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<title>GeographicLib: Geographic library</title>
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<h1>Geographic library </h1> </div>
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<dl class="author"><dt><b>Author:</b></dt><dd><a href="http://charles.karney.info/">Charles Karney</a> <<a href="mailto:charles@karney.com">charles@karney.com</a>> </dd></dl>
<dl class="version"><dt><b>Version:</b></dt><dd>1.8 </dd></dl>
<dl class="date"><dt><b>Date:</b></dt><dd>2011-02-22</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 geoid height calculations, and for solving geodesic problems. The emphasis is on returning accurate results with errors close to round-off (about 5–15 nm). In addition, various properties of the <a class="el" href="transversemercator.html">Transverse Mercator Projection</a> are described and an accurate algorithm for <a class="el" href="geodesic.html">Geodesics on the Ellipsoid</a> is given.</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://sf.net/projects/geographiclib">http://sf.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-1.8.tar.gz/download">geographiclib-1.8.tar.gz</a></li>
<li><a href="http://sf.net/projects/geographiclib/files/distrib/geographiclib-1.8.zip/download">geographiclib-1.8.zip</a></li>
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<p>as either a compressed tar file (tar.gz) or a zip file. (The two archives have identical contents.)</p>
<p>It is licensed under the <a href="http://www.gnu.org/licenses/lgpl-3.0-standalone.html">LGPL</a>. 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="start.html">Getting Started</a></li>
<li><a class="el" href="organization.html">Code organization</a></li>
<li><a class="el" href="transversemercator.html">Transverse Mercator Projection</a><ul>
<li><a class="el" href="transversemercator.html#testmerc">Test data for the transverse Mercator projection</a></li>
<li><a class="el" href="transversemercator.html#tmseries">Series approximation for transverse Mercator</a></li>
</ul>
</li>
<li><a class="el" href="geodesic.html">Geodesics on the Ellipsoid</a><ul>
<li><a class="el" href="geodesic.html#testgeod">Test data for geodesics</a></li>
<li><a class="el" href="geodesic.html#geodseries">Expansions for geodesics</a></li>
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</li>
<li><a class="el" href="geocentric.html">Geocentric coordinates</a></li>
<li><a class="el" href="geoid.html">Geoid height</a><ul>
<li><a class="el" href="geoid.html#geoidinst">Installing the datasets</a></li>
<li><a class="el" href="geoid.html#geoidformat">The format of the geoid data files</a></li>
<li><a class="el" href="geoid.html#geoidinterp">Interpolating the geoid data</a></li>
<li><a class="el" href="geoid.html#geoidcache">Caching the geoid data</a></li>
<li><a class="el" href="geoid.html#testgeoid">Test data for geoids</a></li>
</ul>
</li>
<li><a class="el" href="utilities.html">Utility Programs</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>
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