- package position;
-
- import org.junit.Test;
-
- /**
- * 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。
- *
- * @author chenhua
- *
- */
- public class PositionUtil
- {
- private static double pi = 3.1415926535897932384626;
- private static double a = 6378245.0;
- private static double ee = 0.00669342162296594323;
-
- @Test
- public void t1()
- {
- // 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);
-
- }
-
- /**
- * 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 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);
- }
-
- 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 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);
- }
-
- 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;
- }
-
- }
- package position;
-
- 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;
- }
-
- }
|