緯度と経度を使用して 2 点間の距離を計算するにはどうすればよいですか?

<code class="java">public static double distance(double lat1, double lon1, double lat2, double lon2) {
    final int R = 6371; // Radius of the earth in kilometers
    
    double latDistance = Math.toRadians(lat2 - lat1);
    double lonDistance = Math.toRadians(lon2 - lon1);
    double a = Math.sin(latDistance / 2) * Math.sin(latDistance / 2)
            + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2))
            * Math.sin(lonDistance / 2) * Math.sin(lonDistance / 2);
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    double distance = R * c * 1000; // convert to meters
    
    return distance;
}</code>

<code class="java">double lat1 = 41.881832;
double lon1 = -87.623177;
double lat2 = 41.889809;
double lon2 = -87.621882;

double distance = distance(lat1, lon1, lat2, lon2);
System.out.println("Distance between the points: " + distance + " meters");</code>