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<div class="textblock"><center> Back to <a class="el" href="geocentric.html">Geocentric coordinates</a>. Up to <a class="el" href="index.html#contents">Contents</a>. </center><p>List of versions in reverse chronological order together with a brief list of changes. (Note: Old versions of the library use a year-month style of numbering. Now, the library uses a major and minor version number.) Recent versions of GeographicLib are available at <a href="http://sf.net/projects/geographiclib/files/distrib/">http://sourceforge.net/projects/geographiclib/files/distrib/</a>. Older versions are in <a href="http://sf.net/projects/geographiclib/files/distrib/archive/">http://sourceforge.net/projects/geographiclib/files/distrib/archive/</a>.</p>
<ul>
<li>Version 1.21 (released 2012-04-25)<ul>
<li>Support colon-separated DMS output:<ul>
<li><a class="el" href="classGeographicLib_1_1DMS.html#a0777e26ef4507f8123549723bf3cb56f">GeographicLib::DMS::Encode</a> and <a class="el" href="classGeographicLib_1_1GeoCoords.html#af6e9f9087a407b01dc24401df8610257">GeographicLib::GeoCoords::DMSRepresentation</a> generalized;</li>
<li><a href="GeoConvert.1.html">GeoConvert</a> and <a href="Geod.1.html">Geod</a> now accept a -: option.</li>
</ul>
</li>
<li><a href="GeoidEval.1.html">GeoidEval</a> does not print the gradient of the geoid height by default (because it's subject to large errors); give the -g option to get the gradient printed.</li>
<li>Work around optimization BUG in <a class="el" href="classGeographicLib_1_1Geodesic.html#ad7e59a242125a35a95c96cdb20573081">GeographicLib::Geodesic::Inverse</a> with tdm mingw g++ version 4.6.1.</li>
<li>autoconf fixed to ensure that that out-of-sources builds work; document this as the preferred method of using autoconf.</li>
<li>cmake tweaks:<ul>
<li>simplify the configuration of doxygen;</li>
<li>allow the Matlab compiler to be specified with the MATLAB_COMPILER option.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.20 (released 2012-03-23)<ul>
<li>cmake tweaks:<ul>
<li>improve find_package's matching of compiler versions;</li>
<li>CMAKE_INSTALL_PREFIX set from CMAKE_PREFIX_PATH if available;</li>
<li>add "x64" to the package name for the 64-bit binary installer;</li>
<li>fix cmake warning with Visual Studio Express.</li>
</ul>
</li>
<li>Fix <a class="el" href="classGeographicLib_1_1SphericalEngine.html" title="The evaluation engine for SphericalHarmonic.">GeographicLib::SphericalEngine</a> to deal with aggessive iterator checking by Visual Studio.</li>
<li>Fix transcription BUG is Geodesic.js.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.19 (released 2012-03-13)<ul>
<li>Slight improvement in <a class="el" href="classGeographicLib_1_1Geodesic.html#ad7e59a242125a35a95c96cdb20573081">GeographicLib::Geodesic::Inverse</a> for very short lines.</li>
<li>Fix argument checking tests in <a class="el" href="classGeographicLib_1_1MGRS.html#a91de10ebde478dbb85b3c7d057ff97b9">GeographicLib::MGRS::Forward</a>.</li>
<li>Add --comment-delimiter and --line-separator options to the <a class="el" href="utilities.html">Utility programs</a>.</li>
<li>Add installer for 64-bit Windows; the compiled Matlab interface is supplied with the Windows 64-bit installer only.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.18 (released 2012-02-18)<ul>
<li>Improve documentation on configuration with cmake.</li>
<li>cmake's find_package ensures that the compiler versions match on Windows.</li>
<li>Improve documentation on compiling Matlab interface.</li>
<li>Binary installer for Windows installs under C:/pkg-vc10 by default.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.17 (released 2012-01-21)<ul>
<li>Work around optimization BUG in <a class="el" href="classGeographicLib_1_1Geodesic.html#ad7e59a242125a35a95c96cdb20573081">GeographicLib::Geodesic::Inverse</a> with g++ version 4.4.0 (mingw).</li>
<li>Fix BUG in argument checking with <a class="el" href="classGeographicLib_1_1OSGB.html#a0a79e8f2babae1eb0305a0e728fea8c8">GeographicLib::OSGB::GridReference</a>.</li>
<li>Fix missing include file in <a class="el" href="classGeographicLib_1_1SphericalHarmonic2.html" title="Spherical Harmonic series with two corrections to the coefficients.">GeographicLib::SphericalHarmonic2</a>.</li>
<li>Add simple examples of usage for each class.</li>
<li>Add internal documentation to the cmake configuration files.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.16 (released 2011-12-07)<ul>
<li>Add calculation of the earth's gravitational field:<ul>
<li>add <a class="el" href="classGeographicLib_1_1NormalGravity.html" title="The normal gravity of the earth.">GeographicLib::NormalGravity</a> <a class="el" href="classGeographicLib_1_1GravityModel.html" title="Model of the earth's gravity field.">GeographicLib::GravityModel</a> and <a class="el" href="classGeographicLib_1_1GravityCircle.html" title="Gravity on a circle of latitude.">GeographicLib::GravityCircle</a> classes;</li>
<li>add command line utility <a href="Gravity.1.html">Gravity</a>;</li>
<li>add <a class="el" href="gravity.html">Gravity models</a>;</li>
<li>add <a class="el" href="classGeographicLib_1_1Constants.html#af7806106d7bd289bb63d5290e79c87a6">GeographicLib::Constants::WGS84_GM()</a>, <a class="el" href="classGeographicLib_1_1Constants.html#a98c114d5a6ca42d3e4ece8595a0c2180">GeographicLib::Constants::WGS84_omega()</a>, and similarly for GRS80.</li>
</ul>
</li>
<li>Build uses GEOGRAPHICLIB_DATA to specify a common parent directory for geoid, gravity, and magnetic data (instead of GEOGRAPHICLIB_GEOID_PATH, etc.); similarly, <a href="GeoidEval.1.html">GeoidEval</a>, <a href="Gravity.1.html">Gravity</a>, and <a href="MagneticField.1.html">MagneticField</a>, look at the environment variable GEOGRAPHICLIB_DATA to locate the data.</li>
<li>Spherical harmonic software changes:<ul>
<li>capitalize enums <a class="el" href="classGeographicLib_1_1SphericalHarmonic.html#a889791c67edc32865996842c600104ebaee7040963f955b45b5a8ab0ea325c782">GeographicLib::SphericalHarmonic::FULL</a> and <a class="el" href="classGeographicLib_1_1SphericalHarmonic.html#a889791c67edc32865996842c600104eba014c2f3300abd50ff65ea8d73ef3c69e">GeographicLib::SphericalHarmonic::SCHMIDT</a> (the lower case names are retained but deprecated);</li>
<li>optimize the sum by using a static table of square roots which is updated by <a class="el" href="classGeographicLib_1_1SphericalEngine.html#a7fac63262c0a8bb18aee8c962a08d429">GeographicLib::SphericalEngine::RootTable</a>;</li>
<li>avoid overflow for high degree models.</li>
</ul>
</li>
<li>Magnetic software fixes:<ul>
<li>fix documentation BUG in <a class="el" href="classGeographicLib_1_1MagneticModel.html#ae4275d73128fc2c6c62f53677ce70bd5">GeographicLib::MagneticModel::Circle</a>;</li>
<li>make <a class="el" href="classGeographicLib_1_1MagneticModel.html" title="Model of the earth's magnetic field.">GeographicLib::MagneticModel</a> constructor explicit;</li>
<li>provide default <a class="el" href="classGeographicLib_1_1MagneticCircle.html" title="Geomagnetic field on a circle of latitude.">GeographicLib::MagneticCircle</a> constructor;</li>
<li>add additional inspector functions to <a class="el" href="classGeographicLib_1_1MagneticCircle.html" title="Geomagnetic field on a circle of latitude.">GeographicLib::MagneticCircle</a>;</li>
<li>add -c option to <a href="MagneticField.1.html">MagneticField</a>;</li>
<li>default height to zero in <a href="MagneticField.1.html">MagneticField</a>.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.15 (released 2011-11-08)<ul>
<li>Add calculation of the earth's magnetic field:<ul>
<li>add <a class="el" href="classGeographicLib_1_1MagneticModel.html" title="Model of the earth's magnetic field.">GeographicLib::MagneticModel</a> and <a class="el" href="classGeographicLib_1_1MagneticCircle.html" title="Geomagnetic field on a circle of latitude.">GeographicLib::MagneticCircle</a> classes;</li>
<li>add command line utility <a href="MagneticField.1.html">MagneticField</a>;</li>
<li>add <a class="el" href="magnetic.html">Magnetic models</a>;</li>
<li>add <a class="el" href="magnetic.html#magneticinst">Installing the magnetic field models</a>;</li>
<li>add <a class="el" href="magnetic.html#magneticformat">The format of the magnetic model files</a>;</li>
<li>add classes <a class="el" href="classGeographicLib_1_1SphericalEngine.html" title="The evaluation engine for SphericalHarmonic.">GeographicLib::SphericalEngine</a>, <a class="el" href="classGeographicLib_1_1CircularEngine.html" title="Spherical Harmonic sums for a circle.">GeographicLib::CircularEngine</a>, <a class="el" href="classGeographicLib_1_1SphericalHarmonic.html" title="Spherical Harmonic series.">GeographicLib::SphericalHarmonic</a>, <a class="el" href="classGeographicLib_1_1SphericalHarmonic1.html" title="Spherical Harmonic series with a correction to the coefficients.">GeographicLib::SphericalHarmonic1</a>, and <a class="el" href="classGeographicLib_1_1SphericalHarmonic2.html" title="Spherical Harmonic series with two corrections to the coefficients.">GeographicLib::SphericalHarmonic2</a>. which sum spherical harmonic series.</li>
</ul>
</li>
<li>Add <a class="el" href="classGeographicLib_1_1Utility.html" title="Some utility routines for GeographicLib.">GeographicLib::Utility</a> class to support I/O and date manipulation.</li>
<li>Cmake configuration includes a _d suffix on the library built in debug mode.</li>
<li>For the Python package, include manifest and readme files; don't install setup.py for non-Windows systems.</li>
<li>Include Doxygen tag file in distribution as doc/html/Geographic.tag.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.14 (released 2011-09-30)<ul>
<li>Ensure that geographiclib-config.cmake is relocatable.</li>
<li>Allow more unicode symbols to be used in <a class="el" href="classGeographicLib_1_1DMS.html#ae802c666ad53884ce062281409bd78b4">GeographicLib::DMS::Decode</a>.</li>
<li>Modify <a href="GeoidEval.1.html">GeoidEval</a> so that it can be used to convert the height datum for LIDAR data.</li>
<li>Modest speed-up of Geodesic::Inverse.</li>
<li>Changes in python interface:<ul>
<li>FIX BUG in transcription of Geodesic::Inverse;</li>
<li>include setup.py for easy installation;</li>
<li>python only distribution is available at <a href="http://pypi.python.org/pypi/geographiclib">http://pypi.python.org/pypi/geographiclib</a></li>
</ul>
</li>
<li>Supply a minimal Qt qmake project file for library src/Geographic.pro.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.13 (released 2011-08-13)<ul>
<li>Changes to I/O:<ul>
<li>allow : (colon) to be used as a DMS separator in <a class="el" href="classGeographicLib_1_1DMS.html#ae802c666ad53884ce062281409bd78b4">GeographicLib::DMS::Decode(const std::string&, flag&)</a>;</li>
<li>also accept Unicode symbols for degrees, minutes, and seconds (coded as UTF-8);</li>
<li>provide optional <em>swaplatlong</em> argument to various <a class="el" href="classGeographicLib_1_1DMS.html" title="Convert between degrees and DMS representation.">GeographicLib::DMS</a> and <a class="el" href="classGeographicLib_1_1GeoCoords.html" title="Conversion between geographic coordinates.">GeographicLib::GeoCoords</a> functions to make longitude precede latitude;</li>
<li><a href="GeoConvert.1.html">GeoConvert</a> now has a -w option to make longitude precede latitude on input and output;</li>
<li>include a Javascript version of <a class="el" href="classGeographicLib_1_1DMS.html" title="Convert between degrees and DMS representation.">GeographicLib::DMS</a>.</li>
</ul>
</li>
<li>Slight improvement in starting guess for solution of geographic latitude in terms of conformal latitude in TransverseMercator, TransverseMercatorExact, and LambertConformalConic.</li>
<li>For most classes, get rid of const member variables so that the default copy assignment works.</li>
<li>Put <a class="el" href="classGeographicLib_1_1Math.html" title="Mathematical functions needed by GeographicLib.">GeographicLib::Math</a> and <a class="el" href="classGeographicLib_1_1Accumulator.html" title="An accumulator for sums.">GeographicLib::Accumulator</a> in their own header files.</li>
<li>Remove unused "fast" <a class="el" href="classGeographicLib_1_1Accumulator.html" title="An accumulator for sums.">GeographicLib::Accumulator</a> method.</li>
<li>Reorganize the <a class="el" href="other.html#python">Python interface</a>.</li>
<li>Withdraw some deprecated routines.</li>
<li>cmake changes:<ul>
<li>include FindGeographic.cmake in distribution;</li>
<li>building with cmake creates and installs geographiclib-config.cmake;</li>
<li>better support for building a shared library under Windows.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.12 (released 2011-07-21)<ul>
<li>Change license to MIT/X11.</li>
<li>Add <a class="el" href="classGeographicLib_1_1PolygonArea.html" title="Polygon Areas.">GeographicLib::PolygonArea</a> class and equivalent Matlab function.</li>
<li>Provide Javascript and Python implementations of geodesic routines.</li>
<li>Fix Windows installer to include runtime dlls for Matlab.</li>
<li>Fix (innocuous) unassigned variable in Geodesic::GenInverse.</li>
<li>Geodesic routines in Matlab return a12 as first column of aux return value (incompatible change).</li>
<li>A couple of code changes to enable compilation with Visual Studio 2003.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.11 (released 2011-06-27)<ul>
<li>Changes to <a href="Planimeter.1.html">Planimeter</a>:<ul>
<li>add -l flag to <a href="Planimeter.1.html">Planimeter</a> for polyline calculations;</li>
<li>trim precision of area to 3 decimal places;</li>
<li>FIX BUG with pole crossing edges (due to compiler optimization).</li>
</ul>
</li>
<li><a href="Geod.1.html">Geod</a> no longer reports the reduced length by default; however the -f flag still reports this and in addition gives the geodesic scales and the geodesic area.</li>
<li>FIX BUGS (compiler-specific) in inverse geodesic calculations.</li>
<li>FIX BUG: accommodate tellg() returning -1 at end of string.</li>
<li>Change way flattening of the ellipsoid is specified:<ul>
<li>constructors take <em>f</em> argument which is taken to be the flattening if <em>f</em> < 1 and the inverse flattening otherwise (this is a compatible change for spheres and oblate ellipsoids, but it is an INCOMPATIBLE change for prolate ellipsoids);</li>
<li>the -e arguments to the <a class="el" href="utilities.html">Utility programs</a> are handled similarly; in addition, simple fractions, e.g., 1/297, can be used for the flattening;</li>
<li>introduce <a class="el" href="classGeographicLib_1_1Constants.html#acc5244425bb484594be51b27d56cd335">GeographicLib::Constants::WGS84_f()</a> for the WGS84 flattening (and deprecate Constants::WGS84_r() for the inverse flattening);</li>
<li>most classes have a Flattening() member function;</li>
<li>InverseFlattening() has been deprecated (and now returns inf for a sphere, instead of 0).</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.10 (released 2011-06-11)<ul>
<li>Improvements to Matlab/Octave interface:<ul>
<li>add {geocentric,localcartesian}{forward,reverse};</li>
<li>make geographiclibinterface more general;</li>
<li>install the source for the interface;</li>
<li>cmake compiles the interface if ENABLE_MATLAB=ON;</li>
<li>include compiled interface with Windows binary installer.</li>
</ul>
</li>
<li>Fix various configuration issues<ul>
<li>autoconf did not install Config.h;</li>
<li>cmake installed in man/man1 instead of share/man/man1;</li>
<li>cmake did not set the rpath on the tools.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.9 (released 2011-05-28)<ul>
<li>FIX BUG in area returned by <a href="Planimeter.1.html">Planimeter</a> for pole encircling polygons.</li>
<li>FIX BUG in error message reported when DMS::Decode reads the string "5d.".</li>
<li>FIX BUG in AlbersEqualArea::Reverse (lon0 not being used).</li>
<li>Ensure that all exceptions thrown in the <a class="el" href="utilities.html">Utility programs</a> are caught.</li>
<li>Avoid using catch within <a class="el" href="classGeographicLib_1_1DMS.html" title="Convert between degrees and DMS representation.">GeographicLib::DMS</a>.</li>
<li>Move <a class="el" href="classGeographicLib_1_1Accumulator.html" title="An accumulator for sums.">GeographicLib::Accumulator</a> class from <a class="el" href="Planimeter_8cpp.html" title="Command line utility for measuring the area of geodesic polygons.">Planimeter.cpp</a> to <a class="el" href="Constants_8hpp.html" title="Header for GeographicLib::Constants class.">Constants.hpp</a>.</li>
<li>Add <a class="el" href="classGeographicLib_1_1Math.html#a6a092f38e231c80a1f144814c90f1895">GeographicLib::Math::sq<T></a>.</li>
<li>Simplify <a class="el" href="geoid.html#geoidinst">Installing the geoid datasets</a><ul>
<li>add geographiclib-get-geoids for Unix-like systems;</li>
<li>add installers for Windows.</li>
</ul>
</li>
<li>Provide cmake support:<ul>
<li>build binary installer for Windows;</li>
<li>include regression tests;</li>
<li>add --input-string, --input-file, --output-file options to the <a class="el" href="utilities.html">Utility programs</a> to support tests.</li>
</ul>
</li>
<li>Rename utility EquidistantTest as <a href="GeodesicProj.1.html">GeodesicProj</a> and TransverseMercatorTest as <a href="TransverseMercatorProj.1.html">TransverseMercatorProj</a>.</li>
<li>Add <a href="ConicProj.1.html">ConicProj</a>.</li>
<li>Reverse the initial sense of the -s option for <a href="Planimeter.1.html">Planimeter</a>.</li>
<li>Migrate source from subversion to <a href="http://geographiclib.git.sf.net/git/gitweb-index.cgi">git</a>.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.8 (released 2011-02-22)<ul>
<li>Optionally return rotation matrix from <a class="el" href="classGeographicLib_1_1Geocentric.html" title="Geocentric coordinates">GeographicLib::Geocentric</a> and <a class="el" href="classGeographicLib_1_1LocalCartesian.html" title="Local Cartesian coordinates.">GeographicLib::LocalCartesian</a>.</li>
<li>For the <a class="el" href="utilities.html">Utility programs</a>, supply man pages, -h prints the synopsis, --help prints the man page, --version prints the version.</li>
<li>Use accurate summation in <a href="Planimeter.1.html">Planimeter</a>.</li>
<li>Add 64-bit targets for Visual Studio 2010.</li>
<li>Use templates for defining math functions and some constants.</li>
<li><a class="el" href="classGeographicLib_1_1Geoid.html" title="Looking up the height of the geoid.">GeographicLib::Geoid</a> updates<ul>
<li>Add <a class="el" href="classGeographicLib_1_1Geoid.html#a2daf81f5c648cf190a83981f441ab08f">GeographicLib::Geoid::DefaultGeoidPath</a> and <a class="el" href="classGeographicLib_1_1Geoid.html#a048865342b2b12ed2272e547209381fd">GeographicLib::Geoid::DefaultGeoidName</a>;</li>
<li><a href="GeoidEval.1.html">GeoidEval</a> uses environment variable GEOID_NAME as the default geoid;</li>
<li>Add --msltohae and --haetomsl as <a href="GeoidEval.1.html">GeoidEval</a> options (and don't document the single hyphen versions).</li>
</ul>
</li>
<li>Remove documentation that duplicates papers on transverse Mercator and geodesics.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.7 (released 2010-12-21)<ul>
<li>FIX BUG in scale returned by <a class="el" href="classGeographicLib_1_1LambertConformalConic.html#a085d37693f5e95fd650b7f59f61ab744">GeographicLib::LambertConformalConic::Reverse</a>.</li>
<li>Add <a class="el" href="classGeographicLib_1_1AlbersEqualArea.html" title="Albers Equal Area Conic Projection.">GeographicLib::AlbersEqualArea</a> projection.</li>
<li>Library created by Visual Studio is Geographic.lib instead of GeographicLib.lib (compatible with makefiles).</li>
<li>Make classes NaN aware.</li>
<li>Use cell arrays for MGRS strings in Matlab.</li>
<li>Add solution/project files for Visual Studio 2010 (32-bit only).</li>
<li>Use C++11 static_assert and math functions, if available.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.6 (released 2010-11-23)<ul>
<li>FIX BUG introduced in <a class="el" href="classGeographicLib_1_1Geoid.html" title="Looking up the height of the geoid.">GeographicLib::Geoid</a> in version 1.5 (found by Dave Edwards).</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.5 (released 2010-11-19)<ul>
<li>Improve area calculations for small polygons.</li>
<li>Add -s and -r flags to <a href="Planimeter.1.html">Planimeter</a>.</li>
<li>Improve the accuracy of <a class="el" href="classGeographicLib_1_1LambertConformalConic.html" title="Lambert Conformal Conic Projection.">GeographicLib::LambertConformalConic</a> using divided differences.</li>
<li>FIX BUG in meridian convergence returned by LambertConformalConic::Forward.</li>
<li>Add optional threadsafe parameter to <a class="el" href="classGeographicLib_1_1Geoid.html" title="Looking up the height of the geoid.">GeographicLib::Geoid</a> constructor. WARNING: This changes may break binary compatibility with previous versions of GeographicLib. However, the library is source compatible.</li>
<li>Add <a class="el" href="classGeographicLib_1_1OSGB.html" title="Ordnance Survey grid system for Great Britain.">GeographicLib::OSGB</a>.</li>
<li>Matlab and Octave interfaces to <a class="el" href="classGeographicLib_1_1UTMUPS.html" title="Convert between Geographic coordinates and UTM/UPS.">GeographicLib::UTMUPS</a>, <a class="el" href="classGeographicLib_1_1MGRS.html" title="Convert between UTM/UPS and MGRS.">GeographicLib::MGRS</a>, <a class="el" href="classGeographicLib_1_1Geoid.html" title="Looking up the height of the geoid.">GeographicLib::Geoid</a>, <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a> provided.</li>
<li>Minor changes<ul>
<li>explicitly turn on optimization in Visual Studio 2008 projects;</li>
<li>add missing dependencies in some Makefiles;</li>
<li>move pi() and degree() from <a class="el" href="classGeographicLib_1_1Constants.html" title="Constants needed by GeographicLib">GeographicLib::Constants</a> to <a class="el" href="classGeographicLib_1_1Math.html" title="Mathematical functions needed by GeographicLib.">GeographicLib::Math</a>;</li>
<li>introduce <a class="el" href="classGeographicLib_1_1Math.html#a436f350a6a9539e176dda19d0e4811f8">GeographicLib::Math::extended</a> type to aid testing;</li>
<li>add GeographicLib::Math::epi() and GeographicLib::Math::edegree().</li>
<li>fixes to compile under cygwin;</li>
<li>tweak expression used to find latitude from conformal latitude.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.4 (released 2010-09-12)<ul>
<li>Changes to <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a> and <a class="el" href="classGeographicLib_1_1GeodesicLine.html" title="A geodesic line.">GeographicLib::GeodesicLine</a>:<ul>
<li>FIX BUG in Geodesic::Inverse with prolate ellipsoids;</li>
<li>add area computations to Geodesic::Direct and Geodesic::Inverse;</li>
<li>add geodesic areas to geodesic test set;</li>
<li>make GeodesicLine constructor public;</li>
<li>change longitude series in Geodesic into Helmert-like form;</li>
<li>ensure that equatorial geodesics have cos(alpha0) = 0 identically;</li>
<li>generalize interface for Geodesic and GeodesicLine;</li>
<li>split GeodesicLine and Geodesic into different files;</li>
<li>signal convergence failure in Geodesic::Inverse with NaNs;</li>
<li>deprecate one function in Geodesic and two functions in GeodesicLine;</li>
<li>deprecate -n option for <a href="Geod.1.html">Geod</a>.</li>
</ul>
WARNING: These changes may break binary compatibility with previous versions of GeographicLib. However, the library is source compatible (with the proviso that <a class="el" href="GeodesicLine_8hpp.html" title="Header for GeographicLib::GeodesicLine class.">GeographicLib/GeodesicLine.hpp</a> may now need to be included).</li>
<li>Add the <a href="Planimeter.1.html">Planimeter</a> utility for computing the areas of geodesic polygons.</li>
<li>Improve iterative solution of <a class="el" href="classGeographicLib_1_1Gnomonic.html#afccbed660a482ef73d33ad16406ee626">GeographicLib::Gnomonic::Reverse</a>.</li>
<li>Add <a class="el" href="classGeographicLib_1_1Geoid.html#adf98d0f0d881893a4f5ff711a3be0e04">GeographicLib::Geoid::ConvertHeight</a>.</li>
<li>Add -msltohae, -haetomsl, and -z options to <a href="GeoidEval.1.html">GeoidEval</a>.</li>
<li>Constructors check that minor radius is positive.</li>
<li>Add overloaded Forward and Reverse functions to the projection classes which don't return the convergence (or azimuth) and scale.</li>
<li>Document function parameters and return values consistently.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.3 (released 2010-07-21)<ul>
<li>Add <a class="el" href="classGeographicLib_1_1Gnomonic.html" title="Gnomonic Projection.">GeographicLib::Gnomonic</a>, the ellipsoid generalization of the gnomonic projection.</li>
<li>Add -g and -e options to <a href="GeodesicProj.1.html">EquidistantTest</a>.</li>
<li>Use fixed-point notation for output from <a href="CartConvert.1.html">CartConvert</a>, <a href="GeodesicProj.1.html">EquidistantTest</a>, <a href="TransverseMercatorProj.1.html">TransverseMercatorTest</a>.</li>
<li>PolarStereographic:<ul>
<li>Improved conversion to conformal coordinates;</li>
<li>Fix bug with scale at opposite pole;</li>
<li>Complain if latitude out of range in SetScale.</li>
</ul>
</li>
<li>Add <a class="el" href="classGeographicLib_1_1Math.html#ad1dc13a367125d3f8d291eaa98339186">GeographicLib::Math::NaN()</a>.</li>
<li>Add long double version of hypot for Windows.</li>
<li>Add EllipticFunction::E(real).</li>
<li>Update references to Geotrans in MGRS documentation.</li>
<li>Speed up tmseries.mac.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.2 (released 2010-05-21)<ul>
<li>FIX BUGS in <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a>,<ul>
<li>wrong azimuth returned by Direct if point 2 is on a pole;</li>
<li>Inverse sometimes fails with very close points.</li>
</ul>
</li>
<li>Improve calculation of scale in <a class="el" href="classGeographicLib_1_1CassiniSoldner.html" title="Cassini-Soldner Projection.">GeographicLib::CassiniSoldner</a>,<ul>
<li>add GeographicLib::GeodesicLine::Scale, <a class="el" href="classGeographicLib_1_1GeodesicLine.html#ad117912c4fc4ef29bf4050c9be3267f2">GeographicLib::GeodesicLine::EquatorialAzimuth</a>, and <a class="el" href="classGeographicLib_1_1GeodesicLine.html#a308c7fb4f7c562a8c604453bf2ee2ca2">GeographicLib::GeodesicLine::EquatorialArc</a>;</li>
<li>break friend connection between CassiniSoldner and Geodesic.</li>
</ul>
</li>
<li>Add <a class="el" href="classGeographicLib_1_1DMS.html#a868248d72f6b0bf2dae18a15d741ac43">GeographicLib::DMS::DecodeAngle</a> and <a class="el" href="classGeographicLib_1_1DMS.html#a0512cc1275e089138e1550efbee421d9">GeographicLib::DMS::DecodeAzimuth</a>. Extend <a class="el" href="classGeographicLib_1_1DMS.html#ae802c666ad53884ce062281409bd78b4">GeographicLib::DMS::Decode</a> and <a class="el" href="classGeographicLib_1_1DMS.html#a0777e26ef4507f8123549723bf3cb56f">GeographicLib::DMS::Encode</a> to deal with distances.</li>
<li>Code and documentation changes in <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a> and <a class="el" href="classGeographicLib_1_1Geocentric.html" title="Geocentric coordinates">GeographicLib::Geocentric</a> for consistency with the forthcoming paper on geodesics.</li>
<li>Increase order of series using in <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a> to 6 (full accuracy maintained for ellipsoid flattening < 0.01).</li>
<li>Macro __NO_LONG_DOUBLE_MATH to disable use of long double.</li>
<li>Correct declaration of <a class="el" href="classGeographicLib_1_1Math.html#af61f7360e67c35131d80083e7b53dda8">GeographicLib::Math::isfinite</a> to return a bool.</li>
<li>Changes in the <a class="el" href="utilities.html">Utility programs</a>,<ul>
<li>improve error reporting when parsing command line arguments;</li>
<li>accept latitudes and longitudes in decimal degrees or degrees, minutes, and seconds, with optional hemisphere designators;</li>
<li><a href="GeoConvert.1.html">GeoConvert</a> -z accepts zone or zone+hemisphere;</li>
<li><a href="GeoidEval.1.html">GeoidEval</a> accepts any of the input formats used by <a href="GeoConvert.1.html">GeoConvert</a>;</li>
<li><a href="CartConvert.1.html">CartConvert</a> allows the ellipsoid to be specified with -e.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.1 (released 2010-02-09)<ul>
<li>FIX BUG (introduced in 2009-03) in EllipticFunction::E(sn,cn,dn).</li>
<li>Increase accuracy of scale calculation in TransverseMercator and TransverseMercatorExact.</li>
<li>Code and documentation changes for consistency with <a href="http://arxiv.org/abs/1002.1417">arXiv:1002.1417</a></li>
</ul>
</li>
</ul>
<ul>
<li>Version 1.0 (released 2010-01-07)<ul>
<li>Add autoconf configuration files.</li>
<li>BUG FIX: Improve initial guess for Newton's method in PolarStereographic::Reverse. (Previously this failed to converge when the co-latitude exceeded about 130 deg.)</li>
<li>Constructors for TransverseMercator, TransverseMercatorExact, PolarStereographic, Geocentric, and Geodesic now check for obvious problems with their arguments and throw an exception if necessary.</li>
<li>Most classes now include inspector functions such as MajorRadius() so that you can determine how instances were constructed.</li>
<li>Add <a class="el" href="classGeographicLib_1_1LambertConformalConic.html" title="Lambert Conformal Conic Projection.">GeographicLib::LambertConformalConic</a> class.</li>
<li>Add <a class="el" href="classGeographicLib_1_1PolarStereographic.html#a3f957214eb1d1248277a680e4c4ceed5">GeographicLib::PolarStereographic::SetScale</a> to allow the latitude of true scale to be specified.</li>
<li>Add solution and project files for Visual Studio 2008.</li>
<li>Add <a class="el" href="classGeographicLib_1_1GeographicErr.html" title="Exception handling for GeographicLib.">GeographicLib::GeographicErr</a> for exceptions.</li>
<li><a class="el" href="classGeographicLib_1_1Geoid.html" title="Looking up the height of the geoid.">GeographicLib::Geoid</a> changes:<ul>
<li>BUG FIX: fix typo in <a class="el" href="classGeographicLib_1_1Geoid.html#ade5715c0d1428a409383b1acd2cbe9be">GeographicLib::Geoid::Cache</a> which could cause a segmentation fault in some cases when the cached area spanned the prime meridian.</li>
<li>Include sufficient edge data to allow heights to be returned for cached area without disk reads;</li>
<li>Add inspector functions to query the extent of the cache.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-11<ul>
<li>Allow specification of "closest UTM zone" in <a class="el" href="classGeographicLib_1_1UTMUPS.html" title="Convert between Geographic coordinates and UTM/UPS.">GeographicLib::UTMUPS</a> and <a href="GeoConvert.1.html">GeoConvert</a> (via -t option).</li>
<li>Utilities now complain is there are too many tokens on input lines.</li>
<li>Include real-to-real versions of <a class="el" href="classGeographicLib_1_1DMS.html#ae802c666ad53884ce062281409bd78b4">GeographicLib::DMS::Decode</a> and <a class="el" href="classGeographicLib_1_1DMS.html#a0777e26ef4507f8123549723bf3cb56f">GeographicLib::DMS::Encode</a>.</li>
<li>More house-cleaning changes:<ul>
<li>Ensure that functions which return results through reference arguments do not alter the arguments when an exception is thrown.</li>
<li>Improve accuracy of <a class="el" href="classGeographicLib_1_1MGRS.html#a91de10ebde478dbb85b3c7d057ff97b9">GeographicLib::MGRS::Forward</a>.</li>
<li>Include more information in some error messages.</li>
<li>Improve accuracy of inverse hyperbolic functions.</li>
<li>Fix the way <a class="el" href="classGeographicLib_1_1Math.html" title="Mathematical functions needed by GeographicLib.">GeographicLib::Math</a> functions handle different precisions.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-10<ul>
<li>Change web site to <a href="http://geographiclib.sourceforge.net">http://geographiclib.sourceforge.net</a></li>
<li>Several house-cleaning changes:<ul>
<li>Change from the a flat directory structure to a more easily maintained one.</li>
<li>Introduce Math class for common mathematical functions (in <a class="el" href="Constants_8hpp.html" title="Header for GeographicLib::Constants class.">Constants.hpp</a>).</li>
<li>Use Math::real as the type for all real quantities. By default this is typedef'ed to double; and the library should be installed this way.</li>
<li>Eliminate const reference members of AzimuthalEquidistant, CassiniSoldner and LocalCartesian so that they may be copied.</li>
<li>Make several constructors explicit. Disallow some constructors. Disallow copy constructor/assignment for Geoid.</li>
<li>Document least squares formulas in <a class="el" href="Geoid_8cpp.html" title="Implementation for GeographicLib::Geoid class.">Geoid.cpp</a>.</li>
<li>Use unsigned long long for files positions of geoid files in Geoid.</li>
<li>Introduce optional mgrslimits argument in UTMUPS::Forward and UTMUPS::Reverse to enforce stricter MGRS limits on eastings and northings.</li>
<li>Add 64-bit targets in Visual Studio project files.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-09<ul>
<li>Add <a class="el" href="classGeographicLib_1_1Geoid.html" title="Looking up the height of the geoid.">GeographicLib::Geoid</a> and <a href="GeoidEval.1.html">GeoidEval</a> utility.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-08<ul>
<li>Add <a class="el" href="classGeographicLib_1_1CassiniSoldner.html" title="Cassini-Soldner Projection.">GeographicLib::CassiniSoldner</a> class and <a href="GeodesicProj.1.html">EquidistantTest</a> utility.</li>
<li>Fix bug in <a class="el" href="classGeographicLib_1_1Geodesic.html#ad7e59a242125a35a95c96cdb20573081">GeographicLib::Geodesic::Inverse</a> where NaNs were sometimes returned.</li>
<li>INCOMPATIBLE CHANGE: AzimuthalEquidistant now returns the reciprocal of the azimuthal scale instead of the reduced length.</li>
<li>Add -n option to <a href="GeoConvert.1.html">GeoConvert</a>.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-07<ul>
<li>Speed up the series inversion code in tmseries.mac and geod.mac.</li>
<li>Reference Borkowski in section on <a class="el" href="geocentric.html">Geocentric coordinates</a>.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-06<ul>
<li>Add routines to decode and encode zone+hemisphere to <a class="el" href="classGeographicLib_1_1UTMUPS.html" title="Convert between Geographic coordinates and UTM/UPS.">GeographicLib::UTMUPS</a>.</li>
<li>Clean up code in <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a>.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-05<ul>
<li>Improvements to <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a>:<ul>
<li>more economical series expansions,</li>
<li>return reduced length (as does the <a href="Geod.1.html">Geod</a> utility),</li>
<li>improved calculation of starting point for inverse method,</li>
<li>use reduced length to give derivative for Newton's method.</li>
</ul>
</li>
<li>Add <a class="el" href="classGeographicLib_1_1AzimuthalEquidistant.html" title="Azimuthal Equidistant Projection.">GeographicLib::AzimuthalEquidistant</a> class.</li>
<li>Make <a class="el" href="classGeographicLib_1_1Geocentric.html" title="Geocentric coordinates">GeographicLib::Geocentric</a>, <a class="el" href="classGeographicLib_1_1TransverseMercator.html" title="Transverse Mercator Projection.">GeographicLib::TransverseMercator</a>, and <a class="el" href="classGeographicLib_1_1PolarStereographic.html" title="Polar Stereographic Projection.">GeographicLib::PolarStereographic</a> classes work with prolate ellipsoids.</li>
<li><a href="CartConvert.1.html">CartConvert</a> checks its inputs more carefully.</li>
<li>Remove reference to defunct Constants.cpp from GeographicLib.vcproj.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-04<ul>
<li>Use compile-time constants to select the order of series in <a class="el" href="classGeographicLib_1_1TransverseMercator.html" title="Transverse Mercator Projection.">GeographicLib::TransverseMercator</a>.</li>
<li>2x unroll of Clenshaw summation to avoid data shuffling.</li>
<li>Simplification of <a class="el" href="classGeographicLib_1_1EllipticFunction.html#a184174d29953891896b41c597c34eb9a">GeographicLib::EllipticFunction::E</a>.</li>
<li>Use STATIC_ASSERT for compile-time checking of constants.</li>
<li>Improvements to <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a>:<ul>
<li>compile-time option to change order of series used,</li>
<li>post Maxima code for generating the series,</li>
<li>tune the order of series for double,</li>
<li>improvements in the selection of starting points for Newton's method,</li>
<li>accept and return spherical arc lengths,</li>
<li>works with both oblate and prolate ellipsoids,</li>
<li>add -a, -e, -b options to the <a href="Geod.1.html">Geod</a> utility.</li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-03<ul>
<li>Add <a class="el" href="classGeographicLib_1_1Geodesic.html" title="Geodesic calculations">GeographicLib::Geodesic</a> and the <a href="Geod.1.html">Geod</a> utility.</li>
<li>Declare when no exceptions are thrown by functions.</li>
<li>Minor changes to <a class="el" href="classGeographicLib_1_1DMS.html" title="Convert between degrees and DMS representation.">GeographicLib::DMS</a> class.</li>
<li>Use invf = 0 to mean a sphere in constructors to some classes.</li>
<li>The makefile creates a library and includes an install target.</li>
<li>Rename GeographicLib::ECEF to <a class="el" href="classGeographicLib_1_1Geocentric.html" title="Geocentric coordinates">GeographicLib::Geocentric</a>, ECEFConvert to <a href="CartConvert.1.html">CartConvert</a>.</li>
<li>Use inline functions to define constant doubles in <a class="el" href="Constants_8hpp.html" title="Header for GeographicLib::Constants class.">Constants.hpp</a>.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-02<ul>
<li>Fix documentation of constructors (flattening -> inverse flattening).</li>
<li>Use std versions of math functions.</li>
<li>Add GeographicLib::ECEF and <a class="el" href="classGeographicLib_1_1LocalCartesian.html" title="Local Cartesian coordinates.">GeographicLib::LocalCartesian</a> classes and the ECEFConvert utility.</li>
<li>Gather the documentation on the <a class="el" href="utilities.html">Utility programs</a> onto one page.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2009-01<ul>
<li>First proper release of library.</li>
<li>More robust <a class="el" href="classGeographicLib_1_1TransverseMercatorExact.html" title="An exact implementation of the Transverse Mercator Projection.">GeographicLib::TransverseMercatorExact</a>:<ul>
<li>Introduce <em>extendp</em> version of constructor,</li>
<li>Test against extended test data,</li>
<li>Optimize starting positions for Newton's method,</li>
<li>Fix behavior near all singularities,</li>
<li>Fix order dependence in C++ start-up code,</li>
<li>Improved method of computing scale and convergence.</li>
</ul>
</li>
<li>Documentation on transverse Mercator projection.</li>
<li>Add <a class="el" href="classGeographicLib_1_1MGRS.html" title="Convert between UTM/UPS and MGRS.">GeographicLib::MGRS</a>, <a class="el" href="classGeographicLib_1_1UTMUPS.html" title="Convert between Geographic coordinates and UTM/UPS.">GeographicLib::UTMUPS</a>, etc.</li>
</ul>
</li>
</ul>
<ul>
<li>Version 2008-09<ul>
<li>Ad hoc posting of information on the transverse Mercator projection.</li>
</ul>
</li>
</ul>
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