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Unformatted text preview: otogrammetry (25%)
a) The measured photographic distance ab = 2.5 inch and the corresponding actual ground
distance is AB = 13200 ft. What is the photographic scale? b) A 1:20000 aerial map is obtained using a camera with a focus length of 6 cm. What is the
6 cm hf 20,000 → hf = 6cm(20000) = 1.2 km = c) Compute the area of a triangular parcel of land whose sides measure 50.28 mm, 91.1 mm,
and 68.47 mm on a vertical photograph taken from 6250 ft above the ground with a 150.4
mm focal length camera. Converting the photograph distances to actual distances,
⁄( ) Actual distances: 637.02 m, 1154.2 m, and 867.5 m 7 Using Heron’s formula for the area of an irregular triangle,
A=√ = 284,200 m2
where 1329.35 m is half the perimeter of the triangle 8...
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This note was uploaded on 01/16/2014 for the course CEE 291 taught by Professor Hoopes during the Fall '10 term at Wisconsin.
- Fall '10