/** *  */package utils;/** * 坐标计算的工具类 *  * @author ywf *  */public class PositionUtils {    private static final double EARTH_RADIUS = 6371.004;    static double pi = 3.14159265358979324;    static double a = 6378245.0;    static double ee = 0.00669342162296594323;    static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;    /**     * 将一个点坐标转换为百度坐标     *      * @param point     */    public static double[] transBMapPosition(double wgLat, double wgLon) {        if (wgLat == 0 || wgLon == 0)            return null;        double[] MarsGPS = transform(wgLat, wgLon);        double x = MarsGPS[1], y = MarsGPS[0];        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);        MarsGPS[0] = z * Math.sin(theta) + 0.0060068;        MarsGPS[1] = z * Math.cos(theta) + 0.0065054;        return MarsGPS;    }    // World Geodetic System ==> Mars Geodetic System    private static double[] transform(double wgLat, double wgLon) {        double[] ret = new double[2];        ret[0] = wgLat;        ret[1] = wgLon;        double mgLat, mgLon;        if (outOfChina(wgLat, wgLon)) {            mgLat = wgLat;            mgLon = wgLon;            ret[0] = mgLat;            ret[1] = mgLon;            return ret;        }        double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);        double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);        double radLat = wgLat / 180.0 * pi;        double magic = Math.sin(radLat);        magic = 1 - ee * magic * magic;        double sqrtMagic = Math.sqrt(magic);        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);        mgLat = wgLat + dLat;        mgLon = wgLon + dLon;        ret[0] = mgLat;        ret[1] = mgLon;        return ret;    }    private static boolean outOfChina(double lat, double lon) {        if (lon < 72.004 || lon > 137.8347)            return true;        if (lat < 0.8293 || lat > 55.8271)            return true;        return false;    }    private static double transformLat(double x, double y) {        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y                + 0.2 * Math.sqrt(Math.abs(x));        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;        return ret;    }    private static double transformLon(double x, double y) {        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1                * Math.sqrt(Math.abs(x));        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0                * pi)) * 2.0 / 3.0;        return ret;    }    /**     * @param lat1     *            纬度     * @param lng1     *            经度     * @param lat2     *            纬度     * @param lng2     *            经度     * @return     */    public static double getDistance(double lat1, double lng1, double lat2,            double lng2) {        double radLat1 = lat1;        double radLat2 = lat2;        double a = lng1 - lng2;        double s = Math.acos(Math.cos(radLat1) * Math.cos(radLat2)                * Math.cos(a) + Math.sin(radLat1) * Math.sin(radLat2));        s = s * EARTH_RADIUS * 1000 * Math.PI / 180.0;        return s;    }        /**     * @param lat_a 维度     * @param lng_a 经度     * @param lat_b     * @param lng_b     * @return     */    private static double gps2m(double lat_a, double lng_a, double lat_b, double lng_b) {         double pk = (double) (180/3.14169);         double a1 = lat_a / pk;         double a2 = lng_a / pk;         double b1 = lat_b / pk;         double b2 = lng_b / pk;         double t1 = Math.cos(a1)*Math.cos(a2)*Math.cos(b1)*Math.cos(b2);         double t2 = Math.cos(a1)*Math.sin(a2)*Math.cos(b1)*Math.sin(b2);         double t3 = Math.sin(a1)*Math.sin(b1);         double tt = Math.acos(t1 + t2 + t3);         return 6366000*tt;         }    /**     * 每个点元素为经度，纬度     *      * @param node1     * @param node2     * @return     */    public static double getDistince(double[] node1, double[] node2) {        return getDistance(node1[1], node1[0], node2[1], node2[0]);    }    private static double rad(double d)    {     return d * Math.PI / 180.0;    }    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.pow(Math.sin(a/2),2) +     Math.cos(radLat1)*Math.cos(radLat2)*Math.pow(Math.sin(b/2),2)));     s = s * EARTH_RADIUS*1000;     //s = Math.round(s * 10000) / 10000;     return s;    }    public static void main(String[] args) {        double distance = getDistance(36.74114227294922, 119.14092225294847,  36.70890173661081, 119.12844896818463);        System.out.println(distance);        System.out.println(gps2m(36.74114227294922, 119.14092225294847,  36.70890173661081, 119.12844896818463));        System.out.println(GetDistance(36.74114227294922, 119.14092225294847,  36.70890173661081, 119.12844896818463));        double[] rs = transBMapPosition(36.699466705322266,119.0972188313802);        System.out.println("百度坐标:" + rs[1] + "," + rs[0]);    }}