This definition references well-known EPSG CRS components. (-77.03647, 38.89763, 0).Ī formal definition of the coordinate reference system (encoded as GML) used by KML is contained in the OGC KML 2.2 Specification. (-77.03647, 38.89763) then the default value of 0 (approximately sea level) is assumed for the altitude component, i.e. If altitude is omitted from a coordinate string, e.g. Altitude, the vertical component, is measured in meters from the WGS84 EGM96 Geoid vertical datum. The longitude/latitude components (decimal degrees) are as defined by the World Geodetic System of 1984 (WGS84). Geodetic reference systems in KML įor its reference system, KML uses 3D geographic coordinates: longitude, latitude, and altitude, in that order, with negative values for west, south, and below mean sea level. The MIME type associated with KML is application/+xml the MIME type associated with KMZ is application/. By convention the root KML document is at root level and referenced files are in subdirectories (e.g. The root KML document by convention is a file named "doc.kml" at the root directory level, which is the file loaded upon opening. The contents of a KMZ file are a single root KML document (notionally "doc.kml") and optionally any overlays, images, icons, and COLLADA 3D models referenced in the KML including network-linked KML files. KML files are very often distributed as KMZ files, which are zipped KML files with a. Some KML information cannot be viewed in Google Maps or Mobile. KML shares some of the same structural grammar as Geography Markup Language (GML). Other data can make a view more specific, such as tilt, heading, or altitude, which together define a "camera view" along with a timestamp or timespan.
Every place has a longitude and a latitude. The KML file specifies a set of features (place marks, images, polygons, 3D models, textual descriptions, etc.) that can be displayed on maps in geospatial software implementing the KML encoding. Google Earth was the first program able to view and graphically edit KML files, but other projects such as Marble have added KML support. KML became an international standard of the Open Geospatial Consortium in 2008. It was created by Keyhole, Inc, which was acquired by Google in 2004. KML was developed for use with Google Earth, which was originally named Keyhole Earth Viewer. Keyhole Markup Language ( KML) is an XML notation for expressing geographic annotation and visualization within two-dimensional maps and three-dimensional Earth browsers.
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