将空间矩形坐标系（xyz）转换为大地坐标系（经纬度高度）

//空间直角坐标系(xyz)转换大地坐标系(经纬度)
	            double a = 6378137.000;//长半轴
	            double f = 1 / 298.3;//扁率
	            double b = a - a * f;//短半轴
	            double ec = 1 - Math.pow(b, 2) / Math.pow(a, 2);//第一偏心率平方
	            double ecc= ec / (1-ec);//第二偏心率平方
		 double X =-2098813.2676;
	     double Y =4804967.1055;
	     double Z =3619537.1465;
	     double L = Math.atan(Y / X);
	     if (X < 0)
	         L += Math.PI;
	     double r = Math.sqrt(X * X + Y * Y);
	     double B1 = Math.atan(Z / r);
	     double B2;
	     while (true)
	     {
	         double W1 = Math.sqrt(1 - ec * (Math.sin(B1) * Math.sin(B1)));
	         double N1 = a / W1;
	         B2 = Math.atan((Z + N1 * ec * Math.sin(B1)) / r);
	         if (Math.abs(B2 - B1) <= 0.0000000001)
	             break;
	         B1 = B2;
	     }
	    double B = B2;
	     double W = Math.sqrt(1 - ec * (Math.sin(B2) * Math.sin(B2)));
	     double N = a / W;
	     double H = r / Math.cos(B2) - N;
	     System.out.println(L+","+B+","+H);

//大地坐标系(经纬度)转换空间直角坐标系(xyz)
		
		 double L=113.608437;
		 double B=34.802459;
		 double Height=0;
			double a = 6378137.0;              
			double e2 = 0.00669438002290;	//转换为弧度   
			 L = L * PI/180;//经度
			 B = B * PI/180;//纬度

			double fac1 = 1- e2*Math.sin(B)*Math.sin(B);
			double N = a/Math.sqrt(fac1); //卯酉圈曲率半径
			double Daita_h = 0;      //高程异常,默认为0
			double h = Daita_h + Height;
			
			double X = (N+h)*Math.cos(B)*Math.cos(L);
			double Y = (N+h)*Math.cos(B)*Math.sin(L);
			double Z = ( N*(1-e2)+ h ) * Math.sin(B);
			System.out.println(X+","+Y+","+Z);

该方法转换的经纬度有问题，因为我需要的是高度差，所以我只关心了高的标准值。