GATE 2018 CE (CE2) – Question 65
An aerial photograph of terrain with average elevation 1400 m has scale 1:7500. Camera focal length is 15 cm. Flight altitude above mean sea level, to one decimal, is ______ m.
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Correct answer: 2520.0 to 2530.0
Explanation
Photographic scale is $f/(H-h)$. Height above terrain is $7500(0.15)=1125$ m. Adding terrain elevation gives flight altitude $H=1125+1400=2525.0$ m above mean sea level.