球面上两点间大圆劣弧的距离
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<title>谷歌地图计算两经纬度坐标点的距离</title>
<script type="text/javascript">
var EARTH_RADIUS = 6378.137; //地球半径
//将用角度表示的角转换为近似相等的用弧度表示的角 java Math.toRadians
function rad(d) {
return d * Math.PI / 180.0;
}
/**
* 谷歌地图计算两个坐标点的距离
* @param lng1 经度1
* @param lat1 纬度1
* @param lng2 经度2
* @param lat2 纬度2
* @return 距离（千米）
*/
function getDistance(lng1, lat1, lng2, lat2) {
var radLat1 = rad(lat1);
var radLat2 = rad(lat2);
var a = radLat1 - radLat2;
var b = rad(lng1) - rad(lng2);
var 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;
}
alert(getDistance(116.403933,39.914147, 116.403237,39.927919));
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</html>百度地图计算坐标之间的距离: http://www.chajianwo.com/blog-171.html