计算两个经纬度的距离

上海市浦东新区乳山路231号
121.533084,31.242315
上海市浦东新区锦绣路1001号
121.558979,31.222046

用sql计算：

SELECT (acos(sin((31.242315*3.1415)/180) * sin((31.222046*3.1415)/180) + cos((31.242315*3.1415)/180) * cos((31.222046*3.1415)/180) * cos((121.533084*3.1415)/180 - (121.558979*3.1415)/180))*6378.137)

参考
select * from 表名 where status=1 and isopen =0 and jingyingtype=1 and waimai=1 and bstatus = 1 and (acos(sin(({$httpData['lat']}*3.1415)/180) * sin((lat*3.1415)/180) + cos(({$httpData['lat']}*3.1415)/180) * cos((lat*3.1415)/180) * cos(({$httpData['lng']}*3.1415)/180 - (lng*3.1415)/180))*6370.996)<=5

用C#代码：

 //地球半径，单位米
        private const double EARTH_RADIUS = 6378137;
        /// <summary>
        /// 计算两点位置的距离，返回两点的距离，单位 米
        /// 该公式为GOOGLE提供，误差小于0.2米
        /// </summary>
        /// <param name="lat1">第一点纬度</param>
        /// <param name="lng1">第一点经度</param>
        /// <param name="lat2">第二点纬度</param>
        /// <param name="lng2">第二点经度</param>
        /// <returns></returns>
        public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
        {
            double radLat1 = Rad(lat1);
            double radLng1 = Rad(lng1);
            double radLat2 = Rad(lat2);
            double radLng2 = Rad(lng2);
            double a = radLat1 - radLat2;
            double b = radLng1 - radLng2;
            double result = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) + Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2))) * EARTH_RADIUS;

            //var result = Math.Round(cal * 10000) / 10000;     //保留小数点后四位
            return result;
        }

        /// <summary>
        /// 经纬度转化成弧度
        /// </summary>
        /// <param name="d"></param>
        /// <returns></returns>
        private static double Rad(double d)
        {
            return (double)d * Math.PI / 180d;
        }

调用 ：

var sec = GetDistance(31.242315, 121.533084, 31.222046, 121.558979);
Console.WriteLine(sec);

参考:

https://www.cnblogs.com/chenkh/p/5661097.html

http://www.itpow.com/c/2016/11/6690.asp

https://www.cnblogs.com/love1226/p/11345351.html