问题描述

高斯投影正算关于修改椭球参数的问题

    下面是高斯正算的代码，可以实现BL到54的转换，没有问题，我现在要实现BL到80的转换，我应该怎么改椭球参数呢？            const double PI = Math.PI; //定义圆周率    const double rho = 206264.806247096355;    /// <summary>    /// 高斯正算    /// </summary>    /// <param name=""B"">纬度(度)</param>    /// <param name=""L"">经度(度)</param>    /// <param name=""num"">带号</param>    public double[] CalculateEllipse2plane(double Bdouble Ldouble num)    {        AngleCalculate ac = new AngleCalculate(); //用于角度弧度转换        double lL0a0a3a4a5a6nc;        l = 0;L0 = 0;a0 = 0;a3 = 0;a4 = 0;a5 = 0;a6 = 0;n = 0;c = 0;        double xy;        x = 0;y = 0;        double m p;        m = 0;p = 0;        int N;//带号        N = 0;        //判断带号        if(num == 6)        {            N = (int)L/6;//带号            L0 = 6*N-3;//中央子午线        }        else        {            N = (int)((L+1.5)/3); //3度带号            L0 = 3*N;//3度中央子午线        }        bool sign = true;        l = (L - L0) * 3600/rho; //单位秒        if (l < 0) sign = false;        B = ac.AngleToArc(B);//将纬度化为弧度        L = ac.AngleToArc(L);//将经度化为弧度        L0 = ac.AngleToArc(L0);//将中央子午线转为弧度        l = Math.Pow(l2);        c = Math.Pow(Math.Cos(B)2); //Cos(B)的平方        //n = 6399596.651988010- (21562.267 - (108.973 - 0.612 * c) * c) * c;        n = 6399698.902-(21562.267-(108.973-0.612 * c)*c)*c;        a0 = 32140.404-(135.3302-(0.7092-0.0040*c)*c)*c;         a3 =(0.3333333+0.001123*c)*c-0.1666667;        a4 = (0.25+0.00252*c)*c-0.04166;        a5=0.0083-(0.1667-(0.1968+0.004*c)*c)*c;        a6=(0.166*c-0.084)*c;         //计算平面坐标并化为国家统一坐标        m=Math.Sin(B)*Math.Cos(B);        p = 1+(a3+a5*l)*l;        x=6367558.4969*B-(a0-(0.5+(a4+a6*l)*l)*l*n)*m;        y=(p)*Math.Sqrt(l)*n*Math.Cos(B);        if (sign)        {            y = y + 500000 + N * 1000000; //加上常数改正，和带号        }        else        {            y =  (500000 - y) + N * 1000000; //加上常数改正，和带号        }        double[] CalculateResult = new double[2];        CalculateResult[0] = x;        CalculateResult[1] = y;        return CalculateResult;    }

解决方案

http://blog.163.com/lisoaring@126/blog/static/192056062013218101823592/