GATE 2016 CE (CE2) – Question 65
A tall tower was photographed from an elevation of 700 m above the datum. The radial distances of the top and bottom of the tower from the principal points are 112.50 mm and 82.40 mm, respectively. If the bottom of the tower is at an elevation 250 m above the datum, then the height (expressed in m) of the tower is _________
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Correct answer: 120 to 121
Explanation
Flying height above the tower base is700−250=450m. Relief displacement is112.50−82.40=30.10mm. Using top radial distance rt, d/rt=h/H, so h=450·30.10/112.50=**120.4m**. Using the bottom radial distance in this version of the formula would be incorrect.