百度坐标，但是在国内出于安全等相关因素考虑，在地图发布和出版的时，对WGS84坐标进行了一次非线性加偏，得到的坐标我们称之为GCJ02坐标系，俗称火星坐标，另外国内一些地图厂商出于自身业务和商业需要，在火星坐标系的基础上进行了二次非线性加偏，得到自己的坐标系统；例如BD-09百度坐标系统。
/** * a */ public final static double a = 6378245.0; /** * ee */ public final static double ee = 0.00669342162296594323; //圆周率 GCJ_02_To_WGS_84 public final static double pi = 3.14159265358979324; /** * @Description WGS84 to 火星坐标系 (GCJ-02) * @param lon 经度 * @param lat 纬度 * @return */ public static double[] wgs84_To_Gcj02(double lon, double lat) { 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 double[] { mgLon, mgLat }; } /** * @Description 火星坐标系 (GCJ-02) to WGS84 * @param lon * @param lat * @return */ public static double[] gcj02_To_Wgs84(double lon, double lat) { double[] gps = transform(lat, lon); double lontitude = lon * 2 - gps[1]; double latitude = lat * 2 - gps[0]; return new double[] { lontitude, latitude }; } /** * @Description 火星坐标系 (GCJ-02) to 百度坐标系 (BD-09) * @param gg_lon * @param gg_lat * @return */ public static double[] gcj02_To_Bd09(double gg_lon, double gg_lat) { 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 double[] { bd_lon, bd_lat }; } /** * @Description 百度坐标系 (BD-09) to 火星坐标系 (GCJ-02) * @param bd_lon * @param bd_lat * @return */ public static double[] bd09_To_Gcj02(double bd_lon, double bd_lat) { 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 double[] { gg_lon, gg_lat }; } /** * @Description 百度坐标系 (BD-09) to WGS84 * @param bd_lat * @param bd_lon * @return */ public static double[] bd09_To_Wgs84(double bd_lon,double bd_lat) { double[] gcj02 = bd09_To_Gcj02(bd_lon, bd_lat); double[] map84 = gcj02_To_Wgs84(gcj02[0], gcj02[1]); return map84; } /** * @Description 判断是否在中国范围内 * @param lat * @param lon * @return */ 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; } /** * @Description transform * @param lat * @param lon * @return */ private 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 }; } /** * @Description transformLat * @param x * @param y * @return */ 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; } /** * @Description transformLon * @param x * @param y * @return */ 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; } /** * GPS经纬度转换为 度（3114.1717,12122.1067 → 121.37300779，31.23436014） * @param dms 坐标 * @param type 坐标类型 E/N * @return String 解析后的经纬度 */ public static String gpsToWgs84(String dms, String type) { if (dms == null || dms.equals("")) { return "0.0"; } double result = 0.0D; String temp = ""; if (type.equals("E")) {//经度 String e1 = dms.substring(0, 3);//截取3位数字，经度共3位，最多180度 //经度是一伦敦为点作南北两极的线为0度,所有往西和往东各180度 String e2 = dms.substring(3, dms.length());//需要运算的小数 result = Double.parseDouble(e1); /* System.out.println("e2===="+e2); System.out.println("===="+Double.parseDouble(e2) / 60.0D);*/ result += (Double.parseDouble(e2) / 60.0D); temp = String.valueOf(result); if (temp.length() > 11) { temp = e1 + temp.substring(temp.indexOf("."), 11); } } else if (type.equals("N")) { //纬度，纬度是以赤道为基准,相当于把地球分两半,两个半球面上的点和平面夹角0~90度 String n1 = dms.substring(0, 2);//截取2位，纬度共2位，最多90度 String n2 = dms.substring(2, dms.length()); result = Double.parseDouble(n1); /* System.out.println("n2===="+n2); System.out.println("===="+Double.parseDouble(n2) / 60.0D);*/ result += Double.parseDouble(n2) / 60.0D; temp = String.valueOf(result); if (temp.length() > 10) { temp = n1 + temp.substring(temp.indexOf("."), 10); } } return temp; } /** * * @title 计算点与点的距离 * @param pointA * @param pointB * @description 注意pointA,pointB中的经纬度坐标都是火星坐标 * @return * @author huaqunzi */ public static double distanceToPoint(Point pointA,Point pointB){ //jts提供的几何要素工厂类 GeometryFactory geometryFactory = new GeometryFactory(); //火星坐标(gcj02)转GPS坐标(WGS84) double[] wgsPntA = gcj02_To_Wgs84(pointA.getX(),pointA.getY()); double[] wgsPntB = gcj02_To_Wgs84(pointB.getX(),pointB.getY()); //WGS84->高斯6度分带投影 double[] gaussPntA = wgs84_To_Gauss6(wgsPntA[0], wgsPntA[1]); double[] gaussPntB = wgs84_To_Gauss6(wgsPntB[0], wgsPntB[1]); //通过几何要素工厂得到point实体 Point pntA = geometryFactory.createPoint(new Coordinate(gaussPntA[0], gaussPntA[1])); Point pntB = geometryFactory.createPoint(new Coordinate(gaussPntB[0], gaussPntB[1])); // 两点距离 return pntA.distance(pntB); } /** * @Description WGS84 to 高斯投影(6度分带) * @param longitude 经度 * @param latitude 纬度 * @return double[] x y */ public static double[] wgs84_To_Gauss6(double longitude, double latitude) { int ProjNo = 0; int ZoneWide; // //带宽 double[] output = new double[2]; double longitude1, latitude1, longitude0, X0, Y0, xval, yval; double a, f, e2, ee, NN, T, C, A, M, iPI; iPI = 0.0174532925199433; // //3.1415926535898/180.0; ZoneWide = 6; //6度带宽 a = 6378137.0; f = 1.0 / 298.257223563; //WGS84坐标系参数 //a = 6378245.0;f = 1.0 / 298.3; // 54年北京坐标系参数 // //a=6378140.0; f=1/298.257; //80年西安坐标系参数 ProjNo = (int) (longitude / ZoneWide); longitude0 = (double)(ProjNo * ZoneWide + ZoneWide / 2); longitude0 = longitude0 * iPI; longitude1 = longitude * iPI; // 经度转换为弧度 latitude1 = latitude * iPI; // 纬度转换为弧度 e2 = 2 * f - f * f; ee = e2 / (1.0 - e2); NN = a / Math.sqrt(1.0 - e2 * Math.sin(latitude1) * Math.sin(latitude1)); T = Math.tan(latitude1) * Math.tan(latitude1); C = ee * Math.cos(latitude1) * Math.cos(latitude1); A = (longitude1 - longitude0) * Math.cos(latitude1); M = a * ((1 - e2 / 4 - 3 * e2 * e2 / 64 - 5 * e2 * e2 * e2 / 256) * latitude1 - (3 * e2 / 8 + 3 * e2 * e2 / 32 + 45 * e2 * e2 * e2 / 1024) * Math.sin(2 * latitude1) + (15 * e2 * e2 / 256 + 45 * e2 * e2 * e2 / 1024) * Math.sin(4 * latitude1) - (35 * e2 * e2 * e2 / 3072) * Math.sin(6 * latitude1)); // 因为是以赤道为Y轴的，与我们南北为Y轴是相反的，所以xy与高斯投影的标准xy正好相反; xval = NN * (A + (1 - T + C) * A * A * A / 6 + (5 - 18 * T + T * T + 14 * C - 58 * ee) * A * A * A * A * A / 120); yval = M + NN * Math.tan(latitude1) * (A * A / 2 + (5 - T + 9 * C + 4 * C * C) * A * A * A * A / 24 + (61 - 58 * T + T * T + 270 * C - 330 * ee) * A * A * A * A * A * A / 720); X0 = 1000000L * (ProjNo + 1) + 500000L; Y0 = 0; xval = xval + X0; yval = yval + Y0; output[0] = xval; output[1] = yval; return output; }
