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<!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="content-type" content="text/html;charset=utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="./base.css"> <link rel="icon" type="image/x-icon" href="./favicon.ico"> <title>Home -- Spatial Reference</title> <meta name="keywords" content="epsg, esri, iau, ignf, nkg, ogc, coordinate system, srs, crs" > <meta name="description" content="Spatial Reference catalog of coordinate reference systems" > </head> <body> <div id="header"> <div id="header_logo"> <a href="./"><img src="./sr_logo.jpg" alt="SR logo"></a> </div> <div id="header_title"> Welcome </div> </div> <div id="searchbox"> <form action="./ref/"> <input type="text" name="search" value=""> <input type="submit" value="Search"> </form> </div> <div id="navbar"> <div id="navlinks"> <a href="./">Home</a> | <a href="./ref/">List all references</a> | <a href="./explorer.html">Explorer</a> </div> </div> <div id="content"> <h2>What is SpatialReference.org?</h2> SpatialReference.org is a comprehensive online resource dedicated to providing detailed information and reference materials on spatial coordinate reference systems.<br> This website is essential for geospatial professionals, GIS developers, and cartographers, providing an extensive database of spatial reference systems used globally.<br> The website allows users to search, access, and implement various spatial references easily, offering standardized formats like Well-Known Text (WKT) or PROJJSON. A wide array of coordinate reference systems, such as WGS 84 or NAD83(2011) geographic systems, thousands of projected systems (like UTM zones), as well as vertical systems like NAVD88 are supported.<br> One of the key features of SpatialReference.org is its support for EPSG codes. EPSG, which stands for European Petroleum Survey Group, is a widely recognized standard for defining coordinate reference systems. These codes simplify the identification and use of spatial reference systems in various geospatial applications. <h2>Find your references in any number of formats!</h2> This page shows a list of the Coordinate Reference Systems included in <a href="https://proj.org">PROJ</a>. <ul> <li>See Existing EPSG Codes: <a href="./ref/epsg/4326/">4326</a>, <a href="./ref/epsg/6492/">6492</a></li> <li>Browse a list: <ul> <li>7615 <a href="./ref/epsg/">EPSG</a> references</li> <li>2902 <a href="./ref/esri/">ESRI</a> references</li> <li>2201 <a href="./ref/iau_2015/">IAU:2015</a> references</li> <li>864 <a href="./ref/ignf/">IGNF</a> references</li> <li>2 <a href="./ref/nkg/">NKG</a> references</li> <li>4 <a href="./ref/ogc/">OGC</a> references</li> </ul> </li> </ul> <a href="./explorer.html" title="Open Explorer"> <p>Click the Map to open the Explorer</p> <img src="https://a.tile.openstreetmap.org/0/0/0.png"> </a> <p>Last revised in 2024</p> </div> <div id="footer"> <a href="./about.html">About</a> - Built on 2025-03-15 using <a href="https://proj.org">PROJ</a> 9.6.0 (See detailed <a href="./versions.html">versions here</a>) - Code implementation inspired by <a href="https://crs-explorer.proj.org">crs-explorer.proj.org</a> </div> <script src="./base.js"></script> </body>