Google Earth Explained

Google Earth
Collapsible:yes
Ver Layout:stacked
Author:Keyhole, Inc.
Developer:Google
Programming Language:C++, Dart
Language Count:Various
Genre:Virtual globe
License:Freeware

Google Earth is a computer program that renders a 3D representation of Earth based primarily on satellite imagery. The program maps the Earth by superimposing satellite images, aerial photography, and GIS data onto a 3D globe, allowing users to see cities and landscapes from various angles. Users can explore the globe by entering addresses and coordinates, or by using a keyboard or mouse. The program can also be downloaded on a smartphone or tablet, using a touch screen or stylus to navigate. Users may use the program to add their own data using Keyhole Markup Language and upload them through various sources, such as forums or blogs. 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. In 2019, Google revealed that Google Earth now covers more than 97 percent of the world, and has captured 10 million miles of Street View imagery.[1]

In addition to Earth navigation, Google Earth provides a series of other tools through the desktop application, including a measure distance tool. Additional globes for the Moon and Mars are available, as well as a tool for viewing the night sky. A flight simulator game is also included. Other features allow users to view photos from various places uploaded to Panoramio, information provided by Wikipedia on some locations, and Street View imagery. The web-based version of Google Earth also includes Voyager, a feature that periodically adds in-program tours, often presented by scientists and documentarians.

Google Earth has been viewed by some as a threat to privacy and national security, leading to the program being banned in multiple countries.[2] Some countries have requested that certain areas be obscured in Google's satellite images, usually areas containing military facilities.

History

The core technology behind Google Earth was originally developed at Intrinsic Graphics in the late 1990s. At the time, the company was developing 3D gaming software libraries.[3] As a demo of their 3D software, they created a spinning globe that could be zoomed into, similar to the Powers of Ten film.[3] The demo was popular, but the board of Intrinsic wanted to remain focused on gaming, so in 1999, they created Keyhole, Inc., headed by John Hanke.[3] Keyhole then developed a way to stream large databases of mapping data over the internet to client software, a key part of the technology, and acquired patchworks of mapping data from governments and other sources.[3] The product, called "Keyhole EarthViewer", was sold on CDs for use in fields such as real estate, urban planning, defense, and intelligence; users paid a yearly fee for the service. Despite making a number of capital deals with Nvidia and Sony,[4] the small company was struggling to pay and retain employees.[3]

Fortunes for the company changed in early 2003 during the 2003 invasion of Iraq, when Dave Lorenzini (Director at Keyhole) enticed CNN, ABC, CBS and other major news networks to use their sophisticated 3D flyby imagery to illustrate Baghdad Activities for viewers, in exchange for on-air attribution.[4] [3] During the invasion, It was used extensively by Miles O'Brien and other on-air broadcasters, allowing CNN and millions of viewers to follow the progress of the war in a way that had never been seen before.[4] [3] Public interest in the software exploded and Keyhole servers were not able to keep up with demand.[4] [3] Keyhole was soon contacted by the Central Intelligence Agency's venture capital firm, In-Q-Tel,[5] and the National Geospatial-Intelligence Agency,[6] for use with defense mapping databases, which gave Keyhole a much-needed cash infusion.[3] Intrinsic Graphics was sold in 2003 to Vicarious Visions after its gaming libraries did not sell well, and its core group of engineers and management including Brian McClendon and Michael Jones transitioned to Keyhole with Hanke remaining at the head.[3]

At the time, Google was finding that over 25% of its searches were of a geospatial character, including searches for maps and directions.[3] In October 2004, Google acquired Keyhole as part of a strategy to better serve its users.[7]

In 2021, Google replaced its layers feature with a new one on its Google Earth software.[8] This replacement consolidated some layers, but also removed some layers and features.[9]

Imagery

Google Earth's imagery is displayed on a digital globe, which displays the planet's surface using a single composited image from a far distance. After zooming in far enough, the imagery transitions into different imagery of the same area with finer detail, which varies in date and time from one area to the next. The imagery is retrieved from satellites or aircraft.[10] Before the launch of NASA and the USGS's Landsat 8 satellite, Google relied partially on imagery from Landsat 7, which suffered from a hardware malfunction that left diagonal gaps in images.[11] In 2013, Google used datamining to remedy the issue, providing what was described as a successor to the Blue Marble image of Earth, with a single large image of the entire planet. This was achieved by combining multiple sets of imagery taken from Landsat 7 to eliminate clouds and diagonal gaps, creating a single "mosaic" image.[12] Google now uses a myriad of sources to provide imagery in a higher quality and with greater frequency.[13] Imagery is hosted on Google's servers, which are contacted by the application when opened, requiring an Internet connection.

Imagery resolution ranges from 15 meters of resolution to 15 centimeters. For much of the Earth, Google Earth uses digital elevation model data collected by NASA's Shuttle Radar Topography Mission.[14] This creates the impression of three-dimensional terrain, even where the imagery is only two-dimensional.

Google asserts that 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 data on which Google claims copyright under United States Copyright Law. Google grants licenses in this data allowing, among other things, non-commercial personal use of the images (e.g., on a personal website or blog) as long as copyrights and attributions are preserved.[15] By contrast, images created with NASA's globe software WorldWind use The Blue Marble, Landsat, or USGS imagery, each of which is in the public domain.

In version 5.0, Google introduced Historical Imagery, allowing users to view earlier imagery. Clicking the clock icon in the toolbar opens a time slider, which marks the time of available imagery from the past. This feature allows for observation of an area's changes over time.[16] Utilizing the timelapse feature allows for the ability to view a zoom-able video as far back as 32 years.[17]

3D imagery

Google Earth shows 3D building models in some cities, including photorealistic 3D imagery made using photogrammetry.[18] The first 3D buildings in Google Earth were created using 3D modeling applications such as SketchUp and, beginning in 2009, Building Maker,[19] and were uploaded to Google Earth via the 3D Warehouse. In June 2012, Google announced that it would be replacing user-generated 3D buildings with an auto-generated 3D mesh.[20] This would be phased in, starting with select larger cities, with the notable exception of cities such as London and Toronto which required more time to process detailed imagery of their vast number of buildings. The reason given is to have greater uniformity in 3D buildings and to compete with Nokia Here and Apple Maps, which were already using this technology. The coverage began that year in 21 cities in four countries.[21] By early 2016, 3D imagery had been expanded to hundreds of cities in over 40 countries, including every U.S. state and encompassing every continent except Antarctica.

In 2009, in a collaboration between Google and the Spanish; Castilian: [[Museo del Prado]]|italic=no in Madrid, the museum selected 14 of its paintings to be photographed and displayed at the resolution of 14,000 megapixels inside the 3D version of the Prado in Google Earth and Google Maps.[22] [23]

Street View

See main article: Google Street View. On April 15, 2008, with version 4.3, Google fully integrated Street View into Google Earth.[24] Street View displays 360° panoramic street-level photos of select cities and their surroundings. The photos were taken by cameras mounted on automobiles, can be viewed at different scales and from many angles, and are navigable by arrow icons imposed on them.

Using Street View on Google Earth, users can visit and explore 30 UNESCO World Heritage Sites with historical context and pins for each. The sites include the Great Pyramid, the Taj Mahal, Sagrada Família, the Dolomites, the Royal Botanic Gardens, Kew, and the Great Sphinx.[25]

In 2019, Walt Disney World partnered with Google to create Pixar Street View. A unique activation that enabled viewers to search for hidden Pixar Easter eggs in Toy Story Land at Disney's Hollywood Studios through street view. This creative collaboration elevated Pixar's iconic tradition of hiding Easter eggs in films and introduced it to an immersive new platform.[26]

Water and ocean

Introduced in Google Earth 5.0 in 2009, the Google Ocean feature allows users to zoom below the surface of the ocean and view the 3D bathymetry. Supporting over 20 content layers, it contains information from leading scientists and oceanographers.[27] On April 14, 2009, Google added bathymetric data for the Great Lakes.[28] [29]

In June 2011, Google increased the resolution of some deep ocean floor areas from 1-kilometer grids to 100 meters.[30] 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. This can be seen in the Hudson off New York City, the Wini Seamount near Hawaii, and the Mendocino Ridge off the U.S. Pacific coast.[31]

Outer space

Google has programs and features, including within Google Earth, allowing exploration of Mars, the Moon, the view of the sky from Earth and outer space, including the surfaces of various objects in the Solar System.

Google Sky

Google Sky is a feature that was introduced in Google Earth 4.2 on August 22, 2007, in a browser-based application on March 13, 2008,[32] and to Android smartphones, with augmented reality features. Google Sky allows users to view stars and other celestial bodies.[33] 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. Alberto Conti and his co-developer Carol Christian of STScI planned to add the public images from 2007,[34] as well as color images of all of the archived data from Hubble's Advanced Camera for Surveys. Then-newly released Hubble pictures were added to the Google Sky program as soon as they were issued.

New features such as multi-wavelength data, positions of major satellites and their orbits as well as educational resources are provided to the Google Earth community and also through Christian and Conti's website for Sky.[35] 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 provided by the VOEventNet collaboration.[36] Other programs similar to Google Sky include Microsoft WorldWide Telescope and Stellarium.

Google Mars

Google Mars is an application within Google Earth that is a version of the program for imagery of the planet Mars. Google also operates a browser-based version, although the maps are of a much higher resolution within Google Earth, and include 3D terrain, as well as infrared imagery and elevation data. 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.

Mars also has a small application found near the face on Mars. It is called Meliza, a robot character the user can speak with.[37]

Google Moon

Originally a browser application, Google Moon is a feature that allows exploration of the Moon. Google brought the feature to Google Earth for the 40th anniversary of the Apollo 11 mission on July 20, 2009.[38] It was announced and demonstrated to a group of invited guests by Google along with Buzz Aldrin at the Newseum in Washington, D.C.[39] [40] Google Moon includes several tours, including one for the Apollo missions, incorporating maps, videos, and Street View-style panoramas, all provided by NASA.

Other features

Google Earth has numerous features that allow the user to learn about specific places. These are called "layers", and include different forms of media, including photo and video. Some layers include tours, which guide the user between specific places in a set order. Layers are created using the Keyhole Markup Language, or KML, which users can also use to create customized layers.[41] Locations can be marked with placemarks and organized in folders; For example, a user can use placemarks to list interesting landmarks around the globe, then provide a description with photos and videos, which can be viewed by clicking on the placemarks while viewing the new layer in the application.

In December 2006, Google Earth added a new integration with Wikipedia and Panoramio. For the Wikipedia layer, entries are scraped for coordinates via the . 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.[42] [43] The Panoramio layer features pictures uploaded by Panoramio users, placed in Google Earth based on user-provided location data. In addition to flat images, Google Earth also includes a layer for user-submitted panoramic photos, navigable in a similar way to Street View.

Google Earth includes multiple features that allow the user to monitor current events. In 2007, Google began offering users the ability to monitor traffic data provided by Google Traffic in real-time, based on information crowdsourced from the GPS-identified locations of cell phone users.[44]

Flight simulators

In Google Earth 4.2, a flight simulator was added to the application. It was originally a hidden feature when introduced in 2007, but starting with 4.3, it was given a labeled option in the menu. In addition to keyboard control, the simulator can be controlled with a mouse or joystick.[45] [46] The simulator also runs with animation, allowing objects such as planes to animate while on the simulator.[47]

Another flight simulator, GeoFS, was created under the name GEFS-Online using the Google Earth Plug-in API to operate within a web browser. As of September 1, 2015, the program now uses the open-source program CesiumJS, due to the Google Earth Plug-in being discontinued.[48]

Liquid Galaxy

See main article: Liquid Galaxy. Liquid Galaxy is a cluster of computers running Google Earth creating an immersive experience. On September 30, 2010, Google made the configuration and schematics for their rigs public,[49] placing code and setup guides on the Liquid Galaxy wiki.[50] Liquid Galaxy has also been used as a panoramic photo viewer using KRpano, as well as a Google Street View viewer using Peruse-a-Rue[51] Peruse-a-Rue is a method for synchronizing multiple Maps API clients.[52]

Versions

Google Earth has been released on macOS, Linux, iOS, and Android. The Linux version began with the version 4 beta of Google Earth, as a native port using the Qt toolkit. The Free Software Foundation considers the development of a free compatible client for Google Earth to be a High Priority Free Software Project.[53] Google Earth was released for Android on February 22, 2010,[54] and on iOS on October 27, 2008.[55] [56] The mobile versions of Google Earth can make use of multi-touch interfaces to move on the globe, zoom or rotate the view, and allow to select the current location. An automotive version of Google Earth was made available in the 2010 Audi A8.[57] On February 27, 2020, Google opened up its web-based version of Earth to browsers like Firefox, Edge, and Opera.[58] [59]

Version history
VersionRelease dateChanges
1.0June 10, 2001
1.4January 2002
1.6February 2003
1.7.2October 2003
2.2August 2004
3.0June 2005
  • The first version was released after Google acquired Keyhole, Inc.
4.0June 2006
4.1May 2007
4.2August 2007
  • Google Sky was introduced
  • A flight simulator was added
4.3April 2008
  • First release to implement KML version 2.2
  • Google Street View was added
5.0May 2009
  • Google Ocean was introduced
  • Historical Imagery was introduced
5.1November 2009
5.2July 2010
  • Last version to support Mac OS X 10.4 Tiger (PPC & Intel) and 10.5 Leopard (PPC)
6.0March 2011
  • 3D Trees were added
6.1October 2011
6.2April 2012
  • Last version to support Mac OS X 10.5 Leopard (Intel)
7.0December 2012
  • Support for 3D Imagery data was introduced
  • Tour Guide was introduced
7.1April 2013
  • Last version to support Mac OS X 10.6 Snow Leopard and Mac OS X 10.7 Lion
7.3July 2017
  • Google Earth Pro became the standard version of the desktop program. (A free license key was also publicly provided by Google for all the earlier Pro versions.)[60]
  • The desktop application continues to be Google Earth Pro 7.3, with infrequent updates.
8.0October 2014
  • Android-only update with new 3D rendering engine and feature to import KML files from Google Drive.[61]
9.0April 2017
  • Redesign of the mobile and web apps featuring Voyager, "I'm Feeling Lucky" button, and 3D mode.[62]
  • iOS received update in August 2017.[63]
10.0September 2023
  • Mobile and web apps updated to latest Material Design theme with support for project creation. Voyager was removed from app.[64]

Google Earth Pro

Google Earth Pro was originally the business-oriented upgrade to Google Earth, with features such as a movie maker and data importer. Up until late January 2015, it was available for $399/year, though Google decided to make it free to the public.[65] [66] Google Earth Pro is currently the standard version of the Google Earth desktop application as of version 7.3.[67] The Pro version includes add-on software for movie making, advanced printing, and precise measurements, and is available for Windows, macOS, and Linux.[68]

Google Earth Plus

Discontinued in December 2008, Google Earth Plus was a paid subscription upgrade to Google Earth that provided customers with the following features, most of which have become available in the free Google Earth.[69] One such feature was GPS integration, which allowed users to read tracks and waypoints from a GPS device. A variety of third-party applications have been created which provide this functionality using the basic version of Google Earth by generating KML or KMZ files based on user-specified or user-recorded waypoints.

Google Earth Enterprise

Google Earth Enterprise is designed for use by organizations whose businesses could take advantage of the program's capabilities, for example by having a globe that holds company data available for anyone in that company.[70] As of March 20, 2015, Google has retired the Google Earth Enterprise product, with support ended on March 22, 2017.[71] Google Earth Enterprise allowed developers to create maps and 3D globes for private use, and host them through the platform. GEE Fusion, GEE Server, and GEE Portable Server source code was published on GitHub under the Apache2 license in March 2017.[72]

Google Earth Studio

Google Earth Studio is a web-based version of Google Earth used for animations using Google Earth's 3D imagery. As of June 2021, it is preview-only and requires signing up to use it.[73] It features keyframe animation, presets called "Quick-Start Projects", and 3D camera export.[74]

Google Earth 9

Google Earth 9 is a version of Google Earth first released on April 18, 2017, having been in development for two years.[75] The main feature of this version was the launching of a new web version of Google Earth.[76] This version added the "Voyager" feature, whereby users can view a portal page containing guided tours led by scientists and documentarians.[77] The version also added an "I'm Feeling Lucky" button, represented by a die, which takes the user to a random location on Earth along with showing them a "Knowledge Card" containing a short excerpt from the location's Wikipedia article.

Google Earth Plug-in

The Google Earth API was a free beta service, allowing users to place a version of Google Earth into web pages. The API enabled sophisticated 3D map applications to be built.[78] At its unveiling at Google's 2008 I/O developer conference, the company showcased potential applications such as a game where the player controlled a milktruck atop a Google Earth surface.[79] The Google Earth API has been deprecated as of December 15, 2014, and remained supported until December 15, 2015.[80] Google Chrome ended support for the Netscape Plugin API (which the Google Earth API relies on) by the end of 2016.[81]

Google Earth VR

On November 16, 2016, Google released a virtual reality version of Google Earth for Valve's Steam computer gaming platform.[82] [83] Google Earth VR allows users to navigate using VR controllers, and is currently compatible with the Oculus Rift and HTC Vive virtual reality headsets. On September 14, 2017, as part of Google Earth VR's 1.4 update, Google added Street View support.[84]

Google Earth Outreach

Google Earth Outreach is a charity program, through which Google promotes and donates to various non-profit organizations. Beginning in 2007, donations are often accompanied by layers featured in Google Earth, allowing users to view a non-profit's projects and goals by navigating to certain related locations.[85] Google Earth Outreach offers online training on using Google Earth and Google Maps for public education on issues affecting local regions or the entire globe. In June 2008, training was given to 20 indigenous tribes in the Amazon rainforest, such as the Suruí, to help them preserve their culture and raise awareness for the problem of deforestation.[86]

Non-profit organizations featured in Google Earth via the Outreach program include Arkive, the Global Heritage Fund, WaterAid, and the World Wide Fund for Nature.[87] [88]

Google Earth Engine

Google Earth Engine is a cloud computing platform for processing satellite imagery and other geospatial and observation data. It provides access to a large database of satellite imagery and the computational power needed to analyze those images.[89] Google Earth Engine allows observation of dynamic changes in agriculture, natural resources, and climate using geospatial data from the Landsat satellite program, which passes over the same places on the Earth every sixteen days.[90] [91] Google Earth Engine has become a platform that makes Landsat and Sentinel-2 data easily accessible to researchers in collaboration with the Google Cloud Storage.[90] Google Earth Engine provides a data catalog along with computers for analysis; this allows scientists to collaborate using data, algorithms, and visualizations.[92] The platform provides Python and JavaScript application programming interfaces for making requests to the servers,[93] and includes a graphical user interface[94] for developing applications.

An early prototype of Earth Engine, based on the Carnegie Institute for Science's CLASlite system and Imazon's Sistema de Alerta de Desmatamento (SAD) was demonstrated in 2009[95] at COP15, and Earth Engine was officially launched in 2010[96] at COP16, along with maps of the water in the Congo basin and forests in Mexico produced by researchers using the tool.

In 2013, researchers from University of Maryland produced the first high-resolution global forest cover and loss maps using Earth Engine, reporting an overall loss in global forest cover.[97] Other early applications using Earth Engine spanned a diverse variety of topics, including: Tiger Habitat Monitoring,[98] Malaria Risk Mapping,[99] Global Surface Water,[100] increases in vegetation around Mount Everest,[101] and the annual Forest Landscape Integrity Index.[102] Since then, Earth Engine has been used in the production of hundreds of scientific journal articles[103] in many fields including: forestry and agriculture, hydrology, natural disaster monitoring and assessment, urban mapping, atmospheric and climate sciences and soil mapping.

Earth Engine has been free for academic and research purposes since its launch, but commercial use was prohibited until 2021, when Google announced a preview of Earth Engine as a commercial cloud offering and early adopters that included Unilever, USDA and Climate Engine.[104]

Controversy and criticism

The software has been criticized by a number of special interest groups, including national officials, as being an invasion of privacy or 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. Google Earth has been blocked by Google in Iran[105] and Sudan[106] since 2007, due to United States government export restrictions. The program has also been blocked in Morocco since 2006 by Maroc Telecom, a major service provider in the country.[107] In the academic realm, increasing attention has been devoted to both Google Earth and its place in the development of digital globes. In particular, the International Journal of Digital Earth features multiple articles evaluating and comparing the development of Google Earth and its differences when compared to other professional, scientific, and governmental platforms.[108] Google Earth's role in the expansion of "Earth observing media" has been examined to understand how it is shaping a shared cultural consciousness regarding climate change and humanity's capacity to treat the Earth as an engineerable object.[109]

Defense

National security

Other concerns

In popular culture

Google Earth is featured prominently in the 2021 German miniseries The Billion Dollar Code, which serves as a fictionalized account of a 2014 patent infringement lawsuit brought against Google by the German creators of Terravision.[134] The series, which was shown on Netflix is prefaced by an episode of interviews with the ART+COM developers of Terravision and their legal representative.[135]

One of the co-founders of Keyhole has published a first-hand account claiming to debunk the origins, timelines and interpretations depicted in the fictionalized miniseries.[136] Not shown in the mini-series was that the patent owned by ART+COM and used to challenge Google was completely invalidated, after it was shown that another so-called TerraVision, this one at the Stanford Research Institute, predated ART+COM's ideas by several years.[137]

See also

External links

Notes and References

  1. Web site: Google reveals just how much of the world it's mapped with Street View and Earth. December 18, 2021. www.theverge.com. December 13, 2019. en. May 25, 2022. https://web.archive.org/web/20220525062423/https://www.theverge.com/2019/12/13/21020814/google-world-mapped-street-view-earth-square-miles. live.
  2. Web site: US general claims Google Earth is a risk to security . July 16, 2022 . IT PRO . June 22, 2007 . en . July 16, 2022 . https://web.archive.org/web/20220716180511/https://www.itpro.co.uk/118003/us-general-claims-google-earth-is-a-risk-to-security . live .
  3. Book: Never Lost Again: The Google Mapping Revolution That Sparked New Industries and Augmented Our Reality . HarperBusiness . Bill Kilday . 2018 . 978-0062673046 .
  4. News: Tiny tech company awes viewers. Kevin Manney. USA Today. March 21, 2003. August 29, 2017. September 13, 2012. https://web.archive.org/web/20120913092856/http://www.usatoday.com/tech/news/techinnovations/2003-03-20-earthviewer_x.htm. live.
  5. Meet The CIA's Venture Capitalist . . dead. https://web.archive.org/web/20130605121646/http://www.businessweek.com/stories/2005-05-09/meet-the-cias-venture-capitalist . June 5, 2013 .
  6. Web site: Oakland emails give another glimpse into the Google-Military-Surveillance Complex. PandoDaily. March 7, 2014. August 14, 2017. May 8, 2016. https://web.archive.org/web/20160508154602/https://pando.com/2014/03/07/the-google-military-surveillance-complex/. dead.
  7. News: Google Acquires Keyhole. Wall Street Journal. October 27, 2004. December 3, 2017. December 4, 2017. https://web.archive.org/web/20171204171107/https://www.wsj.com/articles/SB109888284313557107. live.
  8. Web site: July 20, 2021 . New layers set in Google Earth Pro! . Staff . live . November 9, 2011 . Google Earth Help . November 9, 2021 . https://web.archive.org/web/20211109223634/https://support.google.com/earth/thread/117930184/new-layers-set-in-google-earth-pro?hl=en%20layers%20feature .
  9. Web site: September 4, 2021. County boundaries and other information missing from new Borders and Labels layer. live. November 9, 2021. Google Earth Help. November 9, 2021. https://web.archive.org/web/20211109223635/https://support.google.com/earth/thread/124369583/county-boundaries-and-other-information-missing-from-new-borders-and-labels-layer?hl=en.
  10. Web site: How images are collected. August 6, 2017. September 19, 2017. https://web.archive.org/web/20170919215532/https://support.google.com/earth/answer/6327779. live.
  11. Web site: SLC-off Products: Background. United States Geological Survey. August 6, 2017. https://web.archive.org/web/20170807072341/https://landsat.usgs.gov/slc-products-background. August 7, 2017. dead.
  12. Web site: Only clear skies on Google Maps and Earth. June 26, 2013. August 6, 2017. August 7, 2017. https://web.archive.org/web/20170807072138/https://maps.googleblog.com/2013/06/only-clear-skies-on-google-maps-and.html. live.
  13. Web site: Google Earth and Maps get sharper satellite imagery with new update. Tech Crunch. June 27, 2016. August 6, 2017. August 7, 2017. https://web.archive.org/web/20170807072458/https://techcrunch.com/2016/06/27/google-earth-and-maps-get-sharper-satellite-imagery-with-new-update/. live.
  14. 10.1029/2005RG000183 . 2007RvGeo..45.2004F. The Shuttle Radar Topography Mission. Reviews of Geophysics. 45. 2. RG2004. Farr. Tom G.. Rosen. Paul A.. Caro. Edward. Crippen. Robert. Duren. Riley. Hensley. Scott. Kobrick. Michael. Paller. Mimi. Rodriguez. Ernesto. Roth. Ladislav. Seal. David. Shaffer. Scott. Shimada. Joanne. Umland. Jeffrey. Werner. Marian. Oskin. Michael. Burbank. Douglas. Alsdorf. Douglas. 2007. 10.1.1.102.9372. 140735782 . 1944-9208 .
  15. Web site: Google Earth Help Center . Can I post images to the web? . January 20, 2007 . September 27, 2011 . https://web.archive.org/web/20110927051807/http://earth.google.com/support/bin/answer.py?answer=21422 . live .
  16. Web site: Dive into New Google Earth . February 3, 2009 . February 3, 2009 . https://web.archive.org/web/20090203181324/http://googleblog.blogspot.com/2009/02/dive-into-new-google-earth.html . live .
  17. "Timelapse." Google Earth Engine, earthengine.google.com/timelapse/.
  18. Gopal Shah, Google Earth's Incredible 3D Imagery, Explained, April 18, 2017
  19. Web site: Introducing Google Building Maker. July 24, 2016. August 19, 2016. https://web.archive.org/web/20160819071811/https://maps.googleblog.com/2009/10/introducing-google-building-maker.html. live.
  20. Web site: Explore the world with tour guide and 3D imagery in Google Earth 7. Google LatLong Blog. July 24, 2016. January 28, 2016. https://web.archive.org/web/20160128194004/http://google-latlong.blogspot.ca/2012/10/explore-world-with-tour-guide-and-3d.html. live.
  21. Web site: Google Earth adds new 3D imagery in 21 cities to its 11,000 guided tours of our planet. July 24, 2016. November 2012. February 21, 2019. https://web.archive.org/web/20190221000600/https://venturebeat.com/2012/10/31/google-earth-adds-new-3d-imagery-in-21-cities-to-its-11000-guided-tours-of-our-planet/. live.
  22. News: Online gallery zooms in on Prado's masterpieces (even the smutty bits). Giles Tremlett. Giles Tremlett. January 14, 2009. The Guardian. London. December 11, 2016. February 2, 2017. https://web.archive.org/web/20170202105601/https://www.theguardian.com/artanddesign/2009/jan/14/museums-internet-google-earth-prado. live.
  23. Web site: 14 masterpieces from the Museo del Prado in mega-high resolution on Google Earth. January 14, 2009. December 3, 2017. Museo del Prado. December 4, 2017. https://web.archive.org/web/20171204222822/https://www.museodelprado.es/en/whats-on/new/14-masterpieces-from-the-museo-del-prado-in/220f2fe9-beec-44a2-afdb-8c67ff37256c. live.
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