GATE Civil Engineering (CE) 2018 Shift 2 Solved Paper

Question : 50 of 65

Marks: +1, -0

An aerial photograph of a terrain having an average elevation of

1400 {m}

is taken at a scale of

1: 7500

. The focal length of the camera is

15 {cm}

. The altitude of the flight above mean sea level (in

{m}

, up to one decimal place) is

Solution:

h=1400 m

Scale

=1: 7500

f=15 {cm}

Scale

=\;{f}/{H-h}

⇒\;{1}/{7500} \;\; =\;{15 × 10^{-2}}/{H-1400}

⇒H \;\; =2525 {m}

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