public static Coordinate gcj02ToBd09(double lng, double lat) {
		double z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * X_PI);
		double theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * X_PI);
		double bd_lng = z * Math.cos(theta) + 0.0065;
		double bd_lat = z * Math.sin(theta) + 0.006;
		return new Coordinate(bd_lng, bd_lat);
	}
@Test
	public void gcj02ToBd09Test() {
		final CoordinateUtil.Coordinate coordinate = CoordinateUtil.gcj02ToBd09(116.404, 39.915);
		assertEquals(116.41036949371029D, coordinate.getLng(), 0);
		assertEquals(39.92133699351022D, coordinate.getLat(), 0);
	}