Civil Engineering - Surveying - Discussion


If θ is the slope of the ground and l is the measured distance, the correction is

[A]. 2l sin2 θ/2
[B]. 2l cos2 θ/2
[C]. 2l tan2 θ/2
[D]. 2l cot2 θ/2.

Answer: Option A


No answer description available for this question.

Danesh said: (Jul 15, 2014)  
Slope correction= L-D.
Here L=l.

So Correction = l-lcos@.
= l(1-cos@).
= 2lsin^@/2.

Vamsi Suppu said: (Sep 29, 2014)  
Slope correction = L-D.

Correction = L-D.
= l-lcos@.
= l(1-cos@).
= l(2sin@/2).

Saravanaraja said: (Jun 29, 2017)  
How D=lcosθ?

Akki said: (Sep 8, 2018)  
D means? Give expansion for the formula.

Priyanka Shah said: (Nov 18, 2018)  

how comes D=I cosθ. Please explain it.

Ameiry Hassan said: (Dec 26, 2018)  
Slope correction = l-D, where l is sloping distance and D horizontal distance, construct a right-angled triangle ABC whose hypotenuse is l, adjacent D and the angle subtended between l and D be theta (θ) solve for D using trigonometric ratio u will get D= lcosθ then recall,

Correction = l-D
= l(1-cos θ)
Using the concept of half angle formula 1-cosθ= 2sin^2θ/2 and therefore correction= 2lsin^2(θ/2).

Kuldeep Kumar said: (Aug 15, 2020)  
Right answer is A.

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