Inc, a company acquired by Google in 2004. It maps the Earth by the superimposition of images obtained from satellite imagery, aerial photography and GIS 3D globe. It is available under three different licenses: Google Earth, a free version with limited functionality; Google Earth Plus (discontinued)[1][2], which included additional features; and Google Earth Pro ($400 per year), which is intended for commercial use.[3]


The product, re-released as Google Earth in 2005, is currently available for use on personal computers running Microsoft Windows 2000, XP, Vista, 7, Mac OS X 10.3.9 and above, Linux (released on June 12, 2006), and FreeBSD. Google Earth is also available as a browser plug-in (released on June 2, 2008) for Firefox 3[4], Safari 3, IE6 and IE7. It was also made available on the iPhone OS on October 27 2008, as a free download from the App 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. The release of Google Earth in June 2005 to the public caused a more than tenfold increase in media coverage on virtual globes between 2005 and 2006,[5] driving public interest in geospatial technologies and applications.

Contents

[edit] Overview

A rendering of the Flatirons in Boulder, Colorado by Google Earth


Google Earth displays satellite images of varying resolution of the Earth's surface, allowing users to visually see things like cities and houses looking perpendicularly down or at an oblique angle, with perspective (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.[6] Melbourne, Victoria; Las Vegas, Nevada; and Cambridge, Cambridgeshire 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 objects which are horizontally far away are seen smaller, but of course it is 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).[citation needed] This means one can view the Grand Canyon or Mount Everest in three dimensions, instead of 2D like other areas. Since November 2006, the 3D views of many mountains, including Mount Everest, have been improved by the use of supplementary DEM data to fill the gaps in SRTM coverage.[7]

Many people use the applications to add their own data, making them available through various sources, such as the Bulletin Board Systems (BBS) or blogs mentioned in the link section below. Google Earth is able to show all kinds of images overlaid on the surface of the earth and is also a Web Map Service client. Google Earth supports managing three-dimensional Geospatial data through Keyhole Markup Language (KML).

Google Earth has the capability to show 3D buildings and structures (such as bridges), which consist of users' submissions using SketchUp, a 3D modeling program. 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, Ireland, India, Japan, United Kingdom,[8] Germany, Pakistan and the cities, Amsterdam and Alexandria.[9] In August 2007, Hamburg became the first city entirely shown in 3D, including textures such as façades. The Irish town of Westport was added to Google Earth in 3D on January 16, 2008. The 'Westport3D' model was 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 their town planning functions it includes the highest resolution photo-realistic textures to be found anywhere in Google Earth. Three-dimensional renderings are available for certain buildings and structures around the world via Google's 3D Warehouse[10] and other websites.

Recently, Google added a feature that allows users to monitor traffic speeds at loops located every 200 yards in real-time. In version 4.3 released on April 15, 2008, Google Street View was fully integrated into the program allowing the program to provide an on the street level view in many locations.

On January 17, 2009, the entirety of Google Earth's ocean floor imagery was updated to new images by SIO, NOAA, US Navy, NGA, and GEBCO. The new images have caused smaller islands, such as some atolls in the Maldives, to be rendered invisible despite their shores being completely outlined.[11]

[edit] Languages

Since version 5.0 Google Earth is available in 38 languages (four of which in two variants):

  • Arabic
  • Bulgarian
  • Catalan
  • Chinese (Traditional)
  • Chinese (Simplified)
  • Croatian
  • Czech
  • Danish
  • Dutch
  • English (American)
  • English (Britain)
  • Filipino
  • Finnish
  • French
  • German
  • Greek
  • Hebrew
  • Hindi
  • Hungarian
  • Indonesian
  • Italian
  • Japanese
  • Korean
  • Latvian
  • Lithuanian
  • Norwegian
  • Polish
  • Portuguese (Portugal)
  • Portuguese (Brazil)
  • Romanian
  • Russian
  • Serbian
  • Slovak
  • Slovenian
  • Spanish (Spain)
  • Spanish (Latin America)
  • Swedish
  • Thai
  • Turkish
  • Ukranian
  • Vietnamese

[edit] Features

[edit] Wikipedia and Panoramio integration

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. There is also 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. See: *dynamic resp. static layer. Google announced on May 30, 2007 that it is acquiring Panoramio.[12]

[edit] Flight simulator

Downtown Toronto, as seen from a F16 Fighting Falcon during a simulated flight.

Since Google Earth v4.2, a flight simulator has been included as a hidden feature. Depending on the system, it can be accessed by pressing Control+Alt+A, Control+A, or Command+Option+A. After this feature has been activated at least once it appears under the tools menu. Since v4.3 the option is no longer hidden by default. Currently the F-16 Fighting Falcon and the Cirrus SR-22 are the only aircraft that can be used, in addition to a few airports.[13] It is also possible to control the simulator with a mouse or joystick, although not all models are currently supported.

The Google Earth flight simulator features the ability to fly to any supported locations of the world. The pilot can choose any location to start a flight or attempt to land a flight in the world. Fly time is not very accelerated, as it takes the F-16 at highest speed at least 60 minutes to fly from coast-to-coast in the US. Aircraft can land on any level surface in the world (including under the ocean in Google Earth 5.0) as long as the aircraft is below 250 knots and is falling at less than 2,000ft per minute when touching ground.

[edit] Featured planes

[edit] Sky mode

Google Earth in Sky Viewing Mode in Windows Vista

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.[14] It was 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,[15] 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 their orbits. 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[16] from Microsoft WorldWide Telescope (which runs only under the Microsoft Windows operating systems) and from Stellarium (computer program), a free open source planetarium that runs under Microsoft Windows, Mac OS X, and Linux.

On March 13, 2008 Google made a web-based version of Google Sky available at http://www.google.com/sky/.

[edit] Street View

On April 15, 2008 with version 4.3, Google fully integrated its Street View into Google Earth.

Google Street View provides 360° panoramic street-level views and allows users to view parts of selected cities and their surrounding metropolitan areas at ground level. When it was launched on May 25, 2007 for Google Maps, only five cities were included. It has since expanded to more than 40 U.S. cities, and includes the suburbs of many, and in some cases, other nearby cities. A recent update has now implemented Street View in most of the major cities of Australia and New Zealand as well as parts of Japan, Spain, France, the UK, the Netherlands and Italy.

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 your direction of travel. Using these devices, the photos can be viewed in different sizes, from any direction, and from a variety of angles.

[edit] Ocean

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.[17] On April 14, 2009, Google added underwater terrain data for the Great Lakes. [18]

[edit] Historical Imagery

Introduced in version 5.0, Historical Imagery allows users to traverse back in time and study earlier stages of any place. This feature is very useful for research purposes that require analysis of past records of various places.[19]

[edit] Mars

A High Resolution View of Victoria Crater Displayed in 3D using the Mars feature on Google Earth 5

Google Earth 5 includes a separate globe of the planet Mars, that can be viewed and analysed for research purposes. The maps are of a much higher resolution than those on the browser version of Google Mars and it also includes 3D renderings of the Martian terrain. There are also some extremely high resolution images from the Mars Reconnaissance Orbiter's HiRISE camera that are of a similar resolution to those of the cities on Earth. Finally, there are many high resolution panoramic images from various Mars landers, such as the Mars Exploration Rovers, Spirit and Opportunity, that can be viewed in a similar way to Google Street View. Interestingly enough, layers on Google Earth (such as World Population Density) can also be applied to Mars. Layers of Mars can also be applied onto Earth.

[edit] Influences

The Google Earth interface bears a noted similarity to the ‘Earth’ program described in Neal Stephenson’s sci-fi classic Snow Crash. Indeed, a Google Earth co-founder claimed that Google Earth was modeled after Snow Crash, [20] while another co-founder said it was inspired by the short science education film Powers of Ten.[21] In fact Google Earth was at least partly inspired by a Silicon Graphics demo called "From Space to in Your Face" which zoomed from space into the Swiss Alps then into the Matterhorn[22]. This launch demo was hosted by an Onyx 3000 with InfiniteReality4[23] graphics, which supported Clip Mapping and was inspired by the hardware texture paging capability (although it did not use the Clip Mapping) and "Powers of Ten". The first Google Earth implementation called Earth Viewer emerged from Intrinsic Graphics as a demonstration of Chris Tanner's software based implementation of a Clip Mapping texture paging system and was spun off as Keyhole Inc. Earth Viewer was the inevitable ultimate realization of the capabilities of a seamless texture paging system and many of the individuals working on Earth Viewer were Silicon Graphics alumni.

[edit] Technical Specifications

Detailed release notes/history/changelog are made available by Google.[24]

[edit] Imagery and coordination

[edit] Hardware and software

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 warn the user if their graphics card is not able to support Earth (this often occurs due to insufficient Video RAM or buggy graphics card drivers). The next most likely mode of failure is Internet access speed. Except for the very patient, broadband Internet (Cable, DSL, T1, etc.) is required.

[edit] Linux Specifications

Minimum System Requirements[26]
  • Ubuntu 5.10 or later
  • SUSE 10.1 or later
  • Fedora Core 4 or later
  • Linspire 5.1
  • Gentoo 2006.0
  • Debian 3.1/4
  • Red Hat 9
  • Slackware 11.0
  • FreeBSD 6.1/7.0 with Linux Emulation
  • Linux 0.7.2 Duke
  • Xandros 3.0.3 Business Edition
  • Mandriva 2007
  • Sabayon Linux 3.26
  • PCLinuxOS 5.0

[edit] Web browsing

As of Google Earth 5, the contents of description balloons, which are created in KML using JavaScript and iFrames, are rendered with an embedded WebKit engine[27].

[edit] Versions and variations

[edit] Release timeline

[edit] Mac 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 on December 8, 2005. The leaked version was significantly incomplete. Among other things, neither the Help menu nor its "Display License" feature worked, indicating that this version was intended for Google's internal use only. Google released no statement regarding the leak.

The Mac version runs only under Mac OS X version 10.4 or later. There is no embedded browser, no direct interface to Gmail and no full screen option. As of January 2009 there are a few bugs concerning the menu bar when switching between applications and a few bugs concerning annotation balloons and printing.

From version 4.1.7076.4558 (released on May 9, 2007) onward Mac OS X users can, among other new features, upgrade to the "Plus" version via an option in the Google Earth menu.[28] Some users reported difficulties with Google Earth crashing in the then current version when zooming in.[29]

[edit] Linux version

Starting with the version 4 beta Google Earth functions under Linux, as a native port using the Qt-toolkit. A Linux portable version is also available[30].It is proprietary software specifically in order to impose Digital Rights Management[citation needed]; the Free Software Foundation consider the development of a free compatible client for Google Earth to be a High Priority Free Software Project.[31]

[edit] iPhone OS version

A version for the iPhone OS (which runs on both the iPhone and iPod Touch) was released for free on the App Store on October 27, 2008[32][33]. It makes use of the multi-touch interface to move on the globe, zoom or rotate the view, and allow to select the current location using the iPhone integrated Assisted GPS. This version, however, does not feature layers like computer versions do. Like Google Maps, it only integrates the Wikipedia and Panoramio layers. [34]

[edit] Google Earth Plus

Discontinued in December 2008, Google Earth Plus was an individual-oriented paid subscription upgrade to Google Earth that provided customers with the following features, most of which are now available in the free Google Earth:

[edit] Google Earth Pro

For a $400 annual subscription fee, Google Earth Pro is a business-oriented upgrade to Google Earth that has more features than the Plus version. The Pro version includes add-on software such as:

Originally, these features cost extra in addition to the $400 fee, but more recently have been included in the package.

Unlike the free version of Google Earth, the professional version does not work on Linux.

[edit] Google Earth Enterprise

Google Earth Enterprise is a version of Google Earth designed for use by organizations whose business could take advantage of the program's capabilities.[35]

[edit] Portable version

A portable version of Google Earth, made with VMware ThinApp is available.[36]. A Portable version for Linux is also available, using the RUNZ format.

[edit] Google Earth Plug-in

The Google Earth API is a free beta service, available for any web site that is free to consumers. The Plug-in and its JavaScript API allows users to place a version of Google Earth into web pages. The API does not have all the features of the full Google Earth Application but still allows you to build sophisticated 3D map applications.

The Google Earth Plug-in is currently available for the following web browsers and operating systems:

Microsoft Windows (2000, XP, and Vista)

Apple Mac OS X 10.4 and higher (Intel and PowerPC)

To date the plug-in supports the following layers:

It also supports 'Sky Mode', 'Photo Overlays', and provides much of the same controls and information bar as the full application.

[edit] Resolution and accuracy

The Isles of Scilly, showing the very low resolution of some islands. The islands (green area) are about 10 km across. (This is now improved.)49°56′10.81″N 6°19′22.88″W / 49.9363361°N 6.3230222°W / 49.9363361; -6.3230222 (Low resolution Isles of Scilly)
The west side of Gibraltar, tilted view showing the sea rising up the Rock of Gibraltar - claimed altitude of the sea just off the beach at Elliots Memorial, 252 m. This is now fixed. 36°6′59.6″N 5°21′5.2″W / 36.116556°N 5.351444°W / 36.116556; -5.351444 (Water altitude problem in Google Earth)

Most land areas are covered in satellite imagery with a resolution of about 15 m per pixel. This base imagery is 30m multispectral Landsat which is pansharpened with the 15m [panchromatic] Landsat imagery. However, Google is actively replacing this base imagery with 2.5m SPOTImage imagery and several higher resolution datasets mentioned below. Some population centers are also covered by aircraft imagery (orthophotography) with several pixels per meter. Oceans are covered at a much lower resolution, as are a number of islands; notably, the Isles of Scilly off southwest England, were at a resolution of about 500 m or less, however this has now been addressed.

Google has resolved many inaccuracies in the vector mapping since the original public release of the software, without requiring an update to the program itself. An example of this was the absence from Google Earth's map boundaries of the Nunavut territory in Canada, a territory that had been created on April 1, 1999; this mistake was corrected by one of the data updates in early 2006. Recent updates have also increased the coverage of detailed aerial photography, particularly in certain areas of western and central Europe.

The images are not all taken at the same time, but are generally current to within three years. However with the release of Google Earth 5.0, it has historical images dating back to the 1940s in some spots. Image sets are sometimes not correctly stitched together. Updates to the photographic database can occasionally be noticed when drastic changes take place in the appearance of the landscape, for example Google Earth's incomplete updates of New Orleans following Hurricane Katrina, or when placemarks appear to shift unexpectedly across the Earth's surface. Though the placemarks have not in fact moved, the imagery is composed and stitched differently. Such an update to London's photography in early 2006 created shifts of 15-20 metres in many areas, noticeable because the resolution is so high.

Place name and road detail vary greatly from place to place. They are most accurate in North America and Europe, but regular mapping updates are improving coverage elsewhere.

Errors sometimes occur due to the technology used to measure the height of terrain; for example, tall buildings in Adelaide cause one part of the city to be rendered as a small mountain, when it is in fact flat. The height of the Eiffel Tower creates a similar effect in the rendering of Paris. Also, prior to the release of version 5.0 in February 2009, elevations below sea level were presented as sea level, for example: Salton City, California; Death Valley; and the Dead Sea were all listed as 0 m when Salton City is −38 m; Death Valley is −86 m; and the Dead Sea is −420 m.

Where no 3 arc second digital elevation data was available, the three dimensional images covering some areas of high relief are not at all accurate, but most mountain areas are now well mapped. The underlying digital elevation model has been placed 3 arc seconds too far north and up to 3 arc seconds too far west. This means that some steep mountain ridges incorrectly appear to have shadows extending over onto their south facing sides. Some high resolution images have also been misplaced, an example is the image covering Annapurna, which is misplaced by about 12 arc seconds. Elevation data was recently updated to 10-meter (1/3-arc-second) resolution for much of the United States from the previous 30-meter (1-arc-second) resolution.

The "Measure" function shows that the length of equator is about 40,030.24 km, giving an error of −0.112% compared with the actual value of 40,075.02 km Earth; for the meridional circumference, it shows a length of about 39,963.13 km, also giving an error of −0.112% compared with the actual value of 40,007.86 km.

On December 16, 2007, most of Antarctica was updated to a 15 m resolution using imagery from the Landsat Image Mosaic of Australia; (1m resolution images of some parts of Antarctica were added in June 2007); however, the Arctic polar ice cap is completely absent from the current version of Google Earth, as are waves in the oceans. The geographic North Pole is found hovering over the Arctic Ocean and the tiling system produces artifacts near the poles as the tiles become 'infinitely' small and rounding errors accumulate.

Cloud cover and shadows can make it difficult or impossible to see details in some land areas, including the shadow side of mountains.

[edit] Google Earth Community

The Google Earth Community is an online forum[37] which is dedicated to producing 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 others to download; as long as you have an account.

The Google Earth Community was offline from January 12 to January 15 for site maintenance.[38] When put back up, the site appeared to be redesigned. Even so, many old file links were broken, preventing most content from being downloaded. On January 19, however, a user named "Ink_polaroid" rewrote the coding in the links to work for the new site format, making all files viewable.[39]

[edit] Controversy/Criticism

The software has been criticized by a number of special interest 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:

Blurred out image of the Royal Stables in The Hague, Netherlands.

Some citizens may express concerns over aerial information depicting their properties and residences being disseminated freely. As relatively few jurisdictions actually guarantee the individual's right to privacy, as opposed to the state's right to secrecy, this is an evolving, but minor, point. Perhaps aware of these critiques[52], for a time, Google had Area 51 (which is highly visible and easy to find) in Nevada as a default placemark when Google Earth is first installed.

As a result of pressure from the United States government, the residence of the Vice President at Number One Observatory Circle was obscured through pixelization in Google Earth and Google Maps, but has since been lifted. The usefulness of this downgrade is questionable, as high-resolution photos and aerial surveys of the property are readily available on the Internet elsewhere.[53] Capitol Hill used to also be pixelized in this way but this was lifted.

Critics have expressed concern over the willingness of Google to cripple their dataset to cater to special interests, believing that intentionally obscuring any land goes against its stated goal of letting the user "point and zoom to any place on the planet that you want to explore".[54]

Recent versions of Google Earth software require a running in the background software that will automatically download and install updates. Several users expressed concerns as there is not an easy way to disable that. [55]

[edit] Copyright

Currently, every image created from Google Earth using satellite data provided by Google Earth is a copyrighted map. Any derivative from Google Earth is made from copyrighted data which, under United States Copyright Law, may not be used except under the licenses Google provides. Google allows non-commercial personal use of the images (e.g. on a personal website or blog) as long as copyrights and attributions are preserved.[56] By contrast, images created with NASA's globe software World Wind use the Blue Marble, Landsat or USGS layer, each of which is a terrain layer in the public domain. Works created by an agency of the United States government are public domain at the moment of creation. This means that those images can be freely modified, redistributed and used for commercial purposes.

[edit] Layers

Google Earth also features many layers as a source for information on businesses and points of interest, as well as showcasing the contents of many communities, such as Wikipedia, Panoramio and YouTube. Google updates with new layers often. Many Google Earth layers, such as Panoramio and Google Earth Community layers, are updated daily with entries from the respective websites.

[edit] Geographic Web

[edit] Roads

Displays available road networks. The colors and signs displayed vary depending on the type of roadway.

[edit] 3D Buildings

Shows many 3D buildings in major cities, such as New York City or Hong Kong, in these styles:

[edit] Google Street View

Shows placemarks with 360 degree panoramic views of streets of many cities in Australia, Canada, France, Italy, Japan, New Zealand, Spain, the United States, and recently the United Kingdom, and The Netherlands.

[edit] Borders and labels

Contains borders for countries/provinces and shows placemarks for cities and towns.

[edit] Traffic

Displays colored indicators along those roads where real time traffic conditions are measured. Green indicators are used for good traffic conditions, yellow for slower speeds, and red for poor traffic conditions. By clicking on an indicator, the user can see the name of the road and the speed along that road. It is not clear with what frequency the indicators are updated.

[edit] Weather

[edit] Gallery

[edit] Ocean

[edit] Global Awareness

A collection of services spreading global awareness. The layer was provided by Google Earth Outreach.

[edit] Places of Interest

A collection of business listings provided by many local services.

[edit] Sky Layers

Layers for Google Sky.

[edit] Mars Layers

[edit] See also

[edit] Image providers

[edit] References

  1. "Google Earth Plus Discontinued". http://www.gearthblog.com/blog/archives/2008/12/google_earth_plus_discontinued.html. 
  2. "Google Discontinues “Google Earth Plus”". http://www.techpluto.com/google-earth-live/. 
  3. "Google Earth Product Family". http://earth.google.com/products.html. Retrieved 2007-08-05. 
  4. "Google Earth Plugin Now Runs in Firefox 3". http://www.gearthblog.com/blog/archives/2008/06/google_earth_plugin_now_runs_in_fir.html. 
  5. "Media Coverage of Geospatial Platforms". http://www.geospatialweb.com/figure-4. Retrieved 2007-08-05. 
  6. Google Earth Coverage: Maps showing a visual representation of Google Earth coverage
  7. "Google Earth Community: Nov. 23rd - Thanksgiving Day imagery update". http://bbs.keyhole.com/ubb/showthreaded.php/Cat/0/Number/695033/an/latest/page/0#695033. 
  8. Skyscraper News Google Earth
  9. infopot.tk
  10. 3D Warehouse
  11. http://www.gearthblog.com/blog/archives/2009/01/new_view_of_ocean_floor_in_google_e.html
  12. "Google is planning to acquire Panoramio". google.com. http://www.google.com/intl/en/press/annc/annc_panoramio.html. 
  13. Marco's Blog: Google Earth Flight Simulator
  14. "Explore the sky with Google Earth". Google. 2007-08-22. http://earth.google.com/sky/skyedu.html. Retrieved 2007-08-22. 
  15. Celestial add-on points Google Earth at the stars - tech - August 22, 2007 - New Scientist Tech
  16. http://crave.cnet.com/8301-1_105-9881229-1.html
  17. http://news.bbc.co.uk/1/hi/technology/7865407.stm
  18. "Google Earth now includes US "Third Coast"". http://google-latlong.blogspot.com/2009/04/google-earth-now-includes-us-third.html. 
  19. "Dive into New Google Earth". http://googleblog.blogspot.com/2009/02/dive-into-new-google-earth.html. Retrieved 2009-02-03. 
  20. Web User - Google Earth interview
  21. Avi Bar-Ze’ev (from Keyhole, the precursor to Google Earth) on origin of Google Earth
  22. Google Earth: From Space to Your Face…and Beyond
  23. Infinite Reality Technical Report
  24. Google Earth Release Notes / Changelog History
  25. Google Earth
  26. Google Earth
  27. [http://code.google.com/apis/kml/documentation/kmlreference.html#description KML Reference Documentation - <description> ]
  28. "Google Earth 4.2.180.1134 - MacUpdate". http://www.macupdate.com/info.php/id/20124. 
  29. "Google Earth Community: Viewing forum: Google Earth for Mac OS X". http://bbs.keyhole.com/ubb/postlist.php/Cat/0/Board/SupportGEMac. 
  30. Portable Apps for Linux
  31. [1]:FSF:High Priority Free Software Projects
  32. Sorrel, Charlie (2008-10-27). "Google Earth Comes to the iPhone". wired.com. http://blog.wired.com/gadgets/2008/10/google-earth-co.html. Retrieved 2008-10-27. 
  33. "Google Earth now available for the iPhone". google mobile team. 2008-10-27. http://googlemobile.blogspot.com/2008/10/google-earth-now-available-for-iphone.html. Retrieved 2008-10-27. 
  34. http://www.gearthblog.com/blog/archives/2008/10/google_earth_for_the_iphone_release.html
  35. http://earth.google.com/enterprise/earth_enterprise.html
  36. Portable Applications (Windows)
  37. Google Earth Community: Viewing list of forums
  38. http://www.gearthblog.com/blog/archives/2009/01/google_earth_community_forums_unava.html
  39. http://www.gearthblog.com/blog/archives/2009/01/google_earth_community_forums_bbs_i.html
  40. "Kalam Concerned Over Google Earth". http://www.techtree.com/techtree/jsp/article.jsp?article_id=68712&cat_id=582. Retrieved 2007-01-25. 
  41. ""Google Earth agrees to blur pix of key Indian sites"". http://timesofindia.indiatimes.com/Google_Earth_agrees_to_blur_pix_of_key_Indian_sites/articleshow/1559236.cms. 
  42. ""Google Earth Poses Security Threat to India, ISRO Chief seeks Dialogue"". http://www.techshout.com/internet/2006/10/google-earth-poses-security-threat-to-india-isro-chief-seeks-dialogue/. Retrieved 2007-01-25. 
  43. ""Google Earth images compromise secret installations in S. Korea"". http://www.worldtribune.com/worldtribune/TEMP/ea_skorea_09_06.html. Retrieved 2007-01-25. 
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  58. 58.0 58.1 58.2 58.3 Google Earth: Weather layer, information link -- accessed: 03 March 2009 v5.0.11337.1968 (beta)

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