KML. 1) Overview 2) Downloads3) Official Schemas4) Revision Working Group 5) Related News 1) Overview Google submitted KML (formerly Keyhole Markup Language) to the Open Geospatial Consortium (OGC) to be evolved within the OGC consensus process with the following goal: KML Version 2.2 has been adopted as an OGC implementation standard. Future versions may be harmonized with relevant OGC standards that comprise the OGC standards baseline. There are four objectives for this standards work: That there be one international standard language for expressing geographic annotation and visualization on existing or future web-based online and mobile maps (2d) and earth browsers (3d).
The OGC has developed a broad Standards Baseline. KML is an XML language focused on geographic visualization, including annotation of maps and images. The OGC and Google have agreed that there can be additional harmonization of KML with GML (e.g. to use the same geometry representation) in the future. 2) Downloads. Ogle Earth | Notes on the political and scientific impact of digital maps and geospatial imagery. Google Earth Blog - The amazing things about Google Earth.
A Quick Tour of KML: Geographic Visualization for the Web | KML: An International Standard. Just as web browsers read and display HTML files, Earth browsers such as Google Earth read and display KML files. Learn what KML is and how you can create a simple KML file yourself. After reading this chapter, you’ll be able to do the following: Give a simple definition of KML in layman’s terms. List four possible use cases for a KML presentation. KML (Keyhole Markup Language) is an XML data format used to display information in a geographic context.
As Michael T. A Quick Tour of KML: Geographic Visualization for the Web | KML: An International Standard. KML Reference - Keyhole Markup Language. This section contains an alphabetical reference for all KML elements defined in KML Version 2.2, as well as elements in the Google extension namespace. The class tree for KML elements is shown below. In this diagram, elements to the right on a particular branch in the tree are extensions of the elements to their left. For example, Placemark is a special kind of Feature. It contains all of the elements that belong to Feature, and it adds some elements that are specific to the Placemark element. KML is an open standard officially named the OpenGIS® KML Encoding Standard (OGC KML). The complete XML schema for KML is located at Note: Click an element name in this diagram to jump to its entry in the reference section. Note that abstract elements (shown in boxes in the diagram) are not actually used in KML files.
All elements derived from Object can have an id assigned to them. Tip: Viewing KML for Google Earth Features Compatibility About this reference KML fields. Sky Data in KML - Keyhole Markup Language. You can now create KML files that display objects in the sky, such as stars, constellations, planets, the Earth's moon, and galaxies. This page explains how to create a KML file to display celestial data in Google Sky. Specifically, you'll need to do the following: Add a hint attribute to the <kml> element at the beginning of your KML file that indicates the file contains sky data, not Earth data Convert celestial coordinates to Earth-based KML coordinates The Google Earth user can control when to switch to Sky mode, using the View > Switch to Sky menu option or the Sky button in the user interface.
When the user switches to Sky mode, Google Earth transitions to show images of the sky photographed from telescopes around the world and inouter space. The view of the sky is as if the user is standing at the center of the Earth, looking outward toward the heavens. Coordinates Celestial coordinates are described in terms of right ascension (RA) and declination. Supported Elements where r k α β. Excel To KML. Western United States only, in a number of formats. Used in place of Latitude and Longitude or Position. The Quarter/Quarter closest to our example position 39° 18' 40.58" N 102° 17' 30.47" W is the SE 1/4 of the NW 1/4 of Section 35, Range 44 West, Township 8 South, Sixth Meridian, Colorado. Verbose, forward and reversed SE 1/4 of the NW 1/4 of Section 35, Range 44 West, Township 8 South, Sixth Meridian, Colorado Colorado, Sixth Meridian, Township 8 South, Range 44 West, Section 35, SE 1/4 of the NW 1/4 Abbreviated, forward and reversed SENW 35 44W 8S 6th CO CO 6th 8S 44W 35 SENW If there is no possibility of duplication, the state or the meridian can be dropped.
However, some states have more that one meridian, for example California has three. Likewise, a single meridian can cross into more than one state, causing duplication along the border. Street View – Mapy Google.