/// <summary>
/// 将大地坐标转换为高斯平面坐标
/// </summary>
/// <param name="gBLH">大地坐标</param>
/// <returns>高斯平面坐标</returns>
private GeoxyH ConvertBLHToxyH(GeoBLH gBLH)
{
double _h = gBLH.gH;
double X = GeodeticCalculate.LengthOfMeridian(re, gBLH.gB);
double N = GeodeticCalculate.UnitaryCircleRadius(re, gBLH.gB);
double centerL = (gBLH.gL + 3600 * 360.0) % (3600 * 360.0);
int beltNo = (int)(centerL / (6.0 * 3600)) + 1;
centerL = 6.0 * 3600 * beltNo - 3.0 * 3600;
double dl = gBLH.gL - centerL;
double sinB = Math.Sin(gBLH.gB / Angle.Rou);
double cosB = Math.Cos(gBLH.gB / Angle.Rou);
double t2 = Math.Pow(Math.Tan(gBLH.gB / Angle.Rou), 2);
double yita2 = re.firste2 * cosB * cosB;
double x1 = N * sinB * cosB * dl * dl / (2.0 * Angle.Rou * Angle.Rou);
double x2 = N * sinB * Math.Pow(cosB, 3) * (5 - t2 + 9 * yita2 + 4 * yita2 * yita2) * Math.Pow(dl, 4) / (24.0 * Math.Pow(Angle.Rou, 4));
double x3 = N * sinB * Math.Pow(cosB, 5) * (61 - 58 * t2 + t2 * t2) * Math.Pow(dl, 6) / (720.0 * Math.Pow(Angle.Rou, 6));
double y1 = N * cosB * dl / Angle.Rou;
double y2 = N * Math.Pow(cosB, 3) * (1 - t2 + yita2) * Math.Pow(dl, 3) / (6.0 * Math.Pow(Angle.Rou, 3));
double y3 = N * Math.Pow(cosB, 5) * (5 - 18 * t2 + t2 * t2 + 14 * yita2 - 58 * t2 * yita2) * Math.Pow(dl, 5) / (120.0 * Math.Pow(Angle.Rou, 5));
double _x = X + x1 + x2 + x3;
double _y = y1 + y2 + y3 + 500000.0 + beltNo * 1000000.0;
return(new GeoxyH(_x, _y, _h));
}
