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Introduce formula for Karney's direct geodesic method #486
This pull request introduces the direct geodesic method as proposed by Karney (2011). The following are the highlights of the changes introduced:
However, the tests fail when comparing geodesic scale (M12) with Boost implementation of the direct method. Also, I noticed that using the C++ header
with GeographicLib, GeodSolve CLI, and Boost gave the following results:
I'm not sure why this happens, because
Thanks for this PR!
lon2 is inaccurate with respect to the data set in https://zenodo.org/record/32156 ? How do you know that Geodesic::C3coeff() is more accurate than the function generated from Maxima?
Could you please add this information in the code as a comment for future reference?
Here is the schedule: https://www.boost.org/development/index.html
I think the whole month is too long to keep you wait so I'm ok with merging it now. If needed I'll create a branch for bugfixing based on previous develop state.