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==In surveying==
In surveying work, the most common methods of computing the [[coordinate]]s of a point by resection are [[Giovanni Domenico Cassini|Cassini's]] Method and the [[Tienstra formula]], though the first known solution was given by [[Willebrord Snellius]] (see [[Snellius–Pothenot problem]]). For the type of precision work involved in surveying, the unmapped point is located by measuring the angles subtended by lines of sight from it to a minimum of three mapped (coordinated) points. In [[geodesy|geodetic]] operations the observations are adjusted for [[spherical excess]] and [[projection variation]]s. Precise angular measurements between lines from the point under ___location using [[theodolite]]s provides more accurate results, with trig beacons erected on high points and hills to enable quick and unambiguous sights to known points.
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