大地主题解算深度干货-超精

大地主题解算(正算)代码与白塞尔大地主题解算大地主题解算(正算)代码：根据经纬度和方向角以及距离计算另外一点坐标新建模块->拷贝下面的大地主题(正算)代码，调用方法示例：起点经度：116.235(度)终点纬度：37.435(度)方向角：50（度）长度：500（米）终点经纬度（"经度,纬度"）=Computation(37.435,116.235,50,500)Const Pi = 3.1415926535898Private a, b, c, alpha, e, e2, W, V As Double'a长轴半径'b短轴'c极曲率半径'alpha扁率'e第一偏心率'e2第二偏心率'W第一基本纬度函数'V第二基本纬度函数Private B1, L1, B2, L2 As Double'B1点 1 的纬度'L1点 1 的经度'B2点 1 的纬度'L2点 2 的经度Private S As Double'''''大地线长度Private A1, A2 As Double'A1点 1 到点 2 的方位角'A2点 2 到点 1 的方位角Function Computation(STARTLAT, STARTLONG, ANGLE1,DISTANCE As Double) As StringB1 = STARTLATL1 = STARTLONGA1 = ANGLE1S = DISTANCEa = 6378245b = 6356752.3142c = a ^ 2 / balpha = (a - b) / ae = Sqr(a ^ 2 - b ^ 2) / ae2 = Sqr(a ^ 2 - b ^ 2) / bB1 = rad(B1)L1 = rad(L1)A1 = rad(A1)W = Sqr(1 - e ^ 2 * (Sin(B1) ^ 2))V = W * (a / b)Dim W1 As DoubleE1 = e ''''第一偏心率'// 计算起点的归化纬度W1 = W ''Sqr(1 - e1 * e1 * Sin(B1 ) * Sin(B1 ))sinu1 = Sin(B1) * Sqr(1 - E1 * E1) / W1cosu1 = Cos(B1) / W1'// 计算辅助函数值sinA0 = cosu1 * Sin(A1)cotq1 = cosu1 * Cos(A1)sin2q1 = 2 * cotq1 / (cotq1 ^ 2 + 1)cos2q1 = (cotq1 ^ 2 - 1) / (cotq1 ^ 2 + 1)'// 计算系数 AA,BB,CC 及 AAlpha, BBeta 的值。cos2A0 = 1 - sinA0 ^ 2e2 = Sqr(a ^ 2 - b ^ 2) / bk2 = e2 * e2 * cos2A0Dim aa, BB, CC, EE22, AAlpha, BBeta As Doubleaa = b * (1 + k2 / 4 - 3 * k2 * k2 / 64 + 5 * k2 * k2 *k2 / 256)BB = b * (k2 / 8 - k2 * k2 / 32 + 15 * k2 * k2 * k2 /1024)CC = b * (k2 * k2 / 128 - 3 * k2 * k2 * k2 / 512)e2 = E1 * E1AAlpha = (e2 / 2 + e2 * e2 / 8 + e2 * e2 * e2 / 16) -(e2 * e2...