Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 14, Problem 11P
To determine
The elevation of the two points A and C and the distance between them.
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Aerial photography is to be taken of a tract of land that is X-mi square. Flying height will be H ft above average terrain, and the camera has focal length f. If the focal plane opening is 9 × 9 in., and minimum sidelap is 40 %, how many flight lines will be needed to cover the tract for the data given below?
Part A:
Express your answer as an integer.
X=9; H=3600ft; f=152.40mm
1. A camera was equipped with a 152mm (6”) focal-length lens is used to take a vertical photograph from a flying height of 2780m above mean sea level. If the terrain is flat and located at an elevation of 500m:
a.) What is the scale of the photograph?
b.) What would be the scale at mean sea level?
A camera with a focal length of 20 cm fitted in an aircraft is used for taking vertical aerial photographs of a terrain. The average elevation of the terrain is 1200 m above mean sea level (MSL). What is the height above MSL at which an aircraft must fly in order to get the aerial photographs at a scale of 1:8000?
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Traffic and Highway Engineering
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