Mining Geology, Mine Development and Surveying · Mine Surveying · 1 mark · Numerical answer
A levelling staff reading is 2.25 m, with a 20 cm lateral deflection along the sight direction from its vertical position. Find the corrected reading in metres, to two decimals.
The tilted staff length to the sight point is the hypotenuse 2.25 m and its lateral offset is 0.20 m. Vertical height is √(2.25²−0.20²)=2.24109 m, or 2.24 m. The correction reduces the reading because a tilted staff shows an excessively large sloping length.
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