WGS84，GCJ02， BD09坐标转换

public class Gps
    {

        private double wgLat;
        private double wgLon;

        public Gps(double wgLat, double wgLon)
        {
            setWgLat(wgLat);
            setWgLon(wgLon);
        }

        public double getWgLat()
        {
            return wgLat;
        }

        public void setWgLat(double wgLat)
        {
            this.wgLat = wgLat;
        }

        public double getWgLon()
        {
            return wgLon;
        }

        public void setWgLon(double wgLon)
        {
            this.wgLon = wgLon;
        }

        public String toString()
        {
            return wgLat + "," + wgLon;
        }
    }

public class PositionUtil {  
      
    public static String BAIDU_LBS_TYPE = "bd09ll";  
      
    public static double pi = 3.1415926535897932384626;  
    public static double a = 6378245.0;  
    public static double ee = 0.00669342162296594323;  
  
    /** 
     * 84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System 
     *  
     * @param lat 
     * @param lon 
     * @return 
     */  
    public static Gps gps84_To_Gcj02(double lat, double lon) {  
        if (outOfChina(lat, lon)) {  
            return null;  
        }  
        double dLat = transformLat(lon - 105.0, lat - 35.0);  
        double dLon = transformLon(lon - 105.0, lat - 35.0);  
        double radLat = lat / 180.0 * pi;  
        double magic = Math.Sin(radLat);  
        magic = 1 - ee * magic * magic;  
        double sqrtMagic = Math.Sqrt(magic);  
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);  
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.Cos(radLat) * pi);  
        double mgLat = lat + dLat;  
        double mgLon = lon + dLon;  
        return new Gps(mgLat, mgLon);  
    }  
  
    /** 
     * * 火星坐标系 (GCJ-02) to 84 * * @param lon * @param lat * @return 
     * */  
    public static Gps gcj_To_Gps84(double lat, double lon) {  
        Gps gps = transform(lat, lon);  
        double lontitude = lon * 2 - gps.getWgLon();  
        double latitude = lat * 2 - gps.getWgLat();  
        return new Gps(latitude, lontitude);  
    }  
  
    /** 
     * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 将 GCJ-02 坐标转换成 BD-09 坐标 
     *  
     * @param gg_lat 
     * @param gg_lon 
     */  
    public static Gps gcj02_To_Bd09(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 * pi);  
        double theta = Math.Atan2(y, x) + 0.000003 * Math.Cos(x * pi);  
        double bd_lon = z * Math.Cos(theta) + 0.0065;  
        double bd_lat = z * Math.Sin(theta) + 0.006;  
        return new Gps(bd_lat, bd_lon);  
    }  
  
    /** 
     * * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 * * 将 BD-09 坐标转换成GCJ-02 坐标 * * @param 
     * bd_lat * @param bd_lon * @return 
     */  
    public static Gps bd09_To_Gcj02(double bd_lat, double bd_lon) {  
        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);  
        double gg_lon = z * Math.Cos(theta);  
        double gg_lat = z * Math.Sin(theta);  
        return new Gps(gg_lat, gg_lon);  
    }  
  
    /** 
     * (BD-09)-->84 
     * @param bd_lat 
     * @param bd_lon 
     * @return 
     */  
    public static Gps bd09_To_Gps84(double bd_lat, double bd_lon) {  
  
        Gps gcj02 = PositionUtil.bd09_To_Gcj02(bd_lat, bd_lon);  
        Gps map84 = PositionUtil.gcj_To_Gps84(gcj02.getWgLat(),  
                gcj02.getWgLon());  
        return map84;  
  
    }  
  
    public static bool outOfChina(double lat, double lon) {  
        if (lon < 72.004 || lon > 137.8347)  
            return true;  
        if (lat < 0.8293 || lat > 55.8271)  
            return true;  
        return false;  
    }  
  
    public static Gps transform(double lat, double lon) {  
        if (outOfChina(lat, lon)) {  
            return new Gps(lat, lon);  
        }  
        double dLat = transformLat(lon - 105.0, lat - 35.0);  
        double dLon = transformLon(lon - 105.0, lat - 35.0);  
        double radLat = lat / 180.0 * pi;  
        double magic = Math.Sin(radLat);  
        magic = 1 - ee * magic * magic;  
        double sqrtMagic = Math.Sqrt(magic);  
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);  
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.Cos(radLat) * pi);  
        double mgLat = lat + dLat;  
        double mgLon = lon + dLon;  
        return new Gps(mgLat, mgLon);  
    }  
  
    public static double transformLat(double x, double y) {  
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y  
                + 0.2 * Math.Sqrt(Math.Abs(x));  
        ret += (20.0 * Math.Sin(6.0 * x * pi) + 20.0 * Math.Sin(2.0 * x * pi)) * 2.0 / 3.0;  
        ret += (20.0 * Math.Sin(y * pi) + 40.0 * Math.Sin(y / 3.0 * pi)) * 2.0 / 3.0;  
        ret += (160.0 * Math.Sin(y / 12.0 * pi) + 320 * Math.Sin(y * pi / 30.0)) * 2.0 / 3.0;  
        return ret;  
    }  
  
    public static double transformLon(double x, double y) {  
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1  
                * Math.Sqrt(Math.Abs(x));
        ret += (20.0 * Math.Sin(6.0 * x * pi) + 20.0 * Math.Sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.Sin(x * pi) + 40.0 * Math.Sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.Sin(x / 12.0 * pi) + 300.0 * Math.Sin(x / 30.0  
                * pi)) * 2.0 / 3.0;  
        return ret;  
    }  
  
}