java根据几个地点的经纬度，求出这些经纬度的中心点

java根据几个地点的经纬度，求出这些经纬度的中心点

最近项目中需要根据得到的一些地图上点的经纬度，求出这些经纬度的中心点的需求哦，为此写了一个方法。这里给大家分享一下。

public class CenterPoint {

    /**
     *  根据输入的地点坐标计算中心点
     * @param str
     * @return
     */
    public static Map<String,Double> getCenterPoint(String str) {
        String[] arr = str.split(";");
        int total = arr.length;
        double X = 0, Y = 0, Z = 0;
        for(int i=0;i<arr.length;i++){
            double lat, lon, x, y, z;
            lon = Double.parseDouble(arr[i].split(",")[0]) * Math.PI / 180;
            lat = Double.parseDouble(arr[i].split(",")[1]) * Math.PI / 180;
            x = Math.cos(lat) * Math.cos(lon);
            y = Math.cos(lat) * Math.sin(lon);
            z = Math.sin(lat);
            X += x;
            Y += y;
            Z += z;
        }

        X = X / total;
        Y = Y / total;
        Z = Z / total;
        double Lon = Math.atan2(Y, X);
        double Hyp = Math.sqrt(X * X + Y * Y);
        double Lat = Math.atan2(Z, Hyp);

        Map<String,Double> map = new HashMap<String,Double>();
        map.put("lng", Lon * 180 / Math.PI);
        map.put("lat", Lat * 180 / Math.PI);
        return map;
    }

    public static void main(String[] args) {
        String lng_lat = "116.3301,34.42709;116.3326,34.42544;116.3326,34.42443;116.3324,34.4221;116.3365,34.42225;116.3338,34.42206;";
        Map <String,Double>  map = getCenterPoint(lng_lat);
        System.out.println(map.get("lng") +","+ map.get("lat"));//30.589848801178064,118.65923827037791

        String[] arr = lng_lat.split(";");
        int total = arr.length;
        for(int i=0;i<total;i++){

            double distince = GetDistance(Double.parseDouble(arr[i].split(",")[1]), Double.parseDouble(arr[i].split(",")[0]),
                    map.get("lat"), map.get("lng"));

            System.out.println(arr[i]+":"+distince);
        }
    }


    private static double EARTH_RADIUS = 6371.393;
    private static double rad(double d)
    {
        return d * Math.PI / 180.0;
    }

    /**
     * 计算两个经纬度之间的距离
     * @param lat1
     * @param lng1
     * @param lat2
     * @param lng2
     * @return
     */
    public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
    {
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1 - radLat2;
        double b = rad(lng1) - rad(lng2);
        double s = 2 * Math.asin(Math.sqrt(Math.abs(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 * 1000);
        return s;
    }
}

看都看完了，给个关注呗