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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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   <div id="projectname">GeographicLib
   &#160;<span id="projectnumber">1.49</span>
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<div class="title"><a class="el" href="namespaceGeographicLib.html" title="Namespace for GeographicLib. ">GeographicLib</a> library </div>  </div>
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<div class="textblock"><dl class="section author"><dt>Author</dt><dd>Charles F. F. Karney (<a href="#" onclick="location.href='mai'+'lto:'+'cha'+'rl'+'es@'+'ka'+'rne'+'y.'+'com'; return false;">charl<span style="display: none;">.nosp@m.</span>es@k<span style="display: none;">.nosp@m.</span>arney<span style="display: none;">.nosp@m.</span>.com</a>) </dd></dl>
<dl class="section version"><dt>Version</dt><dd>1.49 </dd></dl>
<dl class="section date"><dt>Date</dt><dd>2017-10-05</dd></dl>
<p>The documentation for other versions is available at <code><a href="https://geographiclib.sourceforge.io/m.nn/">https://geographiclib.sourceforge.io/m.nn/</a></code> for versions numbers <code>m.nn</code> &ge; 1.0.</p>
<h1><a class="anchor" id="abstract"></a>
Abstract</h1>
<p><a class="el" href="namespaceGeographicLib.html" title="Namespace for GeographicLib. ">GeographicLib</a> is a small set of <a href="annotated.html">C++ classes</a> for performing conversions between geographic, UTM, UPS, <a class="el" href="classGeographicLib_1_1MGRS.html" title="Convert between UTM/UPS and MGRS. ">MGRS</a>, geocentric, and local cartesian coordinates, for gravity (e.g., EGM2008), geoid height and geomagnetic field (e.g., WMM2015) calculations, and for solving geodesic problems. The emphasis is on returning accurate results with errors close to round-off (about 5&ndash;15 nanometers). Accurate algorithms for <a class="el" href="geodesic.html">Geodesics on an ellipsoid of revolution</a> and <a class="el" href="transversemercator.html">Transverse Mercator projection</a> have been developed for this library. The functionality of the library can be accessed from user code, from the <a class="el" href="utilities.html">Utility programs</a> provided, or via the <a class="el" href="other.html">Implementations in other languages</a>. Also included is a .NET wrapper library <a href="NET/index.html">NETGeographicLib</a> which exposes the functionality to .NET applications. For a sample of the geodesic capabilities in JavaScript, check out the <a href="../scripts/geod-calc.html">online geodesic calculator</a> and the script for displaying <a href="../scripts/geod-google.html">geodesics in Google Maps</a></p>
<p>This library is <em>not</em> a general purpose projection library nor does it perform datum conversions; instead use <a href="http://proj.org">proj.4</a>. On the other hand, it does provide the core functionality offered by <a href="http://earth-info.nga.mil/GandG/geotrans/">GEOTRANS</a>.</p>
<h1><a class="anchor" id="download"></a>
Download</h1>
<p>The main project page is at</p><ul>
<li><a href="https://sourceforge.net/projects/geographiclib">https://sourceforge.net/projects/geographiclib</a></li>
</ul>
<p>The code is available for download at</p><ul>
<li><a href="https://sourceforge.net/projects/geographiclib/files/distrib/GeographicLib-1.49.tar.gz">GeographicLib-1.49.tar.gz</a></li>
<li><a href="https://sourceforge.net/projects/geographiclib/files/distrib/GeographicLib-1.49.zip">GeographicLib-1.49.zip</a></li>
</ul>
<p>as either a compressed tar file (tar.gz) or a zip file. (The two archives have identical contents, except that the zip file has DOS line endings.) Alternatively you can get the latest release using git </p><pre class="fragment">  git clone git://git.code.sourceforge.net/p/geographiclib/code geographiclib
</pre><p> Each release is tagged, e.g., with r1.49. There are also binary installers available for some platforms. See <a class="el" href="install.html#binaryinst">Using a binary installer</a>.</p>
<p><a class="el" href="namespaceGeographicLib.html" title="Namespace for GeographicLib. ">GeographicLib</a> is licensed under the <a href="https://opensource.org/licenses/MIT">MIT/X11 License</a>; see <a href="LICENSE.txt">LICENSE.txt</a> for the terms.</p>
<p>For more information on <a class="el" href="namespaceGeographicLib.html" title="Namespace for GeographicLib. ">GeographicLib</a>, see</p><ul>
<li><a href="https://geographiclib.sourceforge.io/">https://geographiclib.sourceforge.io/</a>.</li>
</ul>
<h1><a class="anchor" id="citint"></a>
Citing GeographicLib</h1>
<p>When citing <a class="el" href="namespaceGeographicLib.html" title="Namespace for GeographicLib. ">GeographicLib</a>, use (adjust the version number and date as appropriate)</p><ul>
<li>C. F. F. Karney, <a class="el" href="namespaceGeographicLib.html" title="Namespace for GeographicLib. ">GeographicLib</a>, Version 1.49 (2017-mm-dd), <a href="https://geographiclib.sourceforge.io/1.49">https://geographiclib.sourceforge.io/1.49</a></li>
</ul>
<h1><a class="anchor" id="contents"></a>
Contents</h1>
<ul>
<li><a class="el" href="intro.html">Introduction</a></li>
<li><a class="el" href="install.html">Installing GeographicLib</a></li>
<li><a class="el" href="start.html">Getting started</a></li>
<li><a class="el" href="utilities.html">Utility programs</a></li>
<li><a class="el" href="organization.html">Code organization</a></li>
<li><a class="el" href="other.html">Implementations in other languages</a></li>
<li><a class="el" href="geoid.html">Geoid height</a></li>
<li><a class="el" href="gravity.html">Gravity models</a></li>
<li><a class="el" href="normalgravity.html">Normal gravity</a></li>
<li><a class="el" href="magnetic.html">Magnetic models</a></li>
<li><a class="el" href="geodesic.html">Geodesics on an ellipsoid of revolution</a></li>
<li><a class="el" href="nearest.html">Finding nearest neighbors</a></li>
<li><a class="el" href="triaxial.html">Geodesics on a triaxial ellipsoid</a></li>
<li><a class="el" href="jacobi.html">Jacobi's conformal projection</a></li>
<li><a class="el" href="rhumb.html">Rhumb lines</a></li>
<li><a class="el" href="greatellipse.html">Great Ellipses</a></li>
<li><a class="el" href="transversemercator.html">Transverse Mercator projection</a></li>
<li><a class="el" href="geocentric.html">Geocentric coordinates</a></li>
<li><a class="el" href="auxlat.html">Auxiliary latitudes</a></li>
<li><a class="el" href="highprec.html">Support for high precision arithmetic</a></li>
<li><a class="el" href="changes.html">Change log</a></li>
</ul>
<center> Forward to <a class="el" href="intro.html">Introduction</a>. </center> </div></div><!-- contents -->
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