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| public class DistanceCalcUtil {
// 地球半径
private static final double EARTH_RADIUS = 6370996.81;
// 弧度
private static double radian(double d) {
return d * Math.PI / 180.0;
}
/**
* 计算两点之间的距离
*
* @param lat1
* @param lng1
* @param lat2
* @param lng2
* @return
*/
public static double distanceOfTwoPoints(double lat1, double lng1, double lat2, double lng2) {
double radLat1 = radian(lat1);
double radLat2 = radian(lat2);
double a = radLat1 - radLat2;
double b = radian(lng1) - radian(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;
return s;
// s = Math.round(s * 10000) / 10000;
// Integer distance = Integer.parseInt(new
// java.text.DecimalFormat("0").format(s));
// return distance;
}
public static void main(String[] args) {
System.out.println("经度改变1位，测试：");
System.out.println("小数点后6位，精度：0.1米");
System.out.println(distanceOfTwoPoints(24.234532, 124.123223, 24.234532, 124.123224));
System.out.println("小数点后5位，精度：1米");
System.out.println(distanceOfTwoPoints(24.234532, 124.12322, 24.234532, 124.12323));
System.out.println("小数点后4位，精度：10米");
System.out.println(distanceOfTwoPoints(24.234532, 124.1232, 24.234532, 124.1233));
System.out.println("小数点后3位，精度：101米");
System.out.println(distanceOfTwoPoints(24.234532, 124.123, 24.234532, 124.124));
System.out.println("小数点后3位（经纬度同时改变1位），精度：150米");
System.out.println(distanceOfTwoPoints(24.234, 124.123, 24.235, 124.124));
System.out.println("小数点后2位，精度：1014米");
System.out.println(distanceOfTwoPoints(24.234532, 124.12, 24.234532, 124.13));
}
}
|