计算两个GPS坐标的距离

?? ??///计算两点GPS坐标的距离
?????///?</summary>
?????///?<param?name="n1">第一点的纬度坐标</param>
?????///?<param?name="e1">第一点的经度坐标</param>
?????///?<param?name="n2">第二点的纬度坐标</param>
?????///?<param?name="e2">第二点的经度坐标</param>
?????///?<returns></returns>
????????public?static?double?Distance(double?n1,?double?e1,?double?n2,?double?e2)
????????{
????????????double?jl_jd?=?102834.74258026089786013677476285;
????????????double?jl_wd?=?111712.69150641055729984301412873;
????????????double?b?=?Math.Abs((e1?-?e2)?*?jl_jd);
????????????double?a?=?Math.Abs((n1?-?n2)?*?jl_wd);
????????????return?Math.Sqrt((a?*?a?+?b?*?b));

????????}

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转自:http://www.cnblogs.com/xuanfeng/archive/2010/04/20/1716431.html