[Geographiclib-announce] GeographicLib 2.2 (released 2023-03-07)

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

Changes between 2.2 (released 2023-03-07) and 2.1.2 versions:

    * Completely redo Rhumb and RhumbLine classes to yield accurate
      results for the course and the area even for very eccentric
      ellipsoids:
      + these methods are accurate for 1/100 < b/a < 100 (the previous
        methods for the course were limited to 1/4 < b/a < 4 for the
        course and the area calculation was only valid for |f| < 0.01);
      + the meaning of the exact flag in the constructor is now more
        straightforward: exact = false (the default) consistently uses
        series expansions valid for |f| < 0.01; exact = true uses exact
        equations for the course of the rhumb line and an accurate DFT
        fit for the area computation;
      + the RhumbSolve(1) utiity accepts the -u to unroll the
        longitudes for the results of direct calculations;
      + rhumb lines which include a pole as one of the endpoints are
        treated properly (previously point at the pole were moved
        slightly away from the pole);
      + this treatment of rhumb areas is described in polygons,
        https://arxiv.org/abs/2303.03219.

    * The -E option for Planimeter(1) is now a toggle switching on
      exact treatment for geodesics (-G option), rhumb lines (-R
      option), authlatic lines (-Q option).  Previously -E has turned
      on the exact treatment for geodesics.

    * The online version of Planimeter now allows the ellipsoid to be
      specified.

    * The deprecated -l option for GeodSolve and RhumbSolve has been
      removed.

    * Add AuxAngle and AuxLatitude classes to perform accurate
      conversions between auxiliary latitudes.  The Ellipsoid class has
      been mostly reimplimented in terms of the AuxLatitude class.  The
      DAuxLatitude class computes the divides differences of auxiliary
      latitude. and implements additional divided difference formulas
      needed by Rhumb.

    * Created an "experimental" directory + namespace and moved the
      JacobiConformal class there.  Use the cmake target "experimental"
      to build this directory.

-- 
Charles Karney <ch...@ka...>
702 Prospect Ave
Princeton, NJ 08540-4037