[Geographiclib-announce] GeographicLib 2.1 (released 2022-06-09)

[Charles K. <cha...@gm...>]

Changes between 2.1 (released 2022-06-09) and 2.0 versions:

    * Improve the accuracy of the area calculations in GeodesicExact
      and the Planimeter utility with the -E option.  This now gives
      full double precision accuracy for b/a in [0.01, 100] or f in
      [-99, 0.99].  (Previously the range for full accuracy was b/a in
      [0.5, 2].) The method involves a direct computation of the
      Fourier series for the integrand of area integral which then
      allows the integral to be evaluated.

    * Add a new class DST for doing discrete sine transforms.  This is
      mainly for "internal" use, to compute the area in GeodesicExact.
      Internally, this uses the kissfft package by Mark Borgerding.

    * Fix various warnings from Visual Studio about arithmetic involving
      enums.

    * Minor improvement in the logic for the geodesic inverse problem
      to address a slow down that can occur with
      GEOGRAPHICLIB_PRECISION = 5 due to the time it takes to
      calculate, for example, sin(10^(10^8)) accurately.

-- 
Charles Karney <ch...@ka...>
Princeton, NJ