code: function GeoVincenty(height, datum) {
      this.height = Number(height);
      this.datum = datum ? datum : datums.WGS84;
  }
docs: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
  Direct and inverse solutions of geodesics on the ellipsoid using Vincenty formulae.
  
  From: T Vincenty, "Direct and Inverse Solutions of Geodesics on the Ellipsoid with application of
  nested equations", Survey Review, vol XXIII no 176, 1975.
  www.ngs.noaa.gov/PUBS_LIB/inverse.pdf.
  
  @constructor