WGS84，GCJ02， BD09坐标转换

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public class Gps {    private double wgLat;    private double wgLon;    public Gps(double wgLat, double wgLon) {        setWgLat(wgLat);        setWgLon(wgLon);    }    public double getWgLat() {        return wgLat;    }    public void setWgLat(double wgLat) {        this.wgLat = wgLat;    }    public double getWgLon() {        return wgLon;    }    public void setWgLon(double wgLon) {        this.wgLon = wgLon;    }    @Override    public String toString() {        return wgLat + "," + wgLon;    }}

/** * 各地图API坐标系统比较与转换; * WGS84坐标系：即地球坐标系，国际上通用的坐标系。设备一般包含GPS芯片或者北斗芯片获取的经纬度为WGS84地理坐标系, * 谷歌地图采用的是WGS84地理坐标系（中国范围除外）; * GCJ02坐标系：即火星坐标系，是由中国国家测绘局制订的地理信息系统的坐标系统。由WGS84坐标系经加密后的坐标系。 * 谷歌中国地图和搜搜中国地图采用的是GCJ02地理坐标系; BD09坐标系：即百度坐标系，GCJ02坐标系经加密后的坐标系; * 搜狗坐标系、图吧坐标系等，估计也是在GCJ02基础上加密而成的。 chenhua */public class PositionUtil {    public static final String BAIDU_LBS_TYPE = "bd09ll";    public static double pi = 3.1415926535897932384626;    public static double a = 6378245.0;    public static double ee = 0.00669342162296594323;    /**     * 84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System     *      * @param lat     * @param lon     * @return     */    public static Gps gps84_To_Gcj02(double lat, double lon) {        if (outOfChina(lat, lon)) {            return null;        }        double dLat = transformLat(lon - 105.0, lat - 35.0);        double dLon = transformLon(lon - 105.0, lat - 35.0);        double radLat = lat / 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);        double mgLat = lat + dLat;        double mgLon = lon + dLon;        return new Gps(mgLat, mgLon);    }    /**     * * 火星坐标系 (GCJ-02) to 84 * * @param lon * @param lat * @return     * */    public static Gps gcj_To_Gps84(double lat, double lon) {        Gps gps = transform(lat, lon);        double lontitude = lon * 2 - gps.getWgLon();        double latitude = lat * 2 - gps.getWgLat();        return new Gps(latitude, lontitude);    }    /**     * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 将 GCJ-02 坐标转换成 BD-09 坐标     *      * @param gg_lat     * @param gg_lon     */    public static Gps gcj02_To_Bd09(double gg_lat, double gg_lon) {        double x = gg_lon, y = gg_lat;        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * pi);        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * pi);        double bd_lon = z * Math.cos(theta) + 0.0065;        double bd_lat = z * Math.sin(theta) + 0.006;        return new Gps(bd_lat, bd_lon);    }    /**     * * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 * * 将 BD-09 坐标转换成GCJ-02 坐标 * * @param     * bd_lat * @param bd_lon * @return     */    public static Gps bd09_To_Gcj02(double bd_lat, double bd_lon) {        double x = bd_lon - 0.0065, y = bd_lat - 0.006;        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * pi);        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi);        double gg_lon = z * Math.cos(theta);        double gg_lat = z * Math.sin(theta);        return new Gps(gg_lat, gg_lon);    }    /**     * (BD-09)-->84     * @param bd_lat     * @param bd_lon     * @return     */    public static Gps bd09_To_Gps84(double bd_lat, double bd_lon) {        Gps gcj02 = PositionUtil.bd09_To_Gcj02(bd_lat, bd_lon);        Gps map84 = PositionUtil.gcj_To_Gps84(gcj02.getWgLat(),                gcj02.getWgLon());        return map84;    }    public 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;    }    public static Gps transform(double lat, double lon) {        if (outOfChina(lat, lon)) {            return new Gps(lat, lon);        }        double dLat = transformLat(lon - 105.0, lat - 35.0);        double dLon = transformLon(lon - 105.0, lat - 35.0);        double radLat = lat / 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);        double mgLat = lat + dLat;        double mgLon = lon + dLon;        return new Gps(mgLat, mgLon);    }    public 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;    }    public 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;    }    public static void main(String[] args) {        // 北斗芯片获取的经纬度为WGS84地理坐标 31.426896,119.496145        Gps gps = new Gps(31.426896, 119.496145);        System.out.println("gps :" + gps);        Gps gcj = gps84_To_Gcj02(gps.getWgLat(), gps.getWgLon());        System.out.println("gcj :" + gcj);        Gps star = gcj_To_Gps84(gcj.getWgLat(), gcj.getWgLon());        System.out.println("star:" + star);        Gps bd = gcj02_To_Bd09(gcj.getWgLat(), gcj.getWgLon());        System.out.println("bd  :" + bd);        Gps gcj2 = bd09_To_Gcj02(bd.getWgLat(), bd.getWgLon());        System.out.println("gcj :" + gcj2);    }}

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