GeographicLib 2.1 (released 2022-06-09)

Charles Karney — Thu, 09 Jun 2022 15:05:06 -0000

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.

Recent changes to GeographicLib 2.1 (released 2022-06-09)