Citizendia

Keyhole Markup Language
File name extension. A filename extension is a suffix to the name of a Computer file applied to indicate the encoding convention ( File format) of its contents kml, . kmz
Internet media typeapplication/vnd. An Internet media type, originally called a MIME type after MIME and sometimes a Content-type after the name of a header in several protocols whose value google-earth. kml+xml, application/vnd. google-earth. kmz
Developed byKeyhole, Inc., Google
Type of formatGeographic Information System
Extended fromXML

Keyhole Markup Language (KML) is an XML-based language schema for expressing geographic annotation and visualization on existing or future Web-based, two-dimensional maps and three-dimensional Earth browsers. Keyhole Inc, founded in 2001 was a pioneering software development company specializing in geospatial data visualization applications and was acquired by Google in 2004 Google Inc is an American public corporation, earning revenue from advertising related to its Internet search, e-mail, online Don't change "Extensible" Don't change "Extensible" A markup language is an Artificial language using a set of annotations to text that give instructions regarding the structure of text or how it is to be displayed The World Wide Web (commonly shortened to the Web) is a system of interlinked Hypertext documents accessed via the Internet. EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001 KML was developed for use with Google Earth, which was originally named Keyhole Earth Viewer. Google Earth is a Virtual globe program that was originally called Earth Viewer and was created by Keyhole Inc, a company acquired by Google in 2004 It was created by Keyhole, Inc, which was acquired by Google in 2004. Keyhole Inc, founded in 2001 was a pioneering software development company specializing in geospatial data visualization applications and was acquired by Google in 2004 Google Inc is an American public corporation, earning revenue from advertising related to its Internet search, e-mail, online The name "Keyhole" is an homage to the KH reconnaissance satellites, the original eye-in-the-sky military reconnaissance system first launched in 1976. The KH-11, also referenced by the codenames 1010, Crystal and Kennan, also commonly known as " Key Hole " was a type of Reconnaissance Reconnaissance (also scouting) is a military and medical term denoting exploration conducted to gain information

Contents

Structure

The KML file specifies a set of features (placemarks, images, polygons, 3D models, textual descriptions, etc. ) for display in Google Earth, Maps and Mobile, or any other 3D earth browser (geobrowser) implementing the KML encoding. Each place always has a longitude and a latitude. Longitude (ˈlɒndʒɪˌtjuːd or ˈlɒŋgɪˌtjuːd symbolized by the Greek character Lambda (λ is the east-west Geographic coordinate measurement Latitude, usually denoted symbolically by the Greek letter phi ( Φ) gives the location of a place on Earth (or other planetary body north or south of the Other data can make the view more specific, such as tilt, heading, altitude, which together define a "camera view". KML shares some of the same structural grammar as GML[1]. The Geography Markup Language ( GML) is the XML grammar defined by the Open Geospatial Consortium (OGC to express geographical features Some KML information cannot be viewed in Google Maps or Mobile [2].

KML files are very often distributed as KMZ files, which are zipped KML files with a . kmz extension. When a KMZ file is unzipped, a single "doc. kml" is found along with any overlay and icon images referenced in the KML.

Example KML document:

<?xml version="1. 0" encoding="UTF-8"?><kml xmlns="http://earth. google. com/kml/2. 0"><Placemark>  <description>New York City</description>  <name>New York City</name>  <Point>    <coordinates>-74. 006393,40. 714172,0</coordinates>  </Point></Placemark></kml>

The MIME type associated with KML is application/vnd. An Internet media type, originally called a MIME type after MIME and sometimes a Content-type after the name of a header in several protocols whose value google-earth. kml+xml; the MIME type associated with KMZ is application/vnd. google-earth. kmz.

Geodetic reference systems in KML

For its reference system, KML uses geographic coordinates (latitude and longitude) in the World Geodetic System of 1984 (WGS84). The World Geodetic System defines a reference frame for the earth for use in Geodesy and Navigation. However it does not support the general idea of the geodetic reference system, in which there are multiple coordinate systems of the Earth for which geographic coordinates could be defined. Geodetic systems or geodetic data are used in Geodesy, Navigation, Surveying by Cartographers and Satellite navigation systems

OGC standard process

The KML 2. 2 specification was submitted to the Open Geospatial Consortium to assure its status as an open standard for all geobrowsers. The Open Geospatial Consortium ( OGC) is an international voluntary consensus Standards organization. In November 2007 a new KML 2. 2 Standards Working Group was established within OGC to formalize KML 2. 2 as an OGC standard. Comments were sought on the proposed standard until January 4, 2008,[1] and it became an official OGC standard on April 14, 2008. Events 46 BC - Titus Labienus defeats Julius Caesar in the Battle of Ruspina. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 43 BC - Battle of Forum Gallorum: Mark Antony, besieging Julius Caesar 's assassin Decimus Junius Brutus in 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common [2]

Applications using KML

See also

References

  1. ^ Open Geospatial Consortium, Inc (2007-12-04). The GNU Lesser General Public License (formerly the GNU Library General Public License) or LGPL is a Free software license published by the Free Software This specification will define an Optional Package that will enable developers to write mobile location-based applications for resource limited devices CityGML is a common information model for the representation of 3D urban objects The Geography Markup Language ( GML) is the XML grammar defined by the Open Geospatial Consortium (OGC to express geographical features GPX, or GPS eXchange Format is an XML schema designed for describing GPS data between software applications A point of interest, or POI, is a specific point location that someone may find useful or interesting A waypoint is a reference point in physical space used for purposes of Navigation. COLLADA is a COLLA borative D esign A ctivity for establishing an Interchange File format for interactive 3D applications Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. "December 4th" redirects here For the song by Jay-Z, see December 4th (song. "The OGC Seeks Comment on OGC Candidate KML 2.2 Standard". Press release. A news release, media release, press release or press statement is a written or recorded Communication directed at members of the News Retrieved on 2007-12-10. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1041 - Empress Zoe of Byzantium elevates her adoptive son to the throne of the Eastern Roman Empire as Michael V
  2. ^ Shankland, Stephen (2008-04-14). 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 43 BC - Battle of Forum Gallorum: Mark Antony, besieging Julius Caesar 's assassin Decimus Junius Brutus in Google mapping spec now an industry standard. CNET. CNET Networks Inc is a media company based in San Francisco California, United States, and is part of CBS Interactive, owned Retrieved on 2008-04-14. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 43 BC - Battle of Forum Gallorum: Mark Antony, besieging Julius Caesar 's assassin Decimus Junius Brutus in

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