Concept explainers
The scale of the first vertical aerial photograph and the flying height of both the photographs.
Answer to Problem 10P
Explanation of Solution
Given information:
Calculation:
Take two control points on a vertical aerial photograph:
Let the length of DE
We have been given the value of BC
For scale two the value of X is found as follows:
Substituting the values, we get
Now, the value of BC
We have the following formula, for scale first:
Substituting the values, we get
Implying that the scale of the first vertical photograph is
Now, the flying height
Where,
The flying height of the first photograph is,
Now, the flying height
Where,
The flying height of the first photograph is,
Conclusion:
Therefore,the scale of the first vertical photograph is
Want to see more full solutions like this?
Chapter 14 Solutions
Traffic and Highway Engineering
- A vertical photograph is taken at an altitude of 1200 m above mean sea level' (ams.l.) of a terrain Lying at an elevation of 80 m (ams.l.) The focal Length of camera is 15 cm. The scale of the photograph will be nearlyarrow_forwardA 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.arrow_forward1. 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?arrow_forward
- An 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_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_forwardAn 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_forward
- 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? (a) 2600 m (b) 3000 m (c) 3200 m (d) 2800 marrow_forwardA vertical photograph was taken, with a camera having a 152.9-mm focal length, from a flying height 2160 m above sea level. What is the scale of the photo at an elevation of 385 m above sea level? What is the datum scale?arrow_forwardA 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_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_forwardA 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_forwardCompare 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_forward
- Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning