WGS84、GCJ02、BD09各坐标系之间的转换算法

深藏阁楼爱情的钟 2022-06-13 05:18 529阅读 0赞

# WGS84、GCJ02、BD09各坐标系之间的转换算法 #

## 坐标解释 ##

*  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。

## 转换代码 ##

Gps.java

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;  
        }  
    }

PositionUtil.java

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(31.239666,121.499809);
            System.out.println("bd :" + bd);
            Gps gcj2 = bd09_To_Gcj02(bd.getWgLat(), bd.getWgLon());
            System.out.println("gcj :" + gcj2);
        }
    }