You need to plan an aerial photography campaign to survey a 4km x 4km area located at an average elevation of 10m above sea level. Your application requires a GSD of 9 cm, an endlap of 60% and a sidelap of 30%. You use a digital camera equipped with a 7500x7500 array of detectors (produces an image that has 7500x7500 pixels) and that has a focal length of 100 mm. The physical size of each detector is 9 mm. The aircraft flies at a ground speed of 160 km/hr. Determine the flight height above sea level Determine the number of frames that you need to acquire (number of frames / flight line and number of flight lines). To do this: Determine the ground coverage of one photo (frame) Determine the ground separation between the principal points of 2 consecutive frames Knowing that the distance between 2 consecutive principal points is determined by the interval of time between 2 shots, calculate the value to set camera’s intervalometer at. Note that the intervalometer is the timer you set on the camera to take photos automatically at equal time steps. You need to set the time such that two consecutive photos are separated by a distance equal to the separation distance calculated in b2. Knowing that the intervalometer can be set to a whole number of seconds, you need to round your answer to a whole number. Would you round up or down? Justify your choice. Does the value of the intervalometer change the ground separation distance between 2 consecutive principal points? If yes, calculate the new distance. Calculate the number of frames in a flight line to cover your study area (4 km). Calculate the ground separation distance between 2 adjacent flight lines. Calculate the number of flight lines needed to cover the study area. Calculate the total number of frames you need to acquire.

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter7: Input/output Technology

Section: Chapter Questions

Problem 19VE

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You need to plan an aerial photography campaign to survey a 4km x 4km area located at an average elevation of 10m above sea level. Your application requires a GSD of 9 cm, an endlap of 60% and a sidelap of 30%. You use a digital camera equipped with a 7500x7500 array of detectors (produces an image that has 7500x7500 pixels) and that has a focal length of 100 mm. The physical size of each detector is 9 mm. The aircraft flies at a ground speed of 160 km/hr.

Determine the flight height above sea level
Determine the number of frames that you need to acquire (number of frames / flight line and number of flight lines). To do this:
- Determine the ground coverage of one photo (frame)
- Determine the ground separation between the principal points of 2 consecutive frames
- Knowing that the distance between 2 consecutive principal points is determined by the interval of time between 2 shots, calculate the value to set camera’s intervalometer at. Note that the intervalometer is the timer you set on the camera to take photos automatically at equal time steps. You need to set the time such that two consecutive photos are separated by a distance equal to the separation distance calculated in b2. Knowing that the intervalometer can be set to a whole number of seconds, you need to round your answer to a whole number. Would you round up or down? Justify your choice.
- Does the value of the intervalometer change the ground separation distance between 2 consecutive principal points? If yes, calculate the new distance.
- Calculate the number of frames in a flight line to cover your study area (4 km).
- Calculate the ground separation distance between 2 adjacent flight lines.
- Calculate the number of flight lines needed to cover the study area.
- Calculate the total number of frames you need to acquire.

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