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# $Id: NEWS 6817 2010-02-08 14:42:35Z karney $
A reverse chronological list of changes to GeographicLib For more information, see http://geographiclib.sourceforge.net/ The current version of the library is 1.1. Changes between 1.1 (released 2010-02-09) and 1.0 versions: * 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 Changes between 1.0 (released 2010-01-07) and 2009-11 versions: * 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. Changes between 2009-11 and 2009-10 versions: * 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. Changes between 2009-10 and 2009-09 versions: * 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.in + Add 64-bit targets in Visual Studio project files. Changes between 2009-09 and 2009-08 versions: * Add GeographicLib::Geoid and GeoidEval utility. Changes between 2009-08 and 2009-07 versions: * 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. Changes between 2009-07 and 2009-06 versions: * Speed up the series inversion code in tmseries.mac and geod.mac. * Reference Borkowski in section on Geocentric coordinates. Changes between 2009-06 and 2009-05 versions: * Add routines to decode and encode zone+hemisphere to GeographicLib::UTMUPS. * Clean up code in GeographicLib::Geodesic. Changes between 2009-05 and 2009-04 versions: * 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 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. Changes between 2009-04 and 2009-03 versions: * 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 spheroids, + add -a, -e, -b options to the Geod utility. Changes between 2009-03 and 2009-02 versions: * 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. Changes between 2009-02 and 2009-01 versions: * Fix documentation of constructors (flattening -> inverse flattening). * Use std versions of math functions. * Add ECEF and LocalCartesian classes and ECEFConvert utility. * Gather the documentation on the utility programs onto one page. |