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<title>GeographicLib: Geographic library</title>
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<div id="projectname">GeographicLib
 <span id="projectnumber">1.21</span>
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<li><a href="namespaces.html"><span>Namespaces</span></a></li>
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<div class="title">Geographic library </div> </div>
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<div class="textblock"><dl class="author"><dt><b>Author:</b></dt><dd>Charles Karney <<a href="mailto:charles@karney.com">charles@karney.com</a>> </dd></dl>
<dl class="version"><dt><b>Version:</b></dt><dd>1.21 </dd></dl>
<dl class="date"><dt><b>Date:</b></dt><dd>2012-04-25</dd></dl>
<h2><a class="anchor" id="abstract"></a>
Abstract</h2>
<p>GeographicLib is a small set of <a href="annotated.html">C++ classes</a> for performing conversions between geographic, UTM, UPS, MGRS, geocentric, and local cartesian coordinates, for gravity (e.g., EGM2008), geoid height and geomagnetic field (e.g., WMM2010) calculations, and for solving geodesic problems. The emphasis is on returning accurate results with errors close to round-off (about 5–15 nanometers). New accurate algorithms for <a class="el" href="geodesic.html">Geodesics on the ellipsoid</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">Other interfaces (Javascript, Python, Matlab, Octave)</a>. 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; use <a href="http://trac.osgeo.org/proj/">proj.4</a> for that. On the other hand, it does provide the core functionality offered by <a href="http://earth-info.nima.mil/GandG/geotrans/">geotrans</a> and it cures several of the defects of that package.</p>
<h2><a class="anchor" id="download"></a>
Download</h2>
<p>The main project page is at</p>
<ul>
<li><a href="http://sourceforge.net/projects/geographiclib">http://sourceforge.net/projects/geographiclib </a></li>
</ul>
<p>The code is available for download at</p>
<ul>
<li><a href="http://sf.net/projects/geographiclib/files/distrib/GeographicLib-1.21.tar.gz/download">GeographicLib-1.21.tar.gz</a></li>
<li><a href="http://sf.net/projects/geographiclib/files/distrib/GeographicLib-1.21.zip/download">GeographicLib-1.21.zip</a></li>
</ul>
<p>as either a compressed tar file (tar.gz) or a zip file. (The two archives have identical contents.) Alternatively you can get the latest stable release using git </p>
<div class="fragment"><pre class="fragment">
git clone git://geographiclib.git.sf.net/gitroot/geographiclib/geographiclib-release geographiclib
cd geographiclib; git checkout stable
</pre></div><p> There are also a binary installers for Windows available at</p>
<ul>
<li><a href="http://sf.net/projects/geographiclib/files/distrib/GeographicLib-1.21-win32.exe/download">GeographicLib-1.21-win32.exe</a></li>
<li><a href="http://sf.net/projects/geographiclib/files/distrib/GeographicLib-1.21-win64.exe/download">GeographicLib-1.21-win64.exe</a></li>
</ul>
<p>It is licensed under the <a href="http://www.opensource.org/licenses/MIT">MIT/X11 License</a>; see <a href="LICENSE.txt">LICENSE.txt</a> for the terms. For more information, see <a href="http://geographiclib.sourceforge.net/.">http://geographiclib.sourceforge.net/.</a></p>
<h2><a class="anchor" id="contents"></a>
Contents</h2>
<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">Other interfaces (Javascript, Python, Matlab, Octave)</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="magnetic.html">Magnetic models</a></li>
<li><a class="el" href="geodesic.html">Geodesics on the ellipsoid</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="old.html">Old versions</a></li>
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<center> Forward to <a class="el" href="intro.html">Introduction</a>. </center> </div></div>
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