Improved methods for converting between geodetic and cartesian coordinates on a triaxial ellipsoid

[cffk]

Check out

• https://geographiclib.sourceforge.io/doc/triaxial.html
• https://github.com/geographiclib/geographiclib-octave#readme

The Octave/MATLAB code provides conversions between various coordinate
systems on a triaxial ellipsoid. The cartesian to geodetic conversion
uses the same basic approach as Panou & Korakitis (2022), but Newton's
method is used instead of the bisection method. This speeds up the
conversion considerably. The code for the other conversions is
"cleaner".