Java实现坐标系转换（WGS84、GCJ02、BD09）

系统管理员 2023-06-13 09:37 3阅读 0赞

进行坐标系转换，主要是WGS84(大地坐标系，如谷歌地图)、GCJ02(国测局坐标系，如高德地图)、BD09(百度坐标系)三种主流坐标系之间的转换。  
当然，如高德地图、百度地图都提供了在线的坐标转换服务，如百度的参见：http://lbsyun.baidu.com/index.php?title=webapi/guide/changeposition。

具体转换工具类Java代码如下：

/** * * 坐标系转换工具类 */
    public class GPSUtil { 
    	public static double pi = 3.1415926535897932384626;
    	public static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
    	public static double a = 6378245.0;
    	public static double ee = 0.00669342162296594323;
     
    	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 double[] transform(double lat, double lon) { 
    		if (outOfChina(lat, lon)) { 
    			return new double[] {  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 double[] {  mgLat, mgLon };
    	}
     
    	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;
    	}
     
    	/** * 84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System * * @param lat * @param lon * @return */
    	public static double[] gps84_To_Gcj02(double lat, double lon) { 
    		if (outOfChina(lat, lon)) { 
    			return new double[] {  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 double[] {  mgLat, mgLon };
    	}
     
    	/** * * 火星坐标系 (GCJ-02) to 84 * * @param lon * @param lat * @return * */
    	public static double[] gcj02_To_Gps84(double lat, double lon) { 
    		double[] gps = transform(lat, lon);
    		double lontitude = lon * 2 - gps[1];
    		double latitude = lat * 2 - gps[0];
    		return new double[] {  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 lat * @param lon */
    	public static double[] gcj02_To_Bd09(double lat, double lon) { 
    		double x = lon, y = lat;
    		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);
    		double tempLon = z * Math.cos(theta) + 0.0065;
    		double tempLat = z * Math.sin(theta) + 0.006;
    		double[] gps = {  tempLat, tempLon };
    		return gps;
    	}
     
    	/** * * 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 double[] bd09_To_Gcj02(double lat, double lon) { 
    		double x = lon - 0.0065, y = lat - 0.006;
    		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);
    		double tempLon = z * Math.cos(theta);
    		double tempLat = z * Math.sin(theta);
    		double[] gps = {  tempLat, tempLon };
    		return gps;
    	}
     
    	/** * 将gps84转为bd09 * * @param lat * @param lon * @return */
    	public static double[] gps84_To_bd09(double lat, double lon) { 
    		double[] gcj02 = gps84_To_Gcj02(lat, lon);
    		double[] bd09 = gcj02_To_Bd09(gcj02[0], gcj02[1]);
    		return bd09;
    	}
     
    	public static double[] bd09_To_gps84(double lat, double lon) { 
    		double[] gcj02 = bd09_To_Gcj02(lat, lon);
    		double[] gps84 = gcj02_To_Gps84(gcj02[0], gcj02[1]);
    		// 保留小数点后六位
    		gps84[0] = retain6(gps84[0]);
    		gps84[1] = retain6(gps84[1]);
    		return gps84;
    	}
     
    	/** * 保留小数点后六位 * * @param num * @return */
    	private static double retain6(double num) { 
    		String result = String.format("%.6f", num);
    		return Double.valueOf(result);
    	}
     
    	public static void main(String[] args) { 
    		String str = "113.2362898,21.9053547;113.2353993,21.9076491;113.2352312,21.9079071;113.2345464,21.9086146;113.2342782,21.9089879;113.2341989,21.9093424;113.2342173,21.9101219;113.2345064,21.9118989";
    		String[] arr = str.split(";");
    		String res = "";
    		for(String s : arr) { 
    			String[] lntlat = s.split(",");
    			Double lnt = Double.parseDouble(lntlat[0]);
    			Double lat = Double.parseDouble(lntlat[1]);
    			
    			double[] bd09 = gps84_To_bd09(lnt, lat);
    			res += bd09[0] + "," + bd09[1] + ";";
    		}
    		res = res.substring(0, res.lastIndexOf(";"));
    		System.out.println(res);
    		
    	}
     
    }