Compute the horizontal distance from a slope distance and a vertical angle.
输入斜距 S 与垂直角 v(度),求水平距离。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Horizontal distance | S = L · cos(alpha), where L is the slope distance and alpha the vertical angle | GB 50026-2020, Code for engineering surveying |
| Height difference | h = L · sin(alpha) | GB 50026-2020, Code for engineering surveying |
| Long-distance corrections | Over long distances, apply curvature and refraction corrections | GB 50026-2020, Code for engineering surveying |
| Check relation | S^2 + h^2 = L^2 serves as a computational check | GB 50026-2020, Code for engineering surveying |