Posts tagged 'resection'

W.25 Snellius–Pothenot Resection & Hansen’s Surveying Problem

In Snellius-Pothenot resection, an observer P measuring spreads to three known beacons A, B, C lies on the algebraic intersection of two subtended-spread conics; in Hansen’s problem, knowing one baseline quadrance Q(A, B) and four sighting spreads at unobserved stations C, D determines every side and diagonal quadrance exactly via Triple Spread Systems and Alternate Spreads.