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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>
GeographicLib
</title>
<meta name="description" content="GeographicLib" />
<meta name="keywords"
content="geographic projections,
transverse Mercator,
polar stereographic,
azimuthal equidistant,
Cassini-Soldner,
UTM, UPS, MGRS,
geocentric coordinates,
geodetic coordinates,
local Cartesian coordinates,
geodesics, shortest path,
direct geodesic problem,
inverse geodesic problem,
rhumb line, loxodrome,
geoid, EGM84, EGM96, EGM2008,
earth gravity model,
gravity disturbance,
gravity anomaly,
deflection of the vertical,
geomagnetism, WMM2010, EMM2010, IGRF11,
WGS84 ellipsoid,
latitude and longitude,
degrees minutes and seconds,
C++ library" />
<meta name="author" content="Charles F. F. Karney" />
<link rel="stylesheet" type="text/css" href="default.css">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body topmargin=10 leftmargin=10>
<h3>GeographicLib</h3>
<p>
GeographicLib is a small set of C++ classes 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 library may be used from .NET
applications using the NETGeographicLib wrapper library.) It is a
suitable replacement for the core functionality provided by
<a href="http://earth-info.nga.mil/GandG/geotrans/">geotrans</a>.
The library is licensed under the
<a href="https://opensource.org/licenses/MIT">MIT/X11 License</a>;
see <a href="html/LICENSE.txt">LICENSE.txt</a> for the terms.
</p>
<ul>
<li>
<a href="https://sourceforge.net/projects/geographiclib/">
Main project page</a>
<li>
<a href="html">Library documentation</a>
<li>
<a href="https://sourceforge.net/p/geographiclib/code/ci/release/tree/">
git repository</a>
<li>
<a href="https://sourceforge.net/projects/geographiclib/files/distrib">
Download</a>
<li>
Implementations in <a href="html/other.html">other languages</a>:
<ul>
<li>
C (geodesic routines):
<a href="html/C/">
documentation</a>, also included with recent versions of
<a href="http://proj4.org">
proj.4</a> and the
<a href="https://cran.r-project.org/package=geosphere">
R package, geosphere</a>;
<li>
Fortran (geodesic routines):
<a href="html/Fortran/">
documentation</a>;
<li>
Java (geodesic routines):
<a href="https://repo1.maven.org/maven2/net/sf/geographiclib/GeographicLib-Java/">
Maven Central package</a>,
<a href="html/java/">
documentation</a>;
<li>
JavaScript (geodesic routines):
<a href="https://www.npmjs.com/package/geographiclib">
npm package</a>,
<a href="html/js/">
documentation</a>;
<li>
Python (geodesic routines):
<a href="https://pypi.python.org/pypi/geographiclib">
PyPI package</a>,
<a href="html/python/">
documentation</a>;
<li>
Matlab/Octave (geodesic and some other routines):
<a href="https://www.mathworks.com/matlabcentral/fileexchange/50605">
Matlab Central package</a>,
<a href="https://www.mathworks.com/matlabcentral/fileexchange/50605/content/Contents.m">
documentation</a>;
<li>
C# (.NET wrapper for complete C++ library):
<a href="html/NET/">
documentation</a>;
<li>IDL (not part of GeographicLib):
<a href="https://seanelvidge.com/2013/04/newtons-method-for-solving-the-inverse-geodesic-problem-in-idl/">
solving the inverse geodesic problem in IDL</a> by Sean
Elvidge and Chris Mannix;
<li>C# (not part of GeographicLib):
<a href="https://github.com/suryapratap/GeographicLib">
GeographicLib (C#)</a> by Surya Pratap (the same capability
is provided by the <a href="html/NET/">NETGeographicLib</a>);
<li>Mathematica (not part of GeographicLib):
<a href="https://github.com/330k/mathematica-geodesic/">
mathematica-geodesic</a> by Kei Misawa.
</ul>
<li><a href="https://sourceforge.net/projects/geographiclib/files/testdata">
Test data</a> for
<ul>
<li>the <a href="https://doi.org/10.5281/zenodo.32156">
geodesic problem</a>
<li>the <a href="https://doi.org/10.5281/zenodo.32470">
transverse Mercator projection</a>
<li><a href="html/geoid.html#testgeoid">
geoid heights</a>
</ul>
<li><a href="https://sourceforge.net/projects/geographiclib/files/geoids-distrib">
Gridded geoid data</a>; see
<a href="html/geoid.html#geoidinst">here</a> for
documentation
<li><a href="https://sourceforge.net/projects/geographiclib/files/gravity-distrib">
Earth gravity models</a>; see
<a href="html/gravity.html#gravityinst">here</a> for
documentation
<li><a href="https://sourceforge.net/projects/geographiclib/files/magnetic-distrib">
Geomagnetic models</a>; see
<a href="html/magnetic.html#magneticinst">here</a> for
documentation
<li>
Online calculations using GeographicLib
<a href="html/utilities.html">utilities</a>
<ul>
<li>
<a href="cgi-bin/GeoConvert">
geographic coordinate conversions</a> between
latitude/longitude, UTM or UPS, and MGRS
<li>
<a href="cgi-bin/GeodSolve">
direct and inverse geodesic calculations</a>
<li>
<a href="cgi-bin/Planimeter">
calculate the perimeter and area of geodesic polygons</a>
<li>
<a href="scripts/geod-calc.html">
various geodesic calculations using JavaScript</a>
<li>
<a href="scripts/geod-google.html">
a tool for displaying geodesics on Google Maps</a>
<li>
<a href="http://www.javawa.nl/coordcalc_en.html">
a graphical tool by [email protected] for geodesic calculations</a>
<li>
<a href="cgi-bin/RhumbSolve">
rhumb line calculator</a>
<li>
<a href="cgi-bin/GeoidEval">
evaluate the geoid height</a> for
EGM84, EGM96, and EGM2008
</ul>
<li>
<a href="geodesic-papers/biblio.html">
A geodesic bibliography</a>.
This lists many papers treating geodesics on an ellipsoid and
includes links to online versions of the papers.
<li>
<a href="tm.html">Resource page</a> for
<ul>
<li>
C. F. F. Karney,
<a href="https://doi.org/10.1007/s00190-011-0445-3">
<i>Transverse Mercator with an accuracy of a few
nanometers</i></a>,
J. Geodesy <b>85</b>(8), 475–485 (Aug. 2011); preprint
<a href="https://arxiv.org/abs/1002.1417">
arXiv:1002.1417</a>;
<a href="tm-addenda.html">addenda</a>.
</ul>
<li>
<a href="geod.html">Resource page</a> for
<ul>
<li>
C. F. F. Karney,
<i>Geodesics on an ellipsoid of revolution</i>,
<a href="https://arxiv.org/abs/1102.1215"> arXiv:1102.1215</a>
(Feb. 2011).
<li>
C. F. F. Karney,
<a href="https://doi.org/10.1007/s00190-012-0578-z">
<i>Algorithms for geodesics</i></a>,
J. Geodesy <b>87</b>(1), 43–55 (Jan. 2013); DOI:
<a href="https://doi.org/10.1007/s00190-012-0578-z">
10.1007/s00190-012-0578-z</a>;
<a href="geod-addenda.html">addenda</a>.
</ul>
</ul>
<hr>
<address>Charles Karney
<a href="mailto:[email protected]"><[email protected]></a>
(2017-09-30)</address>
<br>
</body>
</html>