Gps转高德经纬度坐标

/// <summary>
    /// 转化工具类
    /// </summary>
    public class GPSTransToAMap
    {
        //椭球参数
        static double pi = 3.14159265358979324;
        static double a = 6378245.0;
        static double ee = 0.00669342162296594323;

        /// <summary>
        /// Gps转高德
        /// </summary>
        /// <param name="wgLat">GPS维度</param>
        /// <param name="wgLon">GPS经度</param>
        /// <param name="latlng">转化后的坐标</param>
        public static double[] transform(double wgLat, double wgLon)
        {
            double[] latlng = new double[2];//转化后的坐标
            if (outOfChina(wgLat, wgLon))
            {
                latlng[0] = wgLat;
                latlng[1] = wgLon;
                return latlng;
            }
            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;
            return latlng;
        }

        private static Boolean 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;
        }
        //————————————————
        //版权声明：本文为CSDN博主「m0_38004177」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
        //原文链接：https://blog.csdn.net/m0_38004177/article/details/93974126
    }