Compute the azimuth (bearing) from coordinate increments Δx and Δy.
α = atan2(ΔE, ΔN),归算至 0–360°。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Azimuth definition | Grid azimuth α from north clockwise 0°–360°; true vs magnetic north differ by declination | GB 50026-2020 Standard for Engineering Surveying |
| Quadrant conversion | NE: α=θ; SE: α=180°−θ; SW: α=180°+θ; NW: α=360°−θ | Standard surveying-textbook rules |
| Forward/back azimuth | Back = front ± 180° (add if front <180°, else subtract) | Conventional traverse computation |
| Inverse computation | tanα = Δy ÷ Δx with quadrant from the signs of Δx and Δy | Standard control-survey computation |