关于经纬度算法
public Angle se(Angle latA, Angle lonA, TKsoft.Earth.Angle latB, Angle lonB) { //知道 两点经纬度，求角度的方法 double cosLatB = Math.Cos(latB.Radians); Angle tcA = TKsoft.Earth.Angle.FromRadians(Math.Atan2( Math.Sin(lonA.Radians - lonB.Radians) * cosLatB, Math.Cos(latA.Radians) * Math.Sin(latB.Radians) - Math.Sin(latA.Radians) * cosLatB * Math.Cos(lonA.Radians - lonB.Radians))); if (tcA.Radians < 0) tcA.Radians = tcA.Radians + Math.PI * 2; tcA.Radians = Math.PI * 2 - tcA.Radians; return tcA; }
以上代码因项目问题，angle是一个类，各位以此代码 做为参考应该能猜出个大概来（Angle 前缀引用 被 我了）
/** *根据一点、角点(正北0度，顺生针增大)、距离(米)计算另一点 */ public static System.Drawing.PointF CalPoint(double x, double y, double angel, double distance) { // System.Drawing.PointF endPoint = new System.Drawing.PointF(); //角度换算成正东0度，逆时针增大 angel = -angel - 360+90; //米换算成经纬度 var dis = distance / 1000 / 111.7; //角点换成弧度 angel = angel * Math.PI / 180; //计算y坐标 endPoint.Y = (float)(Math.Sin(angel) * dis + y); //计算x坐标 endPoint.X = (float)(Math.Cos(angel) * dis + x); return endPoint; }
/// <summary> /// 计算两个经纬度之间的经纬度差 /// </summary> /// <param name="pt1"></param> /// <param name="pt2"></param> /// <returns></returns> public static double Distance(IPoint pt1, IPoint pt2) { return Distance(pt1.X, pt1.Y, pt2.X, pt2.Y); } /// <summary> /// 计算两个坐标点之间的距离 /// </summary> /// <param name="x"></param> /// <param name="y"></param> /// <param name="tx"></param> /// <param name="ty"></param> /// <returns></returns> public static double Distance(double x, double y, double tx, double ty) { double a = ty - y; double b = tx - x; return Math.Sqrt(a * a + b * b); }
/// <summary> /// 计算起始点和结束点之间的地理方向 /// </summary> /// <param name="start"></param> /// <param name="end"></param> /// <returns></returns> public static double CalcDirection(IPoint start, IPoint end) { return CalcDirection(start.X, start.Y, end.X, end.Y); } public static double CalcDirection(double bX, double bY, double eX, double eY) { double degree = 0; double dx = eX - bX; double dy = eY - bY; if (dx == 0) { if (bY < eY) degree = 0; else degree = 180; } else { degree = Math.Atan(dy / dx) * 180 / Math.PI; if (degree < 0 && bY < eY) degree = 180 + degree; degree = 90 - degree; if (bY > eY && bX > eX) degree += 180; if (degree == 90 && bX > eX) degree += 180; } return degree; }
/// <summary> /// 获取指定纬度线上纬线圈的半径 /// </summary> /// <param name="lat"></param> /// <returns></returns> public static double CalcLatRadius(double lat) { double arc = lat / 180 * Math.PI; return Math.Cos(arc) * DrawArgs.EquatorialRadius; }
/// <summary> /// 求出指定长度的线段在指定纬度圈上的经度跨度 /// </summary> /// <param name="length">长度(或者距离，单位:米)</param> /// <param name="lat">纬度</param> /// <returns></returns> public static double CalcLonSpan(double length, double lat) { double c = 2 * Math.PI * CalcLatRadius(lat); return length / c * 360; }
/// <summary> /// 计算指定长度的线段在纬度跨度 /// </summary> /// <param name="length"></param> /// <returns></returns> public static double CalcLatSpan(double length) { double c = 2 * Math.PI * DrawArgs.EquatorialRadius; return length / c * 360; }
/// <summary> /// 计算num的pwo次幂 /// </summary> /// <param name="num"></param> /// <param name="pow"></param> /// <returns></returns> public static double Pow(double num, int pow) { double result = Convert.ToDouble(num); for (int i = 1; i < pow; i++) { result *= num; } return result; }
//定义角度转化为弧度的函数 public double angle_radian(double[] angle) //角度转化为弧度函数 { double radian; radian = (angle[0] + angle[1] / 60 + angle[2] / 3600) / 180 * PI; return radian; } //定义弧度转化为角度的函数 public double[] radian_angle(double radian) //弧度转化为角度函数 { double degree, minute, second; double[] angle = { 0, 0, 0 }; degree = System.Math.Truncate(radian /PI * 180); minute = System.Math.Truncate((radian / PI * 180 - degree) * 60); second = System.Math.Abs(((radian / PI * 180 - degree) * 60 - minute) * 60); minute = System.Math.Abs(minute); angle[0] = degree; angle[1] = minute; angle[2] = second; return angle; }
public static double E = 0.081813334,PI = Math.PI; //定义常变量 public static double B1, L1, A1, B2, L2, A2, S; //定义主变量 public static double A,B,C,α,β; //定义正算变量 public static double a1, a2, b1, b2; //定义反算变量 //大地主题正算 //大地主题正算 private void button1_Click(object sender, EventArgs e) { double[] Bre1={0,0,0},Lat1={0,0,0},Ang1={0,0,0}, Bre2={0,0,0},Lat2={0,0,0},Ang2={0,0,0}; double W1, sinu1, sinu2, cosu1, sinA0, cotσ1, sin2σ1, cos2σ1,couAo, sin2σ1plusσ0, cos2σ1plusσ0, σ, σ0, λ, δ; Bre1[0] = Convert.ToDouble(textBox1.Text); Bre1[1] = Convert.ToDouble(textBox2.Text);Bre1[2] = Convert.ToDouble(textBox3.Text); Lat1[0] = Convert.ToDouble(textBox4.Text); Lat1[1] = Convert.ToDouble(textBox5.Text);Lat1[2] = Convert.ToDouble(textBox6.Text); Ang1[0] = Convert.ToDouble(textBox7.Text); Ang1[1] = Convert.ToDouble(textBox8.Text); Ang1[2] = Convert.ToDouble(textBox9.Text); S= Convert.ToDouble(textBox10.Text); B1= angle_radian(Bre1);L1= angle_radian(Lat1);A1= angle_radian(Ang1); //计算起点规划纬度 W1 = Math.Sqrt(1.0 - Math.Pow(E *Math.Sin(B1), 2)); sinu1 = (Math.Sin(B1) * Math.Sqrt(1 - E * E)) / W1; cosu1 = Math.Cos(B1) / W1; //计算辅助函数值 sinA0 = cosu1 * Math.Sin(A1); cotσ1 = cosu1 * Math.Cos(A1) / sinu1; sin2σ1 = cotσ1 * 2 / (cotσ1 * cotσ1 + 1); cos2σ1 = (cotσ1 * cotσ1 - 1) / (cotσ1 * cotσ1 + 1); //计算必要系数值 couAo = Math.Sqrt(1 - sinA0 * sinA0); A = 6356863.020 + (10708.949 - 13.474 * couAo * couAo) * couAo * couAo; B = (5354.469 - 8.978 * couAo * couAo) * couAo * couAo; C = (2.238 * couAo * couAo) * couAo * couAo + 0.006; α = (33523299 - (28189 - 70 * couAo * couAo) * couAo * couAo) * Math.Pow(10, -10); β= (14093.5 - 48.5 * couAo * couAo) * couAo * couAo * System.Math.Pow(10, -10); //计算球面长度 σ0 = (S - (B + C * cos2σ1) * sin2σ1) / A; sin2σ1plusσ0 = sin2σ1 * Math.Cos(2 * σ0) + cos2σ1 * Math.Sin(2 * σ0); cos2σ1plusσ0 = cos2σ1 * Math.Cos(2 * σ0) - sin2σ1 * Math.Sin(2 * σ0); σ = σ0 + (B + 5 * C * cos2σ1plusσ0) * sin2σ1plusσ0 / A; //计算经度差改正数 δ = (α * σ + β * (sin2σ1plusσ0 - sin2σ1)) * sinA0; //计算终点大地坐标及坐标方位角 sinu2 = sinu1 * Math.Cos(σ) + cosu1 * Math.Cos(A1) * Math.Sin(σ); B2 = Math.Atan(sinu2 / (Math.Sqrt(1 - E * E) * Math.Sqrt(1 - sinu2 * sinu2))); λ = Math.Atan(Math.Sin(A1) * Math.Sin(σ) / (cosu1 * Math.Cos(σ) - sinu1 * Math.Sin(σ) * Math.Cos(A1))); if (Math.Sin(A1) > 0) { if (Math.Tan(λ) > 0) { λ = Math.Abs(λ); } else { λ = PI - Math.Abs(λ); } } else { if (Math.Tan(λ) < 0) { λ = -Math.Abs(λ); } else { λ = Math.Abs(λ) - PI; } } L2 = L1 + λ - δ; A2 =Math.Atan(cosu1 * Math.Sin(A1) / (cosu1 * Math.Cos(σ) *Math.Cos(A1) - sinu1 *Math.Sin(σ))); if (Math.Sin(A1) < 0) { if (Math.Tan(A2) > 0) { A2 = Math.Abs(A2); } else { A2 = PI - Math.Abs(A2); } } else { if (Math.Tan(A2) > 0) { A2 = PI + Math.Abs(A2); } else { A2 = 2 * PI - Math.Abs(A2); } } //将弧度制角化为角度制角 Bre2 = radian_angle(B2); Lat2 = radian_angle(L2); Ang2 = radian_angle(A2); //通过语句在程序界面显示最后结果 textBox11.Text = Convert.ToString(Bre2[0]); textBox12.Text = Convert.ToString(Bre2[1]); textBox13.Text = Convert.ToString(Bre2[2]); textBox14.Text = Convert.ToString(Lat2[0]); textBox15.Text = Convert.ToString(Lat2[1]); textBox16.Text = Convert.ToString(Lat2[2]); textBox17.Text = Convert.ToString(Ang2[0]); textBox18.Text = Convert.ToString(Ang2[1]); textBox19.Text = Convert.ToString(Ang2[2]); } //大地主题 反算 private void button2_Click(object sender, EventArgs e) { double B1, L1, A1, B2, L2, A2, S; double[] Bre1 = { 0, 0, 0 }, Lat1 = { 0, 0, 0 }, Ang1 = { 0, 0, 0 }, Bre2 = { 0, 0, 0 }, Lat2 = { 0, 0, 0 }, Ang2 = { 0, 0, 0 }; double W1, W2, sinu1, sinu2, cosu1, cosu2, sinA0,cosA0, sinσ, cosσ, σ, λ, L, δ, δ1,p, q, x, y, β1,B11,C11; Bre1[0] = Convert.ToDouble(textBox25.Text); Bre1[1] = Convert.ToDouble(textBox24.Text); Bre1[2] = Convert.ToDouble(textBox23.Text); Lat1[0] = Convert.ToDouble(textBox20.Text); Lat1[1] = Convert.ToDouble(textBox21.Text); Lat1[2] = Convert.ToDouble(textBox22.Text); Bre2[0] = Convert.ToDouble(textBox26.Text); Bre2[1] = Convert.ToDouble(textBox27.Text); Bre2[2] = Convert.ToDouble(textBox28.Text); Lat2[0] = Convert.ToDouble(textBox29.Text); Lat2[1] = Convert.ToDouble(textBox30.Text); Lat2[2] = Convert.ToDouble(textBox31.Text); B1 = angle_radian(Bre1); L1 = angle_radian(Lat1); B2 = angle_radian(Bre2); L2 = angle_radian(Lat2); W1 = Math.Sqrt(1 - E * E * Math.Sin(B1) * Math.Sin(B1)); W2 = Math.Sqrt(1 - E * E * Math.Sin(B2) * Math.Sin(B2)); sinu1 = (Math.Sin(B1) * Math.Sqrt(1 - E * E)) / W1; sinu2 = (Math.Sin(B2) * Math.Sqrt(1 - E * E)) / W2; cosu1 = Math.Cos(B1) / W1; cosu2 = Math.Cos(B2) / W2; L = L2 - L1; a1 = sinu1 * sinu2; a2 = cosu1 * cosu2; b1 = cosu1 * sinu2; b2 = sinu1 * cosu2; //用逐次趋近法计算大地起点大地方位角、球面长度及经差λ=L+δ： δ = 0; λ = 1.0; δ1 = 0; do { δ = δ1; p = cosu2 * Math.Sin(λ); q = b1 - b2 * Math.Cos(λ); A1 = Math.Atan(p / q); if (p > 0) { if (q > 0) { A1 = Math.Abs(A1); } else { A1 = PI - Math.Abs(A1); } } else { if (p < 0) { A1 =PI + Math.Abs(A1); } else { A1 = 2 * PI - Math.Abs(A1); } } sinσ = p * Math.Sin(A1) + q * Math.Cos(A1); cosσ = a1 + a2 * Math.Cos(λ); σ = Math.Atan(sinσ / cosσ); if (cosσ > 0) { σ = Math.Abs(σ); } else { σ = PI - Math.Abs(σ); } sinA0 = cosu1 * Math.Sin(A1); cosA0 = Math.Sqrt(1 - sinA0 * sinA0); x = 2 * a1 - Math.Pow(cosA0, 2) * cosσ; α = (33523299 - (28189 - 70 * cosA0 * cosA0) * cosA0 * cosA0) * Math.Pow(10, -10); β1 = (28189 - 94 * cosA0 * cosA0) * Math.Pow(10, -10); δ1 = (α * σ - β1 * x *Math.Sin(σ)) * sinA0; λ = L + δ1; } while (Math.Abs(δ - δ1) >= Math.Pow(10, -9)); δ = δ1; //计算某些系数 A = 6356863.020 + (10708.949 - 13.474 * cosA0 * cosA0) * cosA0 * cosA0; B11 = 10708.938 - 17.956 * cosA0 * cosA0; C11 = 4.487; //计算大地线长度S y = (Math.Pow(cosA0, 4) - 2 * x * x) * cosσ; S = A * σ + (B11 * x + C11 * y) * sinσ; //计算反方位角A2 p = cosu1 * System.Math.Sin(λ); q = b1 * System.Math.Cos(λ) - b2; A2 = System.Math.Atan(p / q); if (p < 0) { if (q < 0) { A2 = Math.Abs(A2); } else { A2 =PI - Math.Abs(A2); } } else { if (p > 0) { A2 = PI + Math.Abs(A2); } else { A2 = 2 * PI -Math.Abs(A2); } } //将弧度制角转化为角度制角 Ang1 = radian_angle(A1); Ang2 = radian_angle(A2); textBox33.Text = Convert.ToString(Ang1[0]); textBox34.Text = Convert.ToString(Ang1[1]); textBox35.Text = Convert.ToString(Ang1[2]); textBox36.Text = Convert.ToString(Ang2[0]); textBox37.Text = Convert.ToString(Ang2[1]); textBox38.Text = Convert.ToString(Ang2[2]); textBox32.Text = Convert.ToString(S); }
/// <summary> /// 计算两个经纬度之间的球面距离 /// </summary> /// <param Name="p1">p1的经纬度</param> /// <param Name="p2">p2的经纬度</param> /// <returns>距离(单位是米)</returns> public static double Distance(PointF p1, PointF p2) { double _nRslt; double x1 = p1.X * Math.PI / 180.0; double y1 = p1.Y * Math.PI / 180.0; double x2 = p2.X * Math.PI / 180.0; double y2 = p2.Y * Math.PI / 180.0; _nRslt = Math.Sin(y1) * Math.Sin(y2) + Math.Cos(y1) * Math.Cos(y2) * Math.Cos(Math.Abs(x2 - x1)); if (_nRslt < 1) { _nRslt = Math.Atan(-_nRslt / Math.Sqrt(-_nRslt * _nRslt + 1)) + 2.0 * Math.Atan(1); } else { _nRslt = 0.0; } _nRslt = _nRslt * DrawArgs.EquatorialRadius; return _nRslt; }