On Wed, 20 Feb 2019 10:20:14 +0100 Nicolas Ribot <nicolas.ri...@gmail.com> wrote:
> Hi, > > > > > Sounds useful to me. But i am not sure its so easy given that the > > length of a degree is changing, but there may be some formulas out > > there (even web pages) that calculate great circle distances ... > > mhm... i think somewhere i even used such, once. > > > > Cheers, > > Stefan > > > > Yes, it is based on great circles computation. I used formula from > > this > rather complete page : > https://www.movable-type.co.uk/scripts/latlong.html > > Nicolas That page is a good source. Here's a java implementation: https://sourceforge.net/p/sarmanager/code/HEAD/tree/trunk/SMT/src/net/aa3sd/SMT/math/SphericalUtility.java#l486 with a very basic unit test: https://sourceforge.net/p/sarmanager/code/HEAD/tree/trunk/SMT/src/net/aa3sd/SMT/test/TestSphericalUtilityMethods.java#l64 Derived from the c implementation in xastir https://github.com/Xastir/Xastir/blob/master/src/util.c#L2913 Key choice is what value to use for the mean radius of the Earth. -Paul -- Paul J. Morris Biodiversity Informatics Manager Museum of Comparative Zoölogy, Harvard University m...@morris.net AA3SD PGP public key available _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
