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    public class GPSChange    {        private const double pi = 3.14159265358979324;        private const double x_pi = 3.14159265358979324 * 3000.0 / 180.0;        //克拉索天斯基橢球體參數(shù)值        private const double a = 6378245.0;        //第一偏心率        private const double ee = 0.00669342162296594323;        /// <summary>        /// GCJ-02轉(zhuǎn)換BD-09        /// </summary>        /// <param name="gg_lat">緯度</param>        /// <param name="gg_lon">經(jīng)度</param>        /// <returns></returns>        public static GPSPoint GCJ02_to_BD09(double gg_lat, double gg_lon)        {            GPSPoint point = new GPSPoint();            double x = gg_lon, y = gg_lat;            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 bd_lon = z * Math.Cos(theta) + 0.0065;            double bd_lat = z * Math.Sin(theta) + 0.006;            point.SetLat(bd_lat);            point.SetLng(bd_lon);            return point;        }        /// <summary>        /// BD-09轉(zhuǎn)換GCJ-02        /// </summary>        /// <param name="bd_lat">緯度</param>        /// <param name="bd_lon">經(jīng)度</param>        /// <returns></returns>        public static GPSPoint BD09_to_GCJ02(double bd_lat, double bd_lon)        {            GPSPoint point = new GPSPoint();            double x = bd_lon - 0.0065, y = bd_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_lon = z * Math.Cos(theta);            double gg_lat = z * Math.Sin(theta);            point.SetLat(gg_lat);            point.SetLng(gg_lon);            return point;        }        /// <summary>        /// WGS-84轉(zhuǎn)換GCJ-02        /// </summary>        /// <param name="wgLat">緯度</param>        /// <param name="wgLon">經(jīng)度</param>        /// <returns></returns>        public static GPSPoint WGS84_to_GCJ02(double wgLat, double wgLon)        {            GPSPoint point = new GPSPoint();            if (OutOfChina(wgLat, wgLon))            {                point.SetLat(wgLat);                point.SetLng(wgLon);                return point;            }            double dLat = TransformLat(wgLon - 105.0, wgLat - 35.0);            double dLon = TransformLon(wgLon - 105.0, wgLat - 35.0);            double radLat = wgLat / 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 lat = wgLat + dLat;            double lon = wgLon + dLon;            point.SetLat(lat);            point.SetLng(lon);            return point;        }        public static void Transform(double wgLat, double wgLon, double[] latlng)        {            if (OutOfChina(wgLat, wgLon))            {                latlng[0] = wgLat;                latlng[1] = wgLon;                return;            }            double dLat = TransformLat(wgLon - 105.0, wgLat - 35.0);            double dLon = TransformLon(wgLon - 105.0, wgLat - 35.0);            double radLat = wgLat / 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);            latlng[0] = wgLat + dLat;            latlng[1] = wgLon + dLon;        }        private 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;        }        private 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;        }        private 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;        }    }

    public class GPSPoint    {        private double lat;// 緯度        private double lng;// 經(jīng)度        public GPSPoint()        {        }        public GPSPoint(double lng, double lat)        {            this.lng = lng;            this.lat = lat;        }                public double GetLat()        {            return lat;        }        public void SetLat(double lat)        {            this.lat = lat;        }        public double GetLng()        {            return lng;        }        public void SetLng(double lng)        {            this.lng = lng;        }            }