public static double distancia(RegistroGPS p, RegistroGPS q) {
// instantiate the calculator
GeodeticCalculator geoCalc = new GeodeticCalculator();
// select a reference elllipsoid
Ellipsoid reference = Ellipsoid.WGS84;
// set origin coordinates
GlobalCoordinates origin;
origin = new GlobalCoordinates(p.getLatitud(), p.getLongitud());
// set destination coordinates
GlobalCoordinates destination;
destination = new GlobalCoordinates(q.getLatitud(), q.getLongitud());
// calculate the geodetic curve
GeodeticCurve geoCurve = geoCalc.calculateGeodeticCurve(reference, origin, destination);
return geoCurve.getEllipsoidalDistance();
}
