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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: 9781305577398
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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A camera was equipped with a 152mm (6”) focal-length lens is used to take a verticalphotograph from a flying height of 2780m above mean sea level. If the terrain is flat and locatedat an elevation of 500m.a.) What is the scale of the photograph?b.) What would be the scale at mean sea level?
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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_forwardA vertical photograph is taken at an altitude of 1200 m above mean sea level of a terrain flying at an elevation of 80 m. The focal length of camera is 15 cm. The scale of the photograph will be nearlyarrow_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_forward
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- A photograph is to be obtained at a scale of 1:12,500 by aerial photogrammetry. If the focal length of the camera to be used is 7.0 in., determine the height (in ft) at which the aircraft should be flown if the average elevation of the terrain is 860 ft. 7410 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error, ft Need Help? Read Itarrow_forwardAn aerial photograph of a terrain having an average elevation of 1400m is taken at a scale of 1: 7500. The focal length of camera is 15 cm. The flight altitude above MSL isarrow_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
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