getRhumbLineDistance method

double getRhumbLineDistance(GeoLocation location)

Returns the rhumb line distance from the current location to the GeoLocation passed in.

@param location the destination location @return the distance in Meters

Implementation

double getRhumbLineDistance(GeoLocation location) {
  double earthRadius = 6378137; // Earth's radius in meters (WGS-84)
  double dLat = radians(location.getLatitude()) - radians(getLatitude());
  double dLon =
      (radians(location.getLongitude()) - radians(getLongitude())).abs();
  double dPhi = log(tan(radians(location.getLatitude()) / 2 + pi / 4) /
      tan(radians(getLatitude()) / 2 + pi / 4));
  double q = dLat / dPhi;

  if (!(q.abs() <= double.maxFinite)) {
    q = cos(radians(getLatitude()));
  }
  // if dLon over 180° take shorter rhumb across 180° meridian:
  if (dLon > pi) {
    dLon = 2 * pi - dLon;
  }
  double d = sqrt(dLat * dLat + q * q * dLon * dLon);
  return d * earthRadius;
}