The 'tacheometric surveying' using stadia hairs measures horizontal distance as:
Choose the correct answer
H = KS/cosθ
H = KS cos²θ + C cosθ — inclined sight formula; for horizontal sight H = KS (with K=100, C≈0)
H = S/K (inverse of K)
H = K√S
Correct Answer
B. H = KS cos²θ + C cosθ — inclined sight formula; for horizontal sight H = KS (with K=100, C≈0)
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Tacheometry (stadia method): H = KS cos²θ + C cosθ where K = multiplying constant (=100 for most instruments), S = staff intercept (upper − lower stadia reading), θ = vertical angle from horizontal, C = additive constant (≈0 for internal focusing). For θ=0 (horizontal sight): H = KS. Vertical component V = KS sinθ cosθ + C sinθ = (KS sin2θ)/2. Rapid method for both horizontal and vertical.
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