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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.
A flagpole appears in two successive photographs taken at
an altitude of 2,000 m above datum. The focal length of the
camera is 120 mm and the Length of the air base is 200 m.
The parallax for the top of the pole is 52.52 mm and for the
bottom is 48,27 mm. Find the difference in elevation between
the top and the bottom of the pole,
Surveying instruments
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- Need correct answerarrow_forwardFocal length.arrow_forwardPhotogrammetry Question 3: A tower appears in two successive photographs taken at an altitude of 4000 m above the datum. The focal length of the camera is 160 mm. The parallax for the top and bottom of the pole is 72 mm and 63 mm respectively. If the height of the tower is 25 m then calculate the length of the air base(m).arrow_forward
- A 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_forwardA 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? (a) 2600 m (b) 3000 m (c) 3200 m (d) 2800 marrow_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
- An 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_forwardA line AB on the photograph measures 10.24 cm for which focal length was 15 cm, the corresponding line on the map measures 2.56 cm in a scale of 1/55000. The terrain has an average elevation of 215 m above MSL. Calculate the flight height of the aircraft above MSL when the photograph was taken.arrow_forwardA 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?arrow_forward
- IT IS DESIRED TO LAUNCH A FLIGHT MISSION FOR AN AREA 8 KM WIDE AND 16 KM LONG. THE AIRPLANE HAS A SPEED OF 192 KM/H. A CAMERA WITH A FOCAL LENGTH OF 21 CM IS TO BE USED. THE APPROXIMATE SCALE IS 1: 10,000, THE AVERAGE ELEVATION OF THE GROUND IS 366 M, AND THE PHOTOGRAPHS ARE TO BE 23 CM X 23 CM. THE FORWARD LAP IS 60% AND THE SIDE LAP 25%. ASSUME DIRECTION OF FLIGHT IS ALONG THE LENGTH. CALCULATE: (I) ELEVATION OF FLIGHT (II) EXPOSURE INTERVAL (III) NUMBER OF PHOTOGRAPHarrow_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_forwardA tower appears in two successive photo-graphs taken at an altitude of 4000 m above datum. The focal length of the camera is 160 mm. The length of the air base is 300 m. The parallax for the top and bottom of the pole are 72 mm and 63 mm respectively. The height of the top of the tower above its bottom is nearly 70marrow_forward
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