获取地球 2个经纬度之间的距离
JAVA源码如下:
private double EARTH_RADIUS = 6378.137; //地球半径 private double rad(double d) { return d * Math.PI / 180.0; //计算弧长 } public double GetDistance(double Lat1,double Lon1,double Lat2,double Lon2 ){ double radLat1 = rad(Lat1); double radLat2 = rad(Lat2); double a =radLat1 - radLat2; double b =rad(Lon1) - rad(Lon2); 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; BigDecimal bg = new BigDecimal(s); double f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); return f1; }
lon1: 122.3 lat1: 37.1 lon2: 122.2 lat2: 37.6 select ROUND( 6378.138*2*ASIN( SQRT( POW( SIN( ( (PI()*37.1/180.0) - (PI()*37.6/180.0) ) /2) ,2) + COS( (PI()*37.1/180.0) ) * COS( (PI()*37.6/180.0) ) * POW( SIN( ( (PI()*122.3/180.0) - (PI()*122.2/180.0) )/2) ,2) ) ),2) as langth;