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博客园 - Calendar

windows平台下用C#访问HBase Hbase常用命令 CuteEditor测试 Windows 7使用问题 小问题之动态调用另一个程序集里的方法 GM的Hybrid MapPoint批量导入Pushpin的方法 - Calendar - 博客园 地震了 下载试用IE 7.0 Beta 3.0 google maps可以支持地理信息查询了(附上功能介绍) - Calendar - 博客园 prototype理解 - Calendar - 博客园 google maps的脚本值得看看 - Calendar - 博客园 google卫星地图的url计算 linux下运行的eclipse的说明 用socket连接pop3服务器遇到的小问题 google maps又更新了 我是如何取得Reflector的真实程序的 对J2ME的想法 MiniQQ与LumaQQ
通过两个点的经纬度计算距离
Calendar · 2006-07-04 · via 博客园 - Calendar

从google maps的脚本里扒了段代码,没准啥时会用上。大家一块看看是怎么算的。

private const double EARTH_RADIUS = 6378.137;
private static double rad(double d)
{
   return d * Math.PI / 180.0;
}

public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
{
   double radLat1 = rad(lat1);
   double radLat2 = rad(lat2);
   double a = radLat1 - radLat2;
   double b = rad(lng1) - rad(lng2);
   double s = 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)));
   s = s * EARTH_RADIUS;
   s = Math.Round(s * 10000) / 10000;
   return s;
}