GATE Civil Engineering (CE) 2018 Shift 1 Solved Paper

Question : 61 of 65

Marks: +1, -0

A square area (on the surface on the earth) with side

100 {m}

and uniform height, appears as

1 {cm}^{2}

on a vertical aerial photograph. The topographic map shows that a contour of

650 {m}

passes through the area. If focal length of the camera lens is

150 {mm}

, the height from which the aerial photograph was taken, is

Solution:

A=100 × 100 {m}^{2}

Area on photo,

\;\; a=1 {cm}^{2}

Scale

1 {cm}=100 {m}

f=150 {mm}

h=650 {m}

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