code: @Override
      public double calcDist(double fromLat, double fromLon, double toLat, double toLon) {
          double normedDist = calcNormalizedDist(fromLat, fromLon, toLat, toLon);
          return R * 2 * asin(sqrt(normedDist));
      }
docs: Calculates distance of (from, to) in meter.
  <p>
  http://en.wikipedia.org/wiki/Haversine_formula a = sin²(Δlat/2) +
  cos(lat1).cos(lat2).sin²(Δlong/2) c = 2.atan2(√a, √(1−a)) d = R.c