Google Maps

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Google Maps
Google maps logo.png
Google Maps directions.png
Screenshot of Google Maps showing a route from San Francisco to Los Angeles on Interstate 5.
URL maps.google.com
Type of site Web mapping
Registration No
Available language(s) Multilingual
Owner Google
Created by Google
Current status Active

Google Maps (for a time named Google Local) is a basic web mapping service application and technology provided by Google, free (for non-commercial use), that powers many map-based services, including the Google Maps website, Google Ride Finder, Google Transit,[1] and maps embedded on third-party websites via the Google Maps API.[2] It offers street maps, a route planner for traveling by foot, car, or public transport and an urban business locator for numerous countries around the world. According to one of its creators (Lars Rasmussen), Google Maps is "a way of organizing the world's information geographically".[3]

Google Maps uses the Mercator projection, so it cannot show areas around the poles. A related product is Google Earth, a stand-alone program for Microsoft Windows, Mac OS X, Linux, SymbianOS, and iPhone OS which offers more globe-viewing features, including showing polar areas.

Contents

[edit] Satellite view

Google Maps provides high-resolution satellite images for most urban areas in the United States (including Hawaii, Alaska, Puerto Rico, and the U.S. Virgin Islands), Canada, and the United Kingdom, as well as parts of Australia and many other countries. The high-resolution imagery has been used by Google Maps to cover all of Egypt's Nile Valley, Sahara desert and Sinai. Google Maps also covers many cities in the English speaking areas. However, Google Maps is not solely an English maps service, since its service is intended to cover the world. The highest-resolution images are in some Japanese cities, such as Tokyo.

Various governments have complained about the potential for terrorists to use the satellite images in planning attacks.[4] Google has blurred some areas for security (mostly in the United States)[5], including the U.S. Naval Observatory area (where the official residence of the Vice President is located), and previously[citation needed] the United States Capitol and the White House (which formerly featured this erased housetop). Other well-known government installations, including Area 51 in the Nevada desert, are visible. Not all areas on satellite images are covered in the same resolution; less populated areas usually get less detail. Some areas may be obscured by patches of clouds.[6][7]

With the introduction of an easily pannable and searchable mapping and satellite imagery tool, Google's mapping engine prompted a surge of interest in satellite imagery. Sites were established which feature satellite images of interesting natural and man-made landmarks, including such novelties as "large type" writing visible in the imagery, as well as famous stadia and unique geological formations. As of November 2008, the U.S. National Weather Service also now uses Google Maps within its local weather forecasts, showing the 5 x 5 km "point forecast" squares used in forecast models.[8]

Although Google uses the word satellite, most of the high-resolution imagery is aerial photography taken from airplanes rather than from satellites.[9]

See also: Coverage details of Google Maps

[edit] Directions

Google Maps directions work:

^ = not all roads are featured in this country, so directions are very limited.

* = has directions and places of interest.

[edit] Implementation

Like many other Google web applications, Google Maps uses JavaScript extensively. As the user drags the map, the grid squares are downloaded from the server and inserted into the page. When a user searches for a business, the results are downloaded in the background for insertion into the side panel and map; the page is not reloaded. Locations are drawn dynamically by positioning a red pin (composed of several partially-transparent PNGs) on top of the map images.

A hidden IFrame with form submission is used because it preserves browser history. The site also uses JSON for data transfer rather than XML, for performance reasons. These techniques both fall under the broad Ajax umbrella.

[edit] Extensibility and customization

As Google Maps is coded almost entirely in JavaScript and XML, some end users have reverse-engineered the tool and produced client-side scripts and server-side hooks which allowed a user or website to introduce expanded or customized features into the Google Maps interface.

Using the core engine and the map/satellite images hosted by Google, such tools can introduce custom location icons, location coordinates and metadata, and even custom map image sources into the Google Maps interface. The script-insertion tool Greasemonkey provides a large number of client-side scripts to customize Google Maps data.

Combinations with photo sharing websites, such as Flickr, are used to create "memory maps". Using copies of the Keyhole satellite photos, users have taken advantage of image annotation features to provide personal histories and information regarding particular points of the area.

[edit] Google Maps API

Google created the Google Maps API to allow developers to integrate Google Maps into their websites with their own data points. It is a free service, and currently does not contain ads, but Google states in their terms of use that they reserve the right to display ads in the future.[10]

By using the Google Maps API, it is possible to embed the full Google Maps site into an external website. Developers are required to request an API key,[11] which is bound to the website and directory entered when creating the key. The Google Maps API key is no longer required for API version 3. Creating a customized map interface requires adding the Google JavaScript code to a page, and then using Javascript functions to add points to the map.

When the API first launched, it lacked the ability to geocode addresses, requiring users to manually add points in (latitude, longitude) format. This feature has since been added for premier.

At the same time as the release of the Google Maps API, Yahoo! released its own Maps API.[12] The releases coincided with the O'Reilly Web 2.0 Conference. Yahoo! Maps, which lacks international support, included a geocoder in the first release.

As of October 2006, the implementation of Google Gadgets' Google Maps is simpler, requiring only one line of script, but it is not as customizable as the full API.

In 2006, Yahoo! began a campaign to upgrade its maps to compete better with Google and other online map companies. Several of the maps used in a survey were similar to Google maps.

Google Maps actively promotes the commercial use of its API. Some of its first large-scale adopters were real estate mash-up sites. Google performed a case study[13] about Nestoria, a property search engine in the UK and Spain.

[edit] Google Maps for Mobile

In 2006, Google introduced a Java application called Google Maps for Mobile, intended to run on any Java-based phone or mobile device. Many of the web-based site's features are provided in the application.[14]

On November 28, 2007, Google Maps for Mobile 2.0 was released. It introduced a GPS-like location service that does not require a GPS receiver. The "my location" feature works by utilizing first of all the GPS location of the mobile device, if it is available. This information is supplemented by the software determining the nearest wireless networks and cell sites. The software then looks up the location of the cell site using a database of known wireless networks and cell sites. The Cell-site location method is used by triangulating the different signal strengths from different cell transmitters and then using their location property (retrieved from the online cell site database) to aid My Location in determining the user's current location. Wireless network location method is calculated by discovering the nearby WiFi hotspots and using their location property (retrieved from the online WiFi database, in the same way as the cell site database) to further discover the user's location. The order in which these take precedence is:

  • GPS-based services
  • WLAN-based / WiFi-based services
  • Cell transmitter-based services

The software plots the streets in blue that are available with a yellow icon and a green circle around the estimated range of the cell site based on the transmitter's rated power (among other variables). The estimate is refined using the strength of the cell phone signal to estimate how close to the cell site the mobile device is.

As of December 15, 2008 (2008 -12-15), this service is available for the following platforms:[15]

On November 4th, 2009, Google Maps Navigation was released in conjunction with Google Android OS 2.0 Eclair on the Motorola Droid, adding voice commands, traffic reports, and street view support.[16] The initial release is limited to the United States.[17]


Android 2.0
Android 2.0 is an operating system for mobile devices and is an upgrade from its previous versions. It provides platform (APIs) for developing new mobile applications using JAVA as the programming language. It has new APIs for better capabilities to manage accounts, contacts and sync, including a Quick Contact API. Unlike other cell phone OS, Android 2.0 also supports different screen display sizes.[18] APIs include:

  • Account Manager API - allows developer to store data centrally and securely
  • Contacts API- allows developer to generate contact list from multiple accounts (e.g., email)
  • Sync API - allows developer to sync device with any back-end system.

Google Maps Android 2.0.
Cell phones are being increasingly used for navigation assistance. However, written driving instructions are sometimes very confusing to follow. While navigation devices have become a billion dollar industry, Google Maps Navigation for Android 2.0 is free. An iPhone implementation is also being planned.[19]

Features Provided in the Application:

  • Search in plain English
  • Search by voice
  • Traffic view
  • Search along route
  • Satellite view
  • Street View
  • Car dock mode

Impact
Google Maps Navigation is free and this will have a major impact on the navigation industry. The drawback of Google Maps for Android is that an internet connection is required to get maps and related information from Google Maps, just like with iPhone’s Google Maps application. It may be possible for Google to circumvent the Internet requirement. A similar system is being developed for the iPhone.[20]

Shares of Tom-Tom, Garmin and other navigation service providers fell by almost twenty-five percent (25%) after Google's announcement of Google Maps for Navigation. The application is only available initially to Verizon users with Android 2.0 or higher. It is doubtful that users will continue to pay for navigation service if Google provides it for free.

Google Map Navigation is interrupted in cell phone dead zones. In contrast, iPhone’s app operates as a traditional GPS device when there’s no cell phone signal. This is particularly relevant on streets with high rise buildings and on highways.[21]

[edit] Google Maps parameters

In Google Maps, URL parameters may be tweaked to offer views and options not normally available through on-screen controls.

For instance, the maximum zoom level offered is normally 18, but if higher-resolution images are available, changing the z parameter, which sets the zoom level, will allow the user to access them, as in this view of elephants or this view of people at a well deep in Chad, Africa using the parameter z=23.

A list of Google Maps parameters and their descriptions is available.

[edit] Development history

Google Maps first started as a software application developed by Lars and Jens Rasmussen for the company Where2. In October 2004 the company was acquired by Google Inc[22] where it transformed into the web application Google Maps. The application was first announced on the Google Blog on February 8, 2005,[23] and was located at Google.[24] It originally only supported users of Internet Explorer and Mozilla web browsers, but support for Opera and Safari was added on February 25, 2005, but currently Opera is removed from the system requirements list. Currently (September 2009) Internet Explorer 6.0+, Firefox 2.0+, Safari 3.1+, and Google Chrome are supported.[25] It was in beta for six months before becoming part of Google Local on October 6, 2005.

 This section is in a list format that may be better presented using prose. You can help by converting this section to prose, if appropriate. Editing help is available. (April 2008)

[edit] Google's use of Google Maps

The main Google Maps site includes a local search feature, which can be used to locate businesses of a certain type in a geographic area.

[edit] Google Ditu

Google Ditu (谷歌地图 lit. "Google Maps") was released to the public on February 9, 2007, and replaced the old Google Bendi (谷歌本地 lit. "Google Local"). This is the Chinese localized version of Google Maps and Google Local services.

[edit] Google Moon

Main article: Google Moon
Google Moon

In honor of the 36th anniversary of the Apollo 11 moon landing on July 20, 1969, Google took public domain imagery of the Moon, integrated it into the Google Maps interface, and created a tool called Google Moon.[37] By default this tool, with a reduced set of features, also displays the points of landing of all Apollo spacecraft to land on the Moon. It also included an easter egg, displaying a Swiss cheese design at the highest zoom level, which Google has since removed. A recent collaborative project between NASA Ames Research Center and Google is integrating and improving the data that is used for Google Moon. This is the Planetary Content[38] Project. Google Moon was linked from a special commemorative version of the Google logo displayed at the top of the main Google search page for July 20, 2005 (UTC) webarchive.org.

[edit] Google Mars

Main article: Google Mars
Google Mars

Google Mars provides a visible imagery view, like Google Moon, as well as infrared imagery and shaded relief (elevation) of the planet Mars. Users can toggle between the elevation, visible, and infrared data, in the same manner as switching between map, satellite, and hybrid modes of Google Maps. In collaboration with NASA scientists at the Mars Space Flight Facility located at Arizona State University, Google has provided the public with data collected from two NASA Mars missions, Mars Global Surveyor and 2001 Mars Odyssey.[39]

NASA has made available a number of Google Earth desktop client maps for Mars at http://onmars.jpl.nasa.gov/.

More Mars data sets with more recent data are available at Google Maps based interface at http://jmars.asu.edu/maps provided by the Mars Space Flight Facility Arizona State University

Now, with Google Earth 5 it is possible to access new improved Google Mars data at a much higher resolution, as well as being able to view the terrain in 3D, and viewing panoramas from various Mars landers in a similar way to Google Street View.

[edit] Google Sky

Main article: Google Sky

On August 27, 2007, Google introduced Google Sky, an online space mapping tool that allows users to pan through a map of the visible universe, using photographs taken by the Hubble Space Telescope.

Wiki letter w.svg This section requires expansion.

[edit] Google Ride Finder

Google launched an experimental Google Maps-based tool called Ride Finder, tapping into in-car GPS units for a selection of participating taxi and limousine services. The tool displays the current location of all supported vehicles of the participating services in major U.S. cities, including Chicago and San Francisco on a Google Maps street map. As of 2009 the tool seems to be discontinued. Not to be confused with carpooling.

[edit] Google Transit

In December 2005, Google launched Google Transit on Google Labs a 20% project of Chris Harrelson and Avichal Garg[40]. Google Transit launched initially with support for Portland, Oregon, and now includes hundreds of cities in the United States, Canada, Europe, Asia, Africa, and Australia. The service calculates route, transit time and cost, and can compare the trip to one using a car. In October 2007,[41] Google Transit graduated from Google Labs and became fully integrated into Google Maps.

[edit] Google My Maps

In April 2007, My Maps was a new feature added to Google's local search maps. My Maps lets users and businesses create their own map by positioning markers, polylines and polygons onto a map. The interface is a straightforward overlay on the map. A set of eighty-four pre-designed markers is available, ranging from bars and restaurants to webcam and earthquake symbols. Polyline and Polygon color, width and opacity are selectable. Maps modified using My Maps can be saved for later viewing and made public or marked as private.

Each element added to a My Map has an editable tag. This tag can contain text, rich text or HTML. Embeddable video and other content can be included within the HTML tag.

Upon the launch of My Maps there was no facility to embed the created maps into a webpage or blog. A few independent websites have now produced tools to let users embed maps and add further functionality to their maps.[42] This has been resolved with version 2.78.

[edit] Google Street View

Main article: Google Street View

On May 25, 2007, Google released Street View, a new feature of Google Maps which provides 360° panoramic street-level views of various U.S. cities. On this date, the feature only included five cities, but has since expanded to thousands of locations in the United States, United Kingdom, Netherlands, France, Italy, Spain, Switzerland, Australia, Canada, New Zealand, Japan and the Czech Republic.

In August 2008, Australia was added to the Street View feature with nearly all Australian highways, roads and streets having the feature. In addition in that month Japan was added and the Tour de France route was added on July 2 of that year. In December 2008, New Zealand was added to street view. Australia and New Zealand are the only countries to date with almost all roads and highways featured.

July 2009, Google begins mapping college campuses and surrounding paths and trails.[43]

In December 2009, Google announced the launch of Street View in Singapore, allowing users to view and navigate 360 degree street-level imagery of Singapore.[44] In addition to viewing the images on PC, Street View can be accessed on mobile phone.

Google Street View gained a significant amount of controversy in the days following its release. Initially privacy concerns erupted due to the uncensored nature of its panoramic photographs.[45][46] Since then, Google has begun blurring faces using an automated face detection technology.[47]

[edit] Google Latitude

Main article: Google Latitude

Google Latitude is a feature from Google that lets users share their physical locations with other people. This service is based on Google Maps, specifically on mobile devices. There's an iGoogle widget for Desktops and Laptops as well.[48] Some concerns have been expressed about the privacy issues raised by the use of the service.[49]

[edit] Google Flu Shot Finder

Google Flu Shot Finder allows users in the United States to identify locations where both the pandemic H1N1/09 virus and seasonal flu vaccines are available near a given address or ZIP code.

[edit] Monopoly City Streets

Monopoly City Streets is a live worldwide version of the game Monopoly using Google Maps as the game board. It was created by Google and Hasbro.[50]

[edit] Mashups

Main article: Mashup (web application hybrid)

Google maps links to the geo-tags placed in Wikipedia articles. It also links to photos with GPS tags from Panoramio.

[edit] Copyright

The Google Maps terms and conditions[51] state that usage of material from Google Maps is regulated by Google Terms of Service[52] and some additional restrictions. The terms and conditions also state:

For individual users, Google Maps [...] is made available for your personal, non-commercial use only. For business users, Google Maps is made available for your internal use only and may not be commercially redistributed [...][51]

[edit] Criticism

See also: Satellite map images with missing or unclear data

Street map overlays, in some areas, may not match up precisely with the corresponding satellite images. The street data may be entirely erroneous, or simply out of date:

The biggest challenge is the currency of data, the authenticity of data," said Google Earth representative Brian McLendon. In other words: The main complaints the Google guys get are "that's not my house" and "that's not my car." Google Maps satellite images are not in real time; they are several years old.[53]

As a result, in March 2008 Google added a feature to edit the locations of houses and businesses.[54][55]

Restrictions have been placed on Google Maps through the apparent censoring of locations deemed potential security threats. In some cases the area of redaction is for specific buildings, but in other cases, such as Washington, D.C.,[56] the restriction is to use outdated imagery. These locations are fully listed on Satellite map images with missing or unclear data.

Google Maps has difficulty processing road data when dealing with cross-boundary situations. For example, users are unable to obtain a route from Hong Kong to Shenzhen via Shatoujiao, because Google Maps does not display and plan the road map of two overlapping places.[57]

Sometimes objects on Google Maps are hidden by clouds. For example, the mast of Arbrå Transmitter near Bollnäs in Sweden is hidden under a cloud.

The map uses the Mercator projection, which is increasingly distorted towards the polar regions.

Sometimes the names of geographical locations are inaccurate. An example of this type of error may be found in Google Maps Laona, Wisconsin. In this instance Google Maps identifies one of the town's two major lakes as "Dawson Lake";[58] the USGS, State of Wisconsin, and local government maps all identify that map feature as "Scattered Rice Lake".[59] Another example is Samoa, labeled with "Western Samoa", accurate only as recently as 1997.

Google collates business listings from multiple on-line and off-line sources. To reduce duplication in the index, Google's algorithm combines listings automatically based on address, phone number, or geocode,[60] but sometimes information for separate businesses will be inadvertently merged with each other, resulting in listings inaccurately incorporating elements from multiple businesses.[61]

Google has also recruited volunteers to check and correct ground truth data.[62]

There are some differences in frontier alignments between Google Ditu and Google Maps. On Google Maps, sections of the Chinese border with India and Pakistan are shown with dotted lines, indicating areas or frontiers in dispute. However, Google Ditu shows the Chinese frontier strictly according to Chinese claims with no dotted lines indicating the border with India and Pakistan. For example, the area now administered by India called Arunachal Pradesh (referred to as "South Tibet" by China) is shown inside the Chinese frontier by Google Ditu, with Indian highways ending abruptly at the Chinese claim line. Google Ditu also shows Taiwan and the South China Sea Islands as part of China. As of May 2009, Google Ditu's street map coverage of Taiwan also omits major state organs, such as the Presidential Palace, the five Yuans, and the Supreme Court.

There are some differences between ditu.google.cn and ditu.google.com. For example, the former does not feature My Maps. On the other hand, while the former displays virtually all text in Chinese, the latter displays most text (user-selectable real text as well as those on map) in English. This behavior of displaying English text is not consistent but intermittent - sometimes it is in English, sometimes it is in Chinese. The criteria for choosing which language is displayed is not known.

[edit] See also

[edit] Comparable services

[edit] References

  1. ^ "Google Transit: A Great Asset to ‘Google Maps’". http://www.techpluto.com/google-transit-benefits/. 
  2. ^ "What is the Google Maps API?". http://code.google.com/apis/maps/. 
  3. ^ ABC Fora- Lars Rasmussen on Inventing Google Maps
  4. ^ Google Earth prompts security fears. 08/08/2005. ABC News Online
  5. ^ "Blurred Out: 51 Things You Aren't Allowed to See on Google Maps". http://www.itsecurity.com/features/51-things-not-on-google-maps-071508/. 
  6. ^ Google support forum Clouds over Delhi
  7. ^ Hows does Google Maps work
  8. ^ New Maps on our Point and Click Forecast Pages
  9. ^ Google Earth FAQ (Google Earth and Google Maps use the same imagery)
  10. ^ "Google Maps API - Terms of use". http://www.google.com/apis/maps/terms.html. 
  11. ^ "Google Maps API key". http://www.google.com/apis/maps/signup.html. 
  12. ^ "Yahoo! Maps API". http://developer.yahoo.com/maps/index.html. 
  13. ^ Google Code
  14. ^ in-depth review
  15. ^ Google Maps on your phone
  16. ^ Google Redefines GPS Navigation Landscape: Google Maps Navigation For Android 2.0
  17. ^ Google Maps for mobile announce Navigation Beta for Android 2.0 - GSMArena.com news
  18. ^ Android.com
  19. ^ Iphonehacks.com
  20. ^ Blogspot.com
  21. ^ Google.com
  22. ^ Google's Sergey Brin spills on the secrets of a nimble giant - Hedgehogs.net
  23. ^ Google Maps announcement on Google Blog.
  24. ^ Maps.google.com
  25. ^ Google Maps Help
  26. ^ "Google accused of airbrushing Katrina history". msnbc. 2007-03-30. http://www.msnbc.msn.com/id/17880969/. 
  27. ^ "Google Restores Katrina's Scars To Google Earth". Information Week. 2007-04-02. http://www.informationweek.com/news/internet/search/showArticle.jhtml?articleID=198701867. )
  28. ^ Google Mars
  29. ^ "The prodigal son of a search engine comes home". blumenthals.com. http://blumenthals.com/blog/2006/12/28/the-prodigal-son-of-a-search-engine-comes-home/. 
  30. ^ "New Google UI feature: Plus Box". Matt Cutts. http://www.dullest.com/blog/new-google-ui-feature-plus-box/. 
  31. ^ "Google Maps With Multiple Destinations". Philipp Lenssen. http://blogoscoped.com/archive/2006-12-19.html#n36. 
  32. ^ "Google Maps adds subway stops, building outlines to cities". CNET. http://news.com.com/2061-10812_3-6160719.html. 
  33. ^ a b c d e f g h i j k l "Do you know how many Maps features have been launched in the past 6 months?". Google Maps Water Cooler. 2009-01-13. http://maps-forum-announcements.blogspot.com/2009/01/do-you-know-how-many-maps-features-have.html. Retrieved 2009-05-10. 
  34. ^ Google to buy GeoEye satellite imagery | Digital Media - CNET News
  35. ^ Google’s Super Satellite Captures First Image | Wired Science | Wired.com
  36. ^ "New logo look". http://googleblog.blogspot.com/2009/05/new-logo-look.html. 
  37. ^ Google Moon
  38. ^ Intelligent Systems Division | Project
  39. ^ About Google Mars
  40. ^ Google Transit Expands to New York - City Room Blog - NYTimes.com
  41. ^ Google LatLong: Google Transit Graduates from Labs
  42. ^ embed my maps - Google Search
  43. ^ "Google Tricycle Mapper". Examiner. 2007-06-01. http://www.examiner.com/x-14111-Twin-Falls-Bicycle-Transportation-Examiner~y2009m6d21-Bicycle-job-Google-tricycle-mapper. 
  44. ^ "Street View on Google Maps comes to Singapore". Singapore Tourism Board and Google. 2009-12-02. http://sites.pressatgoogle.com/sgstreetview/press-release-and-or-googlegram. 
  45. ^ "The Google 'ick' factor". 2007-06-15. http://ifpandnpthenwe.gnn.tv/headlines/14488/The_Google_ick_factor. 
  46. ^ "Want Off Street View?". Wired. 2007-06-15. http://blog.wired.com/27bstroke6/2007/06/want_off_street.html. 
  47. ^ "Google begins blurring faces in Street View". CBS Interactive Inc. 2008-05-13. http://news.cnet.com/8301-10784_3-9943140-7.html. 
  48. ^ "See where your friends are with Google Latitude". 2009-02-04. http://googleblog.blogspot.com/2009/02/see-where-your-friends-are-with-google.html. 
  49. ^ "Privacy fears over Google tracker". BBC News. http://news.bbc.co.uk/1/hi/technology/7872026.stm. Retrieved 2009-02-16. 
  50. ^ New online Monopoly game is streets ahead | Technology | guardian.co.uk
  51. ^ a b Google Maps Terms.
  52. ^ Google Terms of Service.
  53. ^ K2climb.net - K2 and Karakorum by climbers, news
  54. ^ "Improve information in Google Maps for the world to see". www.google.com. Unknown Publish Date. http://maps.google.com/help/maps/edit/. 
  55. ^ Google LatLong: It's your world. Map it
  56. ^ "Google's View of D.C. Melds New and Sharp, Old and Fuzzy". Washington Post. 2007-07-22. http://www.washingtonpost.com/wp-dyn/content/article/2007/07/21/AR2007072101296.html. 
  57. ^ "Map of Shatoujiao that stretch across the border of Hong Kong and Shenzhen". Google Maps. http://maps.google.com/maps?ll=22.568374,114.252405&spn=0.3,0.3&t=h&q=22.568374,114.252405. Retrieved 2008-12-05. 
  58. ^ Google Maps Laona, Wisconsin
  59. ^ State of Wisconsin DNR Scattered Rice Lake
  60. ^ The Google Local map results have "merged" our listing with another in the same building - Maps Help
  61. ^ "Google Maps Merging Mania Due to Algo-Change". 2009-04-29. http://blumenthals.com/blog/2009/04/29/google-maps-merging-mania-due-to-algo-change/. 
  62. ^ New York Times, 2009-11-17 Google volunteers

[edit] External links

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