vincenti distance calculations

[morganherlocker]

While it is a bit slower, it will still be crazy fast. Also it will be more accurate and allow for iterative calculations for linear referencing and routing stuff.

[antoniolocandro]

Maybe this document can help http://www.faa.gov/documentLibrary/media/Order/8260.54A.pdf algorithms and test cases at the end

Also as reference
https://github.com/pkohut/GeoFormulas
https://wired2code.wordpress.com/2010/07/14/wgs84-ellipsoid-calculations/
http://www.pkautomation.com/wgs84_geodesic_calc.html

[jrzimmerman]

I'm currently attempting a direct and inverse version on the vincenty formulas found here:
https://github.com/jrzimmerman/turf-vincenty-direct
https://github.com/jrzimmerman/turf-vincenty-inverse
I'll take all the help I can get! 😄 Sorry for the rookie attempt at helping, in advance

[tmcw]

@jrzimmerman added you to the turfjs team so you can work directly in the turf org!