高德地圖座標轉換百度地圖座標-Java

public static Map bd_encrypt(double gg_lat, double gg_lon) {

		double x = gg_lon, y = gg_lat;

		double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * Math.PI);

		double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * Math.PI);

		double bd_lon = z * Math.cos(theta) + 0.0065;

		double bd_lat = z * Math.sin(theta) + 0.006;

		Map map = new HashMap();
		map.put("bd_lon", bd_lon);
		map.put("bd_lat", bd_lat);
		return map;
	}