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<title>GeographicLib: Introduction</title>
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<div id="projectname">GeographicLib
 <span id="projectnumber">1.21</span>
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<div class="title">Introduction </div> </div>
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<div class="textblock"><center> Forward to <a class="el" href="install.html">Installing GeographicLib</a>. Up to <a class="el" href="index.html#contents">Contents</a>. </center><p>GeographicLib offers a C++ interfaces to a small (but important!) set of geographic transformations. It grew out of a desire to improve on the <a href="http://earth-info.nima.mil/GandG/geotrans/">geotrans</a> package for transforming between geographic and MGRS coordinates. At present, GeographicLib provides UTM, UPS, MGRS, geocentric, and local cartesian projections, gravity and geomagnetic models, and classes for geodesic calculations.</p>
<p>The goals of GeographicLib are:</p>
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<li>Accuracy. In most applications the accuracy is close to round-off, about 5 nm (5 nanometers). Even though in many geographic applications 1 cm is considered "accurate enough", there is little penalty in providing much better accuracy. If situations where a faster approximate algorithm is necessary, GeographicLib offers an accurate benchmark to guide the development.</li>
<li>Completeness. For each of the projections included, an attempt is made to provide a complete solution. For example, <a class="el" href="classGeographicLib_1_1Geodesic.html#ad7e59a242125a35a95c96cdb20573081">GeographicLib::Geodesic::Inverse</a> works for anti-podal points. Similarly, <a class="el" href="classGeographicLib_1_1Geocentric.html#a1907735ce8f5f915a14a5f7a8b3adfea">GeographicLib::Geocentric.Reverse</a> will return accurate geodetic coordinates even for points close to the center of the earth.</li>
<li>C++ interface. For the projection methods, this allows encapsulation of the ellipsoid parameters.</li>
<li>Emphasis on projections necessary for analyzing military data.</li>
<li>Uniform treatment of UTM/UPS. The <a class="el" href="classGeographicLib_1_1UTMUPS.html" title="Convert between Geographic coordinates and UTM/UPS.">GeographicLib::UTMUPS</a> class treats UPS as zone 0. This simplifies conversions between UTM and UPS coordinates, etc.</li>
<li>Well defined and stable conventions for the conversion between UTM/UPS to MGRS coordinates.</li>
<li>Detailed internal documentation on the algorithms. For the most part GeographicLib uses published algorithms and references are given. If changes have been made (usually to improve the numerical accuracy), these are described in the code.</li>
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<p>Various <a class="el" href="utilities.html">Utility programs</a> are provided with the library. These illustrate the use of the library and are useful in their own right. This library and the utilities have been tested with g++ 4.4 under Linux, with g++ 4.2 under Mac OS X, and with MS Visual Studio 2008 and 2010.</p>
<p>Matlab, Javascript, and Python interfaces are provided to portions of GeographicLib; see <a class="el" href="other.html">Other interfaces (Javascript, Python, Matlab, Octave)</a>.</p>
<p>The section <a class="el" href="geodesic.html">Geodesics on the ellipsoid</a> documents the method of solving the geodesic problem.</p>
<p>The section <a class="el" href="transversemercator.html">Transverse Mercator projection</a> documents various properties of this projection.</p>
<p>Undoubtedly, bugs lurk in this code and in the documentation. Please report any you find to <<a href="mailto:charles@karney.com">charles@karney.com</a>>.</p>
<center> Forward to <a class="el" href="install.html">Installing GeographicLib</a>. Up to <a class="el" href="index.html#contents">Contents</a>. </center> </div></div>
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