2点(緯度座標)の距離を解く

 1 package edu.cloud.editmap.utils;

 2 

 3 import org.junit.Test;

 4 /**

 5  *  

 6  * @author lingfeng

 7  */

 8 public class LatLon2Distance {

 9 

10     // 

11     private static double EARTH_RADIUS = 6378.137;

12     /**

13      *  

14      * @param d

15      * @return

16      */

17     private static double rad(double d)

18     {

19        return d * Math.PI / 180.0;

20     }

21     /**

22      *  

23      * @param lat1

24      * @param lng1

25      * @param lat2

26      * @param lng2

27      * @return

28      */

29     public static double getDistance(double lat1, double lng1, double lat2, double lng2)

30     {

31        double radLat1 = rad(lat1);

32        double radLat2 = rad(lat2);

33        double a = radLat1 - radLat2;

34        double b = rad(lng1) - rad(lng2);

35 

36        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a/2),2) +

37         Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));

38        s = s * EARTH_RADIUS;

39        s = Math.round(s * 10000) / 10000;

40        return s;

41     }

42     

43     @Test

44     public void test(){

45         //System.out.println(getDistance(25.2803229,110.3083241,25.289289679357516,110.30976545104478));

46     }

47 }