improveDistanceMetric

public static GeoPoint improveDistanceMetric(double radius, GeoPoint location,
                                    double degree, DistanceMetric distanceMetric){
    double factor = 0.5;
    double error = radius * 0.01;
    //Constantes de oblación
    double latOblacion = 110540;
    double longOblacion = 111320;
    GeoPoint frontierPoint = new GeoPoint();
    double dLat, dLong, distance;
    do{
        dLat = radius * Math.sin(Math.toRadians(degree)) * factor;
        dLong = radius * Math.cos(Math.toRadians(degree)) * factor;
        frontierPoint.setLatitude(location.getLatitude() + dLat / latOblacion);
        frontierPoint.setLongitude(location.getLongitude() + dLong / (longOblacion
                                * Math.cos(Math.toRadians(location.getLatitude()))));
        distance = distanceMetric.calculateDistance(location, frontierPoint);
        if(distance * 1000 < radius - error){
            factor += 0.01;
        }
        else if(distance * 1000 > radius + error){
            factor -= 0.01;
        }
    }while(!(distance * 1000 > radius - error && distance * 1000 < radius + error));
    return frontierPoint;
}