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<div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Altitude</span> </div> </a> <ul id="toc-Altitude-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Uncertainty" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Uncertainty"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Uncertainty</span> </div> </a> <ul id="toc-Uncertainty-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Unofficial_extensions" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Unofficial_extensions"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Unofficial extensions</span> </div> </a> <ul id="toc-Unofficial_extensions-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> 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.sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><table class="sidebar sidebar-collapse nomobile nowraplinks"><tbody><tr><th class="sidebar-title" style="padding-bottom:0.4em;"><a href="/wiki/Geodesy" title="Geodesy">Geodesy</a></th></tr><tr><td class="sidebar-image"><span typeof="mw:File"><a href="/wiki/File:Globe_Atlantic.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Globe_Atlantic.svg/120px-Globe_Atlantic.svg.png" decoding="async" width="120" height="121" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Globe_Atlantic.svg/180px-Globe_Atlantic.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Globe_Atlantic.svg/240px-Globe_Atlantic.svg.png 2x" data-file-width="717" data-file-height="721" /></a></span></td></tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Fundamentals</div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Geodesy" title="Geodesy">Geodesy</a></li> <li><a href="/wiki/Geodynamics" title="Geodynamics">Geodynamics</a></li> <li><a href="/wiki/Geomatics" title="Geomatics">Geomatics</a></li> <li><a href="/wiki/History_of_geodesy" title="History of geodesy">History</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Concepts</div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Geographical_distance" title="Geographical distance">Geographical distance</a></li> <li><a href="/wiki/Geoid" title="Geoid">Geoid</a></li> <li><a href="/wiki/Figure_of_the_Earth" title="Figure of the Earth">Figure of the Earth</a> <small>(<a href="/wiki/Earth_radius" title="Earth radius">radius</a> and <a href="/wiki/Earth%27s_circumference" title="Earth's circumference">circumference</a>)</small></li> <li><a href="/wiki/Geodetic_coordinates" title="Geodetic coordinates">Geodetic coordinates</a></li> <li><a href="/wiki/Geodetic_datum" title="Geodetic datum">Geodetic datum</a></li> <li><a href="/wiki/Geodesic" title="Geodesic">Geodesic</a></li> <li><a href="/wiki/Horizontal_position_representation" title="Horizontal position representation">Horizontal position representation</a></li> <li><span class="nowrap"><a href="/wiki/Latitude" title="Latitude">Latitude</a> / <a href="/wiki/Longitude" title="Longitude">Longitude</a></span></li> <li><a href="/wiki/Map_projection" title="Map projection">Map projection</a></li> <li><a href="/wiki/Reference_ellipsoid" class="mw-redirect" title="Reference ellipsoid">Reference ellipsoid</a></li> <li><a href="/wiki/Satellite_geodesy" title="Satellite geodesy">Satellite geodesy</a></li> <li><a href="/wiki/Spatial_reference_system" title="Spatial reference system">Spatial reference system</a></li> <li><a href="/wiki/Spatial_relation" title="Spatial relation">Spatial relations</a></li> <li><a href="/wiki/Vertical_position" title="Vertical position">Vertical positions</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Technologies</div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Satellite_navigation" title="Satellite navigation">Global Nav. Sat. Systems (GNSSs)</a></li> <li><a href="/wiki/Global_Positioning_System" title="Global Positioning System">Global Pos. System (GPS)</a></li> <li><a href="/wiki/GLONASS" title="GLONASS">GLONASS <span style="font-size:85%;">(Russia)</span></a></li> <li><a href="/wiki/BeiDou" title="BeiDou">BeiDou (BDS) <span style="font-size:85%;">(China)</span></a></li> <li><a href="/wiki/Galileo_(satellite_navigation)" title="Galileo (satellite navigation)">Galileo <span style="font-size:85%;">(Europe)</span></a></li> <li><a href="/wiki/Indian_Regional_Navigation_Satellite_System" title="Indian Regional Navigation Satellite System">NAVIC <span style="font-size:85%;">(India)</span></a></li> <li><a href="/wiki/Quasi-Zenith_Satellite_System" title="Quasi-Zenith Satellite System">Quasi-Zenith Sat. Sys. (QZSS) <span style="font-size:85%;">(Japan)</span></a></li> <li><a href="/wiki/Discrete_Global_Grid" class="mw-redirect" title="Discrete Global Grid">Discrete Global Grid and Geocoding</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed plainlist"><div class="sidebar-list-title" style="color: var(--color-base)">Standards (history)</div><div class="sidebar-list-content mw-collapsible-content hlist"><table class="nowrap" style="width:100%;border-collapse:collapse;border-spacing:0px 0px;border:none;line-height:1.2em;"><tbody><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/Sea_Level_Datum_of_1929" class="mw-redirect" title="Sea Level Datum of 1929">NGVD 29</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Sea Level Datum 1929</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/OSGB36" class="mw-redirect" title="OSGB36">OSGB36</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Ordnance Survey Great Britain 1936</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/SK-42_reference_system" title="SK-42 reference system">SK-42</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Systema Koordinat 1942 goda</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/ED50" title="ED50">ED50</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> European Datum 1950</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/South_American_Datum#SAD69" title="South American Datum">SAD69</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> South American Datum 1969</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/GRS_80" class="mw-redirect" title="GRS 80">GRS 80</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Geodetic Reference System 1980</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/ISO_6709" title="ISO 6709">ISO 6709</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Geographic point coord. 1983</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/North_American_Datum#North_American_Datum_of_1983" title="North American Datum">NAD 83</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> North American Datum 1983</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/World_Geodetic_System" title="World Geodetic System">WGS 84</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> World Geodetic System 1984</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/North_American_Vertical_Datum_of_1988" title="North American Vertical Datum of 1988">NAVD 88</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> N. American Vertical Datum 1988</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/European_Terrestrial_Reference_System_1989" title="European Terrestrial Reference System 1989">ETRS89</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> European Terrestrial Ref. Sys. 1989</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a href="/wiki/Restrictions_on_geographic_data_in_China" title="Restrictions on geographic data in China">GCJ-02</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Chinese obfuscated datum 2002</td></tr><tr style="vertical-align:top"><td style="text-align:left;padding-left:0.5em;"> <a class="mw-selflink selflink">Geo URI</a></td><td style="text-align:right;font-size:90%;padding-right:0.55em;"> Internet link to a point 2010</td></tr></tbody></table> <ul><li><a href="/wiki/International_Terrestrial_Reference_System" class="mw-redirect" title="International Terrestrial Reference System">International Terrestrial Reference System</a></li> <li><a href="/wiki/SRID" class="mw-redirect" title="SRID">Spatial Reference System Identifier (SRID)</a></li> <li><a href="/wiki/Universal_Transverse_Mercator_coordinate_system" title="Universal Transverse Mercator coordinate system">Universal Transverse Mercator (UTM)</a></li></ul></div></div></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Geodesy" title="Template:Geodesy"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Geodesy" title="Template talk:Geodesy"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Geodesy" title="Special:EditPage/Template:Geodesy"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <p>The <b>geo URI scheme</b> is a <a href="/wiki/Uniform_Resource_Identifier" title="Uniform Resource Identifier">Uniform Resource Identifier</a> (URI) scheme defined by the <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">Internet Engineering Task Force</a>'s RFC 5870 (published 8 June 2010)<sup id="cite_ref-RFC5870_1-0" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> as: </p> <blockquote><p>a Uniform Resource Identifier (URI) for geographic locations using the 'geo' <a href="/wiki/URI_scheme" class="mw-redirect" title="URI scheme">scheme name</a>. A 'geo' URI identifies a physical location in a two- or three-dimensional <a href="/wiki/Spatial_referencing_system" class="mw-redirect" title="Spatial referencing system">coordinate reference system</a> in a compact, simple, human-readable, and <a href="/wiki/Communications_protocol" class="mw-redirect" title="Communications protocol">protocol</a>-independent way.<sup id="cite_ref-RFC5870_1-1" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></p></blockquote> <p>The current revision of the <a href="/wiki/VCard" title="VCard">vCard</a> specification<sup id="cite_ref-RFC6350_2-0" class="reference"><a href="#cite_note-RFC6350-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> supports geo URIs in a vCard's "GEO" property, and the <a href="/wiki/GeoSMS" title="GeoSMS">GeoSMS</a> standard uses geo URIs for <a href="/wiki/Geotagging" title="Geotagging">geotagging</a> SMS messages. <a href="/wiki/Android_(operating_system)" title="Android (operating system)">Android</a> based devices support geo URIs,<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> although that implementation is based on a draft revision of the specification, and supports a different set of URI parameters and query strings. </p><p>A geo URI is not to be confused with the former website of <i>GeoURL</i><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> (which had implemented <a href="/wiki/ICBM_address" title="ICBM address">ICBM addresses</a>). </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Example">Example</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=1" title="Edit section: Example"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A simple geo URI might look like: </p> <dl><dd><code><a rel="nofollow" class="external free" href="geo:25.245470718844146,51.45400942457904">geo:25.245470718844146,51.45400942457904</a></code></dd></dl> <p>where the two numerical values represent <a href="/wiki/Latitude" title="Latitude">latitude</a> and <a href="/wiki/Longitude" title="Longitude">longitude</a> respectively,<sup id="cite_ref-RFC5870_1-2" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> and are separated by a <a href="/wiki/Comma" title="Comma">comma</a>.<sup id="cite_ref-RFC5870_1-3" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> They are coordinates of a <a href="/wiki/Horizontal_position_representation" title="Horizontal position representation">horizontal grid</a> (2D). If a third comma-separated value is present, it represents <a href="/wiki/Altitude" title="Altitude">altitude</a>;<sup id="cite_ref-RFC5870_1-4" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> so, coordinates of a 3D grid. Coordinates in the Southern and Western hemispheres as well as altitudes below the coordinate reference system (depths) are signed negative with a leading dash.<sup id="cite_ref-RFC5870_1-5" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>The geo URI also allows for an optional "uncertainty" value, separated by a <a href="/wiki/Semicolon" title="Semicolon">semicolon</a>, representing the uncertainty of the location in meters, and is described using the "u" URI parameter.<sup id="cite_ref-RFC5870_1-6" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> A geo URI with an uncertainty parameter looks as follows: </p> <dl><dd><code><a rel="nofollow" class="external free" href="geo:37.786971,-122.399677;u=35">geo:37.786971,-122.399677;u=35</a></code></dd></dl> <p>A geo URI may, for example, be included on a web page, as <a href="/wiki/HTML" title="HTML">HTML</a>: </p> <dl><dd><code><a href="<a rel="nofollow" class="external free" href="geo:37.786971,-122.399677;u=35">geo:37.786971,-122.399677;u=35</a>">Wikimedia Headquarters</a></code></dd></dl> <p>so that a geo URI-aware <a href="/wiki/User_agent" title="User agent">user agent</a> such as a <a href="/wiki/Web_browser" title="Web browser">web browser</a> could launch the user's chosen mapping service; or it could be used in an <a href="/wiki/Atom_(standard)" class="mw-redirect" title="Atom (standard)">Atom</a> feed or other <a href="/wiki/XML" title="XML">XML</a> file. </p> <div class="mw-heading mw-heading2"><h2 id="Coordinate_reference_systems">Coordinate reference systems</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=2" title="Edit section: Coordinate reference systems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The values of the coordinates only make sense when a <a href="/wiki/Coordinate_reference_system" class="mw-redirect" title="Coordinate reference system">coordinate reference system</a> (CRS) is specified. The default CRS is the <a href="/wiki/World_Geodetic_System" title="World Geodetic System">World Geodetic System 1984</a> (WGS-84),<sup id="cite_ref-RFC5870_1-7" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> and it is not recommended to use any other: </p> <style data-mw-deduplicate="TemplateStyles:r1244412712">.mw-parser-output .templatequote{overflow:hidden;margin:1em 0;padding:0 32px}.mw-parser-output .templatequotecite{line-height:1.5em;text-align:left;margin-top:0}@media(min-width:500px){.mw-parser-output .templatequotecite{padding-left:1.6em}}</style><blockquote class="templatequote"><p> The optional 'crs' URI parameter described below may be used by future specifications to define the use of CRSes other than WGS-84. This is primarily intended to cope with the case of another CRS replacing WGS-84 as the predominantly used one, rather than allowing the arbitrary use of thousands of CRSes for the URI (which would clearly affect interoperability).<sup id="cite_ref-RFC5870_1-8" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p></blockquote> <p>The only justified use of other CRS today is, perhaps, to preserve projection in <a href="/wiki/Scale_(map)#Large-scale_maps_with_curvature_neglected" title="Scale (map)">large-scale maps</a>, as local <a href="/wiki/Universal_Transverse_Mercator_coordinate_system" title="Universal Transverse Mercator coordinate system">UTM</a>, or for non-terrestrial coordinates such as those on <a href="/wiki/Moon" title="Moon">the Moon</a> or <a href="/wiki/Mars" title="Mars">Mars</a>. The syntax and semantic of the CRS parameter, separated by a semicolon, is described at section 8.3 of RFC 5870. Examples: </p> <ul><li>The <a href="/wiki/Washington_Monument" title="Washington Monument">Washington Monument</a>'s location expressed with <a href="/wiki/Universal_Transverse_Mercator_coordinate_system#UTM_zone" title="Universal Transverse Mercator coordinate system">UTM-zone 18N</a> and its <a rel="nofollow" class="external text" href="https://spatialreference.org/ref/epsg/32618/">standard ID</a>: <dl><dd><code><a rel="nofollow" class="external free" href="geo:323482,4306480;crs=EPSG:32618;u=20">geo:323482,4306480;crs=EPSG:32618;u=20</a></code></dd></dl></li> <li>A geo URI for a hypothetical lunar CRS created in 2011 might be: <dl><dd><code><a rel="nofollow" class="external free" href="geo:37.786971,-122.399677;crs=Moon-2011;u=35">geo:37.786971,-122.399677;crs=Moon-2011;u=35</a></code></dd></dl></li></ul> <p>The order in which the semicolon-separated parameters occur is partially significant.<sup id="cite_ref-RFC5870_1-9" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Whilst the labeltext parameter and future parameters may be given in any order, the <code>crs</code> and the <code>u</code> parameters must come first. If both are used, the <code>crs</code> must precede the <code>u</code>.<sup id="cite_ref-RFC5870_1-10" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> All parameters are <a href="/wiki/Case_sensitivity" title="Case sensitivity">case-insensitive</a>,<sup id="cite_ref-RFC5870_1-11" class="reference"><a href="#cite_note-RFC5870-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> so, imagining a future new parameter <code>mapcolors</code>, it can be ignored by simpler applications, and the above example is exactly equivalent to: </p> <dl><dd><code><a rel="nofollow" class="external free" href="geo:323482,4306480;CRS=epsg:32718;U=20;mapcolors=for_daltonic">geo:323482,4306480;CRS=epsg:32718;U=20;mapcolors=for_daltonic</a></code></dd></dl> <p>The use of the lowercase representation of parameter names (<code>crs</code> <code>u</code> and <code>mapcolors</code>) is preferred. </p> <div class="mw-heading mw-heading2"><h2 id="Semantics_and_usual_interpretations">Semantics and usual interpretations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=3" title="Edit section: Semantics and usual interpretations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Geo URI scheme semantics, expressed in the section 3.4 of the RFC 5870, is not explicit about some mathematical assumptions, so it is open to interpretation. After ~10 years of its publication, there are some consensual or "most frequently used" assumptions. </p> <div class="mw-heading mw-heading3"><h3 id="Altitude">Altitude</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=4" title="Edit section: Altitude"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Geoida.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/00/Geoida.svg/220px-Geoida.svg.png" decoding="async" width="220" height="102" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/00/Geoida.svg/330px-Geoida.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/00/Geoida.svg/440px-Geoida.svg.png 2x" data-file-width="730" data-file-height="338" /></a><figcaption> 1. Ocean<br /> 2. <a href="/wiki/Reference_ellipsoid" class="mw-redirect" title="Reference ellipsoid">Reference ellipsoid</a><br /> 3. Local plumb line<br /> 4. Continent<br /> 5. Geoid</figcaption></figure> <p>The syntax of the Geo UI defines coordinates as <code>coordinates = coord-a "," coord-b [ "," coord-c ]</code>, where <code>coord-c</code> is optional. The semantic of <code>coord-c</code> for <a href="/wiki/World_Geodetic_System" title="World Geodetic System">WGS-84</a> is <a href="/wiki/Altitude" title="Altitude">altitude</a> in meters (specifically the "ground <a href="/wiki/Elevation" title="Elevation">elevation</a>", relative to the current <a href="/wiki/Geoid" title="Geoid">geoid</a> – <a href="/wiki/Earth_Gravitational_Model" title="Earth Gravitational Model">Earth Gravitational Model</a> – attached to WGS84),<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> and the concept is extended for other coordinates (of non-default CRS). </p><p>The RFC explains that <i>"... undefined <altitude> MAY assume that the URI refers to the respective location on Earth's physical surface."</i> However, <i>"... an <altitude> value of 0 MUST NOT be mistaken to refer to 'ground elevation'"</i>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p><p>In other words, when an altitude is defined, the measurement is done relative to the geoid (#5; black line in the image), a surface defined by Earth's gravity approximating the <a href="/wiki/Mean_sea_level" class="mw-redirect" title="Mean sea level">mean sea level</a>. When it is undefined, the elevation is assumed to be the altitude of the latitude-longitude point, that is its height (or negative depth) relative to the geoid (i.e. "ground elevation"). A point with a measure "altitude=0" is, however, not to be confused with an undefined value: it refers to an altitude of 0 meters above the geoid. </p><p>The use of a geoid stands in contrast to <a href="/wiki/GeoJSON" title="GeoJSON">GeoJSON</a>, which uses direct ellipsoid height.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Uncertainty">Uncertainty</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=5" title="Edit section: Uncertainty"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-Technical plainlinks metadata ambox ambox-style ambox-technical" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/40px-Edit-clear.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/60px-Edit-clear.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/80px-Edit-clear.svg.png 2x" data-file-width="48" data-file-height="48" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section <b>may be too technical for most readers to understand</b>.<span class="hide-when-compact"> Please <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Geo_URI_scheme&action=edit">help improve it</a> to <a href="/wiki/Wikipedia:Make_technical_articles_understandable" title="Wikipedia:Make technical articles understandable">make it understandable to non-experts</a>, without removing the technical details.</span> <span class="date-container"><i>(<span class="date">May 2019</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Accuracy_and_precision.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/Accuracy_and_precision.svg/300px-Accuracy_and_precision.svg.png" decoding="async" width="300" height="162" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/Accuracy_and_precision.svg/450px-Accuracy_and_precision.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/38/Accuracy_and_precision.svg/600px-Accuracy_and_precision.svg.png 2x" data-file-width="520" data-file-height="280" /></a><figcaption>Facets of the uncertainty. According to <a href="/wiki/Accuracy_and_precision#ISO_definition_(ISO_5725)" title="Accuracy and precision">ISO 5725-1</a>: <i>accuracy</i> is the proximity of measurement results to the true value; <i>precision</i> is the degree to which <a href="/wiki/Repeatability" title="Repeatability">repeated</a> (or <a href="/wiki/Reproducibility" title="Reproducibility">reproducible</a>) measurements under unchanged conditions show the same results.</figcaption></figure><p> Remembering the example above, </p><dl><dd><code>geo:37.786971,-122.399677;u=35</code></dd></dl> <p>The <code>u=35</code> part informs the uncertainty. As will be showed, geometrically the uncertainty is a disc of radius <code>u</code> in turn of the point of the geo URI. </p><p>Geo URI is not about exact abstract positions, strictly it is a <a href="/wiki/Location_estimation_in_sensor_networks" title="Location estimation in sensor networks">location estimate</a>, and we can interpret it (from RFC 5870 and RFC 5491) as the approximate physical position of an object in the Earth's surface. </p><p>The RFC 5870 does not formalize the use of the "<a href="/wiki/Measurement_uncertainty" title="Measurement uncertainty"><i>uncertainty</i></a>" term. So, in a coarse-statistical or any non-statistical <a href="/wiki/Numerical_analysis" title="Numerical analysis">numerical analysis</a>, the <i>GeoURI uncertainty</i> is a <a href="/wiki/Condition_number" title="Condition number">condition number</a>. The statistical meaning is implicit, come from the references of the RFC: the only normative reference with something about <i>uncertainty</i> is the <a rel="nofollow" class="external text" href="https://tools.ietf.org/html/rfc5491#section-5">RFC 5491 (section 5)</a>. The main informative reference, <a href="/wiki/ISO_6709" title="ISO 6709">ISO 6709:2008</a>, not use the term "uncertainty", but use the terms "accuracy" and "precision", which are uncertainty facets and can be interpreted in accordance with ISO 5725-1 (illustrated). </p><p>Putting all together, adopting these clues, the usual statistical assumptions, and the explicit definitions of the RFC, we obtain the Geo URI's <i>uncertainty</i> mathematical properties: </p> <ol><li>uncertainty is symmetric: the RFC is explicit, and we can understand it as valid simplification hypothesis. <i>"The single uncertainty value is applied to all dimensions given in the URI"</i> (section 3.4.3). Results in a spherical volume around the point (or a disk by 2D projection).<br />By RFC 5491 "locations are expressed as a point (...) and an area or volume of uncertainty around the point". <ul><li>Using RFC 5491, we can suppose that <i>"It is RECOMMENDED that uncertainty is expressed at a confidence of 95% or higher"</i>. Therefore, the uncertainty is two standard deviations, 2σ, and it is the radius of the disk that represents uncertainty geometrically.</li></ul></li> <li>fixed measure unit: the RFC obligate the use of <a href="/wiki/Metre" title="Metre">meters</a> as <i>uncertainty</i> measure units, even when coordinates (CRS) use other (like default that is decimal degrees). It is a semantic and a conversion problem: the</li> <li>Gaussian error model: RFC say nothing, we interpreting the phrases "amount of uncertainty in the location" and "the uncertainty with which the identified location of the subject is known", all in the context of the normative reference, RFC 5491 (and the informative references like <a href="/wiki/ISO_6709" title="ISO 6709">ISO 6709:2008</a>). <ul><li>adopting <a href="/wiki/Standard_error" title="Standard error">standard error model</a>: the model of the most common <a href="/wiki/Descriptive_statistics" title="Descriptive statistics">descriptive statistics modeling</a>.</li> <li>It is imposed, is independent of <a href="/wiki/Model_selection" title="Model selection">selection process</a> of <i>uncertainty</i> description, there are no other choices.</li></ul></li> <li>total uncertainty: it is only one parameter representing "all uncertainty", the uncertainty in the spatial measure and uncertainty about object definition or object's center. It is a <a href="/wiki/Standard_deviation#Identities_and_mathematical_properties" title="Standard deviation">sum of random variables</a>. There is no simplification hypothesis defined to reduce it to a one-variable model.</li></ol> <p>Imagining the location of an <a href="/wiki/Ant_colony" title="Ant colony">ant colony</a> to illustrate: </p> <ul><li>the colony is a 3D object at the (exactly) the <a href="/wiki/Terrain" title="Terrain">Terrain surface</a>, so at precise altitude (approximated to a zero uncertainty measure).</li> <li>the 3D object has some consensual definition, but it is not precise, so, its uncertainty can not be neglected. This lack of precision can be about the fact that the anthill is hidden under the ground (it is an "estimated object"), or the formal definition of its delimitation, etc.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> This kind of uncertainty has no correlation with the location (e.g. GPS) uncertainty measure. <ul><li>the disk representing the anthill (as uncertainty of the object) is modeled as 2σ to be a 95% of confidence area.</li></ul></li> <li>the point is a <a href="/wiki/GPS_navigation_device" class="mw-redirect" title="GPS navigation device">GPS</a> location measure, that is, the "center" of the projection of the 3D object in the 2D surface.</li></ul> <p>The total uncertainty is the sum of GPS error and object-definition error. The latitude and longitude GPS errors need to be simplified (to a disk) and converted into meters. If the errors were inferred from a different model, they need to be converted to the Gaussian model. </p> <div class="mw-heading mw-heading2"><h2 id="Unofficial_extensions">Unofficial extensions</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=6" title="Edit section: Unofficial extensions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Some vendors, such as <a href="/wiki/Android_OS" class="mw-redirect" title="Android OS">Android OS</a>, have adopted extensions to the "geo" URI scheme:<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <ul><li><b>z</b>: Zoom level for <a href="/wiki/Web_Mercator_projection" title="Web Mercator projection">Web Mercator projection</a> scaling. The value is an integer from 1 to 21.</li> <li><b>q</b>: Perform a search for the keyword given around the point. If the location is given as "0,0", search around the current position. A parenthetical can be used to indicate the label to show on the map.</li></ul> <p><a href="/wiki/Google_Maps" title="Google Maps">Google Maps</a> adopts an unconventional approach to displaying the points: it shows the map for, but does not display a map pin, when a location is given in the standard way. A pin only shows up when given as the query. In other words, to show a pin at the <a href="/wiki/Wikimedia_Foundation" title="Wikimedia Foundation">Wikimedia Foundation</a> office, one should not use <code><a rel="nofollow" class="external free" href="geo:37.78918,-122.40335">geo:37.78918,-122.40335</a></code> but <code><a rel="nofollow" class="external free" href="geo:0,0?q=37.78918,-122.40335">geo:0,0?q=37.78918,-122.40335</a></code>. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=7" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/LOC_record" title="LOC record">LOC record</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=8" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-RFC5870-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-RFC5870_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-RFC5870_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-RFC5870_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-RFC5870_1-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-RFC5870_1-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-RFC5870_1-5"><sup><i><b>f</b></i></sup></a> <a href="#cite_ref-RFC5870_1-6"><sup><i><b>g</b></i></sup></a> <a href="#cite_ref-RFC5870_1-7"><sup><i><b>h</b></i></sup></a> <a href="#cite_ref-RFC5870_1-8"><sup><i><b>i</b></i></sup></a> <a href="#cite_ref-RFC5870_1-9"><sup><i><b>j</b></i></sup></a> <a href="#cite_ref-RFC5870_1-10"><sup><i><b>k</b></i></sup></a> <a href="#cite_ref-RFC5870_1-11"><sup><i><b>l</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFSpanringMayrhofer2010" class="citation web cs1">Spanring, Christian; Mayrhofer, Alexander (2010-06-08). <a rel="nofollow" class="external text" href="http://tools.ietf.org/html/rfc5870">"RFC 5870 - A Uniform Resource Identifier for Geographic Locations (geo URI)"</a>. Internet Engineering Task Force<span class="reference-accessdate">. Retrieved <span class="nowrap">9 June</span> 2010</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=RFC+5870+-+A+Uniform+Resource+Identifier+for+Geographic+Locations+%28geo+URI%29&rft.pub=Internet+Engineering+Task+Force&rft.date=2010-06-08&rft.aulast=Spanring&rft.aufirst=Christian&rft.au=Mayrhofer%2C+Alexander&rft_id=http%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc5870&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGeo+URI+scheme" class="Z3988"></span></span> </li> <li id="cite_note-RFC6350-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-RFC6350_2-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPerreault2011" class="citation web cs1">Perreault, Simon (2011-08-11). <a rel="nofollow" class="external text" href="http://tools.ietf.org/html/rfc6350">"RFC 6350 - vCard Format Specification"</a>. Internet Engineering Task Force<span class="reference-accessdate">. Retrieved <span class="nowrap">19 Jun</span> 2012</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=RFC+6350+-+vCard+Format+Specification&rft.pub=Internet+Engineering+Task+Force&rft.date=2011-08-11&rft.aulast=Perreault&rft.aufirst=Simon&rft_id=http%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc6350&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGeo+URI+scheme" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://developer.android.com/guide/appendix/g-app-intents.html">"Android Intents List"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2012-06-19</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Android+Intents+List&rft_id=http%3A%2F%2Fdeveloper.android.com%2Fguide%2Fappendix%2Fg-app-intents.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGeo+URI+scheme" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20131203052543/http://geourl.org:80/">"GeoURL (2.0) The GeoURL ICBM Address Server"</a>. Geourl.org. Archived from <a rel="nofollow" class="external text" href="http://geourl.org/">the original</a> on 2013-12-03<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-12-24</span></span>. <q>GeoURL is a location-to-URL reverse directory. This will allow you to find URLs by their proximity to a given location. Find your neighbor's blog, perhaps, or the web page of the restaurants near you. GeoURL is listing 9,601,000 sites. Add yourself to the database.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=GeoURL+%282.0%29+The+GeoURL+ICBM+Address+Server&rft.pub=Geourl.org&rft_id=http%3A%2F%2Fgeourl.org%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGeo+URI+scheme" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text">Section 2 of RFC 5870.</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text">Section 3.4.5 of RFC 5870.</span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text">Section 4, <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/RFC_(identifier)" class="mw-redirect" title="RFC (identifier)">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc7946">7946</a> – The GeoJSON Format.</span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"> Using RFC 5491, that expressed that <i>"... in theory, the area or volume represents a coverage in which the user has a relatively high probability of being found, and the point is a convenient means of defining the centroid for the area or volume"</i> we can use also the concept <a href="/wiki/Home_range" title="Home range">home range</a> of the ants or the ant's queen, to define the anthill.</span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://developers.google.com/maps/documentation/urls/android-intents">"Google Maps Intents for Android | Maps URLs"</a>. <i>Google Developers</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Google+Developers&rft.atitle=Google+Maps+Intents+for+Android+%7C+Maps+URLs&rft_id=https%3A%2F%2Fdevelopers.google.com%2Fmaps%2Fdocumentation%2Furls%2Fandroid-intents&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGeo+URI+scheme" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://developer.android.com/guide/components/intents-common#Maps">"Common Intents (Maps)"</a>. <i>Android Developers</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Android+Developers&rft.atitle=Common+Intents+%28Maps%29&rft_id=https%3A%2F%2Fdeveloper.android.com%2Fguide%2Fcomponents%2Fintents-common%23Maps&rfr_id=info%3Asid%2Fen.wikipedia.org%3AGeo+URI+scheme" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Geo_URI_scheme&action=edit&section=9" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc5870">RFC5870</a></li> <li><a rel="nofollow" class="external text" href="https://geouri.org/">Geo URI</a> website</li></ul> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output .navbox-title,.mw-parser-output .navbox-abovebelow{padding:0.25em 1em;line-height:1.5em;text-align:center}.mw-parser-output .navbox-group{white-space:nowrap;text-align:right}.mw-parser-output .navbox,.mw-parser-output .navbox-subgroup{background-color:#fdfdfd}.mw-parser-output .navbox-list{line-height:1.5em;border-color:#fdfdfd}.mw-parser-output .navbox-list-with-group{text-align:left;border-left-width:2px;border-left-style:solid}.mw-parser-output tr+tr>.navbox-abovebelow,.mw-parser-output tr+tr>.navbox-group,.mw-parser-output tr+tr>.navbox-image,.mw-parser-output tr+tr>.navbox-list{border-top:2px solid #fdfdfd}.mw-parser-output .navbox-title{background-color:#ccf}.mw-parser-output .navbox-abovebelow,.mw-parser-output .navbox-group,.mw-parser-output .navbox-subgroup .navbox-title{background-color:#ddf}.mw-parser-output .navbox-subgroup .navbox-group,.mw-parser-output .navbox-subgroup .navbox-abovebelow{background-color:#e6e6ff}.mw-parser-output .navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Uniform_Resource_Identifier_(URI)_schemes" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:URI_schemes" title="Template:URI schemes"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:URI_schemes" title="Template talk:URI schemes"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:URI_schemes" title="Special:EditPage/Template:URI schemes"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Uniform_Resource_Identifier_(URI)_schemes" style="font-size:114%;margin:0 4em"><a href="/wiki/List_of_URI_schemes" title="List of URI schemes">Uniform Resource Identifier (URI) schemes</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Official</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/About_URI_scheme" title="About URI scheme">about</a></li> <li><a href="/wiki/Acct_URI_scheme" title="Acct URI scheme">acct</a></li> <li><a href="/wiki/Content_reference_identifier" title="Content reference identifier">crid</a></li> <li><a href="/wiki/Data_URI_scheme" title="Data URI scheme">data</a></li> <li><a href="/wiki/File_URI_scheme" title="File URI scheme">file</a></li> <li><a href="/wiki/File_Transfer_Protocol" title="File Transfer Protocol">ftp</a></li> <li><a class="mw-selflink selflink">geo</a></li> <li><a href="/wiki/Gopher_(protocol)" title="Gopher (protocol)">gopher</a></li> <li><a href="/wiki/HTTP#Technical_overview" title="HTTP">http</a></li> <li><a href="/wiki/HTTPS" title="HTTPS">https</a></li> <li><a href="/wiki/Info_URI_scheme" title="Info URI scheme">info</a></li> <li><a href="/wiki/Lightweight_Directory_Access_Protocol#URI_scheme" title="Lightweight Directory Access Protocol">ldap</a></li> <li><a href="/wiki/Mailto" title="Mailto">mailto</a></li> <li><a href="/wiki/Network_File_System" title="Network File System">nfs</a></li> <li><a href="/wiki/Network_News_Transfer_Protocol" title="Network News Transfer Protocol">nntp</a></li> <li><a href="/wiki/SIP_URI_scheme" title="SIP URI scheme">sip / sips</a></li> <li><a href="/wiki/Tag_URI_scheme" title="Tag URI scheme">tag</a></li> <li><a href="/wiki/Telnet" title="Telnet">telnet</a></li> <li><a href="/wiki/Uniform_Resource_Name" title="Uniform Resource Name">urn</a></li> <li><a href="/wiki/View-source_URI_scheme" title="View-source URI scheme">view-source</a></li> <li><a href="/wiki/WebSocket#Overview" title="WebSocket">ws / wss</a></li> <li><a href="/wiki/XMPP" title="XMPP">xmpp</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Unofficial</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Hyper_Text_Coffee_Pot_Control_Protocol#Commands_and_replies" title="Hyper Text Coffee Pot Control Protocol">coffee</a></li> <li><a href="/wiki/Ed2k_URI_scheme" title="Ed2k URI scheme">ed2k</a></li> <li><a href="/wiki/Gemini_(protocol)" title="Gemini (protocol)">gemini</a></li> <li><a href="/wiki/Feed_URI_scheme" title="Feed URI scheme">feed</a></li> <li><a href="/wiki/Finger_(protocol)" title="Finger (protocol)">finger</a></li> <li><a href="/wiki/Internet_Relay_Chat#URI_scheme" class="mw-redirect" title="Internet Relay Chat">irc / irc6 / ircs</a></li> <li><a href="/wiki/Lightweight_Directory_Access_Protocol#URI_scheme" title="Lightweight Directory Access Protocol">ldaps</a></li> <li><a href="/wiki/Magnet_URI_scheme" title="Magnet URI scheme">magnet</a></li> <li><a href="/wiki/Rsync" title="Rsync">rsync</a></li> <li><a href="/wiki/Yahoo!_Messenger#URI_scheme" class="mw-redirect" title="Yahoo! Messenger">ymsgr</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><a href="/wiki/List_of_network_protocols_(OSI_model)" title="List of network protocols (OSI model)">Protocol list</a></div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Geo_URI_scheme&oldid=1258059988">https://en.wikipedia.org/w/index.php?title=Geo_URI_scheme&oldid=1258059988</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Internet_protocols" title="Category:Internet protocols">Internet protocols</a></li><li><a href="/wiki/Category:Geocodes" title="Category:Geocodes">Geocodes</a></li><li><a href="/wiki/Category:Geographic_information_systems" title="Category:Geographic information systems">Geographic information systems</a></li><li><a href="/wiki/Category:URI_schemes" title="Category:URI schemes">URI schemes</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li><li><a href="/wiki/Category:Wikipedia_articles_that_are_too_technical_from_May_2019" title="Category:Wikipedia articles that are too technical from May 2019">Wikipedia articles that are too technical from May 2019</a></li><li><a href="/wiki/Category:All_articles_that_are_too_technical" title="Category:All articles that are too technical">All articles that are too technical</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 17 November 2024, at 23:20<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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