Civil Engineering MCQAE Level Civil Engineering
The scale of a vertical aerial photograph with focal length f = 150 mm and flying height above datum H = 1500 m is:
SurveyingAerial Photo ScaleMEDIUM
Choose the correct answer
A
1:10,000
B
1:1000
C
1:100,000
D
1:15,000
Correct Answer
A. 1:10,000
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Photo scale = f/H = 0.15 m / 1500 m = 1/10,000 = 1:10,000. If terrain is above datum by h metres: scale at that point = f / (H - h). For relief displacement: d = r x h / H, where r = radial distance from photo centre, h = height of object, H = flying height.
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