Java tutorial
//package com.java2s; //License from project: Apache License public class Main { private static double[] bdToGaoDe(double bd_lat, double bd_lon) { double[] gd_lat_lon = new double[2]; double PI = 3.1415926535897932384626 * 3000.0 / 180.0; double x = bd_lon - 0.0065, y = bd_lat - 0.006; double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * PI); double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * PI); gd_lat_lon[0] = z * Math.cos(theta); gd_lat_lon[1] = z * Math.sin(theta); return gd_lat_lon; } }