Calculate the height of an object from a baseline when its top and bottom is visible but not accessible from observation points. Case scenario when baseline AB on sloping ground and in line with object.
Baseline distance AB length, height h1 of the observer at points A and B.
Vertical angles measured at A – α1, a2 and δ.
Vertical angles measured at B – β1 and β2.
Solution: Height of object Η.
First, measure horizontal distance AB and vertical angles α1, α2, δ and β1, β2 from observer points A1 and B1 respectively.
In triangle A1ΕB1,
Same for triangle A1OB1,
Then calculate sloping distance A1Ε:
Same for sloping distance A1O:
Given the rate and direction of full dip of a pla...