Old Versions

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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 libtool's version numbering scheme using an interface and revision numbers.)

• 1.2 (released 2010-05-21)
  • FIX BUGS in GeographicLib::Geodesic,
    • wrong azimuth returned by Direct if point 2 is on a pole;
    • Inverse sometimes fails with very close points.
  • Improve calculation of scale in GeographicLib::CassiniSoldner,
    • add GeographicLib::GeodesicLine::Scale, GeographicLib::GeodesicLine::EquatorialAzimuth, and GeographicLib::GeodesicLine::EquatorialArc;
    • break friend connection between CassiniSoldner and Geodesic.
  • Add GeographicLib::DMS::DecodeAngle and GeographicLib::DMS::DecodeAzimuth. Extend GeographicLib::DMS::Decode and GeographicLib::DMS::Encode to deal with distances.
  • Code and documentation changes in GeographicLib::Geodesic and GeographicLib::Geocentric for consistency with the forthcoming paper on geodesics.
  • Increase order of series using in GeographicLib::Geodesic to 6 (full accuracy maintained for ellipsoid flattening < 0.01).
  • Macro __NO_LONG_DOUBLE_MATH to disable use of long double.
  • Correct declaration of GeographicLib::Math::isfinite to return a bool.
  • Changes in the Utility Programs,
    • improve error reporting when parsing command line arguments;
    • accept latitudes and longitudes in decimal degrees or degrees, minutes, and seconds, with optional hemisphere designators;
    • GeoConvert -z accepts zone or zone+hemisphere;
    • GeoidEval accepts any of the input formats used by GeoConvert;
    • CartConvert allows the ellipsoid to be specified with -e.

• 1.1 (released 2010-02-09)
  • FIX BUG (introduced in 2009-03) in EllipticFunction::E(sn,cn,dn).
  • Increase accuracy of scale calculation in TransverseMercator and TransverseMercatorExact.
  • Code and documentation changes for consistency with arXiv:1002.1417

• 1.0 (released 2010-01-07)
  • Add autoconf configuration files.
  • 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.)
  • Constructors for TransverseMercator, TransverseMercatorExact, PolarStereographic, Geocentric, and Geodesic now check for obvious problems with their arguments and throw an exception if necessary.
  • Most classes now include inspector functions such as MajorRadius() so that you can determine how instances were constructed.
  • Add GeographicLib::LambertConformalConic class.
  • Add GeographicLib::PolarStereographic::SetScale to allow the latitude of true scale to be specified.
  • Add solution and project files for Visual Studio 2008.
  • Add GeographicLib::GeographicErr for exceptions.
  • GeographicLib::Geoid changes:
    • BUG FIX: fix typo in GeographicLib::Geoid::Cache which could cause a segmentation fault in some cases when the cached area spanned the prime meridian.
    • Include sufficient edge data to allow heights to be returned for cached area without disk reads;
    • Add inspector functions to query the extent of the cache.

• 2009-11
  • Allow specification of "closest UTM zone" in GeographicLib::UTMUPS and GeoConvert (via -t option).
  • Utilities now complain is there are too many tokens on input lines.
  • Include real-to-real versions of GeographicLib::DMS::Decode and GeographicLib::DMS::Encode.
  • More house-cleaning changes:
    • Ensure that functions which return results through reference arguments do not alter the arguments when an exception is thrown.
    • Improve accuracy of GeographicLib::MGRS::Forward.
    • Include more information in some error messages.
    • Improve accuracy of inverse hypobolic functions.
    • Fix the way GeographicLib::Math functions handle different precisions.

• 2009-10
  • Change web site to http://geographiclib.sourceforge.net
  • Several house-cleaning changes:
    • Change from the a flat directory structure to a more easily maintained one.
    • Introduce Math class for common mathematical functions (in Constants.hpp).
    • Use Math::real as the type for all real quantities. By default this is typedefed to double; and the library should be installed this way.
    • Eliminate const reference members of AzimuthalEquidistant, CassiniSoldner and LocalCartesian so that they may be copied.
    • Make several constructors explicit. Disallow some constructors. Disallow copy constructor/assignment for Geoid.
    • Document least square formulas in Geoid.cpp.
    • Use unsigned long long for files positions of geoid files in Geoid.
    • Introduce optional mgrslimits argument in UTMUPS::Forward and UTMUPS::Reverse to enforce stricter MGRS limits on eastings and northings.
    • Add 64-bit targets in Visual Studio project files.

• 2009-09
  • Add GeographicLib::Geoid and GeoidEval utility.

• 2009-08
  • Add GeographicLib::CassiniSoldner class and EquidistantTest utility.
  • Fix bug in GeographicLib::Geodesic::Inverse where NaNs were sometimes returned.
  • INCOMPATIBLE CHANGE: AzimuthalEquidistant now returns the reciprocal of the azimuthal scale instead of the reduced length.
  • Add -n option to GeoConvert.

• 2009-07
  • Speed up the series inversion code in tmseries.mac and geod.mac.
  • Reference Borkowski in section on Geocentric coordinates.

• 2009-06
  • Add routines to decode and encode zone+hemisphere to GeographicLib::UTMUPS.
  • Clean up code in GeographicLib::Geodesic.

• 2009-05
  • Improvements to GeographicLib::Geodesic:
    • more economical series expansions,
    • return reduced length (as does the Geod utility),
    • improved calculation of starting point for inverse method,
    • use reduced length to give derivative for Newton's method.
  • Add GeographicLib::AzimuthalEquidistant class.
  • Make GeographicLib::Geocentric, GeographicLib::TransverseMercator, and GeographicLib::PolarStereographic classes work with prolate ellipsoids.
  • CartConvert checks its inputs more carefully.
  • Remove reference to defunct Constants.cpp from GeographicLib.vcproj.

• 2009-04
  • Use compile-time constants to select the order of series in GeographicLib::TransverseMercator.
  • 2x unroll of Clenshaw summation to avoid data shuffling.
  • Simplification of GeographicLib::EllipticFunction::E.
  • Use STATIC_ASSERT for compile-time checking of constants.
  • Improvements to GeographicLib::Geodesic:
    • compile-time option to change order of series used,
    • post Maxima code for generating the series,
    • tune the order of series for double,
    • improvements in the selection of starting points for Newton's method,
    • accept and return spherical arc lengths,
    • works with both oblate and prolate ellipsoids,
    • add -a, -e, -b options to the Geod utility.

• 2009-03
  • Add GeographicLib::Geodesic and the Geod utility.
  • Declare when no exceptions are thrown by functions.
  • Minor changes to GeographicLib::DMS class.
  • Use invf = 0 to mean a sphere in constructors to some classes.
  • The makefile creates a library and includes an install target.
  • Rename GeographicLib::ECEF to GeographicLib::Geocentric, ECEFConvert to CartConvert.
  • Use inline functions to define constant doubles in Constants.hpp.

• 2009-02
  • Fix documentation of constructors (flattening -> inverse flattening).
  • Use std versions of math functions.
  • Add GeographicLib::ECEF and GeographicLib::LocalCartesian classes and the ECEFConvert utility.
  • Gather the documentation on the utility programs onto one page.

• 2009-01
  • First proper release of library.
  • More robust GeographicLib::TransverseMercatorExact:
    • Introduce extendp version of constructor,
    • Test against extended test data,
    • Optimize starting positions for Newton's method,
    • Fix behavior near all singularities,
    • Fix order dependence in C++ start-up code,
    • Improved method of computing scale and convergence.
  • Documentation on transverse Mercator projection.
  • Add GeographicLib::MGRS, GeographicLib::UTMUPS, etc.

• 2008-09
  • Ad hoc posting of information on the transverse Mercator projection.

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