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MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305581159
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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Question
Chapter 14, Problem 8P
To determine
The height at which the aircraft should be flown.
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Problem 3.
Question 6
A road section of length 2km
scale 16 cm on a vertical
photograph. The focal length
of the camera is 320mm. If
the terrain is fairly level, then
the flying height will be
km.
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Chapter 14 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
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- An area of 10 km x 20 km is to be surveyed using aerial photogrammetry. Average scale of photograph is 110.000 at ground elevation of 400 m above the datum. Focal length of camera used is 20 cm and size of photographs are 23 cm x 23 cm. The speed of aircraft is 270 kmph. The forward lap in photographs is 70% and side lap is 30%. Determine the flying height, exposure interval and number of photographs required to complete the surveyarrow_forwardAn area of 10 km x 20 km is to be surveyed using aerial photogrammetry Average scale of photograph is 1:10,000 at ground elevation of 400 m above the datum. Focal length of camera used is 20cm and size of photographs are 23cm x 23cm. The speed of aircraft is 270 kmph. The forward lap in photographs is 70% and side lap is 30% Determine the flying height, exposure interval and number of photographs required to complete the survey.arrow_forwardThe vertical photograph was exposed with a 50 cm focal length camera at a flying height of 5,000 meters above datum. If the photo scale is 1 : 2500. What is the elevation of the point from the ground surface?arrow_forward
- A drone is equipped with a small format digital camera that has an APS-H sensor (see image) and a focal length of f = 13 mm. The flying height H’ over an approximately flat terrain is 1500 m. Two stereopairs are to be captured with 65% overlap at the same flying height. See example image below. What is the area of overlap on the ground in square meters?arrow_forwardThe vertical photograph was exposed with a 60 cm focal length camera at a flying height of 3,000 meters above datum. What is the photo scale at point a if the elevation of point A on the ground is 200 m above datum?arrow_forwardAn aerial photograph is taken from a flight at a height of 3.5 km above mean sea level, using a camera of focal length 152 mm. If the average ground elevation is 460 m above mean sea level, then the scale of the photograph isarrow_forward
- Compare the scales of photography for the area recorded and the strip widths given by cameras A and B at the same flying heights. Camera A Camera B Format 180 mm x 180 mm 230 mm x 230 mm Focal length 210 mm 150 mm How many photographs would be taken by the camera A in covering a strip 16 km long at a flying height of 1350 m? The longitudinal overlap is 60%.arrow_forwardThe objective of Photogrammetry is to:arrow_forwardA section line AB appears to be 10.16 cm on a photograph for which the focal length is 16 cm. The corresponding line measures 2.54 cm on a map, which is to a scale 1 The terrain has an average elevation of 200 m above mean sea level. The flying 50,000 altitude of the aircraft above mean sea level during photograph will be (a) 1800 m (c) 2200 m (b) 2000 m (d) 2400 m q22arrow_forward
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