GATE CE 2018 Set 1 — Question 46
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Geomatics Engineering → Photogrammetry → Flying Height
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Question
A square area (on the surface of the earth) with side 100 m and uniform height, appears as 1 cm 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
Correct answer
(C) 2150 m
Solution
1.Determine the scale of the photograph ():
Ground Area Photo Area
Scale
2.Use the scale formula for a vertical aerial photograph:
Where:
(focal length)
(elevation of the ground)
.
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