I can implement Vincenty as I have some of that code as well - at least for WGS84. I am not an expert on projections so I am not sure how to change the code to make it work for any ellipsoid.
On Fri, Mar 17, 2017 at 2:47 PM, Tobias Wendorff < tobias.wendo...@tu-dortmund.de> wrote: > Am Fr, 17.03.2017, 19:21 schrieb C Hamilton: > > How important would it be to implement other geodetic line types ie > > GEODESIC , RHUMB_LINE, and NORMAL_SECTION. > > I > had the code for Great Circle so it was easy to implement, > > but I don't know how to implement the others. > > Try to implement "Vincenty's formulae". It's very easy and much more > accurate than "Great Circle": > > https://en.wikipedia.org/wiki/Vincenty's_formulae > > Perhaps I can give it a try. Did something equal in the past, but > without a GUI :) > > "Great Circle" and "Vincenty" work with any ellipsoid. Projecting the > current CRS to WGS84 first might be faulty. To get more accurate results, > it might be better to use the current ellipsoid. > >
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