public static Coordinate bd09ToGcj02(double lng, double lat) {
		double x = lng - 0.0065;
		double y = lat - 0.006;
		double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * X_PI);
		double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * X_PI);
		double gg_lng = z * Math.cos(theta);
		double gg_lat = z * Math.sin(theta);
		return new Coordinate(gg_lng, gg_lat);
	}
@Test
	public void bd09toGcj02Test() {
		final CoordinateUtil.Coordinate coordinate = CoordinateUtil.bd09ToGcj02(116.404, 39.915);
		assertEquals(116.39762729119315D, coordinate.getLng(), 0);
		assertEquals(39.90865673957631D, coordinate.getLat(), 0);
	}