/// <summary> /// 通过地图上的两个坐标计算距离(C#版本) /// Add by 成长的小猪(Jason.Song) on 2017/11/01 /// http://blog.csdn.net/jasonsong2008 /// </summary> public class MapHelper { /// <summary> /// 地球半径 /// </summary> private const double EarthRadius = 6378.137; /// <summary> /// 经纬度转化成弧度 /// Add by 成长的小猪(Jason.Song) on 2017/11/01 /// http://blog.csdn.net/jasonsong2008 /// </summary> /// <param name="d"></param> /// <returns></returns> private static double Rad(double d) { return d * Math.PI / 180d; } /// <summary> /// 计算两个坐标点之间的距离 /// Add by 成长的小猪(Jason.Song) on 2017/11/01 /// http://blog.csdn.net/jasonsong2008 /// </summary> /// <param name="firstLatitude">第一个坐标的纬度</param> /// <param name="firstLongitude">第一个坐标的经度</param> /// <param name="secondLatitude">第二个坐标的纬度</param> /// <param name="secondLongitude">第二个坐标的经度</param> /// <returns>返回两点之间的距离,单位:公里/千米</returns> public static double GetDistance(double firstLatitude, double firstLongitude, double secondLatitude, double secondLongitude) { var firstRadLat = Rad(firstLatitude); var firstRadLng = Rad(firstLongitude); var secondRadLat = Rad(secondLatitude); var secondRadLng = Rad(secondLongitude); var a = firstRadLat - secondRadLat; var b = firstRadLng - secondRadLng; var cal = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) + Math.Cos(firstRadLat) * Math.Cos(secondRadLat) * Math.Pow(Math.Sin(b / 2), 2))) * EarthRadius; var result = Math.Round(cal * 10000) / 10000; return result; } //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>返回距离(米)</returns> public static double GetDistance2(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; return result; } /// <summary> /// 计算两个坐标点之间的距离 /// Add by 成长的小猪(Jason.Song) on 2017/11/01 /// http://blog.csdn.net/jasonsong2008 /// </summary> /// <param name="firstPoint">第一个坐标点的(纬度,经度)</param> /// <param name="secondPoint">第二个坐标点的(纬度,经度)</param> /// <returns>返回两点之间的距离,单位:公里/千米</returns> public static double GetPointDistance(string firstPoint, string secondPoint) { var firstArray = firstPoint.Split(','); var secondArray = secondPoint.Split(','); var firstLatitude = Convert.ToDouble(firstArray[0].Trim()); var firstLongitude = Convert.ToDouble(firstArray[1].Trim()); var secondLatitude = Convert.ToDouble(secondArray[0].Trim()); var secondLongitude = Convert.ToDouble(secondArray[1].Trim()); return GetDistance(firstLatitude, firstLongitude, secondLatitude, secondLongitude); } }
https://www.cnblogs.com/chenkh/p/5661097.html
https://www.bbsmax.com/A/amd0QjZjzg/
标签:Rad,double,地图,距离,坐标,var,Math From: https://www.cnblogs.com/shy1766IT/p/16963128.html