GATE CE 2024 Set 2 — Question 30
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Geomatics Engineering → Photogrammetry → Flying Height
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Question
For a reconnaissance survey, it is necessary to obtain vertical aerial photographs of a terrain at an average scale of using a camera. If the permissible flying height is assumed as above a datum and the average terrain elevation is above the datum, the required focal length (in mm) of the camera is
Correct answer
(B) 150
Solution
The scale () of a vertical aerial photograph is given by the formula:Where:
= focal length of the camera
= flying height above datum =
= average terrain elevation =
= Substituting the values:Converting to mm:Thus, the required focal length is .
= focal length of the camera
= flying height above datum =
= average terrain elevation =
= Substituting the values:Converting to mm:Thus, the required focal length is .
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