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- (e) An area of 150 km × 105 km is to be surveyed using aerial photogrammetry. From the data given below determine number of photographs required to cover complete area; height of flight, spacing of flight lines, ground exposure distance and exposure interval: Size of photograph 23 cm x 23 cm Average scale of photograph = 1 : 25000 Average elevation of terrain = 335 m Longitudinal overlap 65% Side overlap = 28% = - Ground speed of aircraft = 270 km/hr Focal length of camera = 200 mm 0.5 sec Least count of intervalometer =#for DAAG An area of size 180 km x 210 km is to be surveyed by photogrammetry. Determine the number of photographs required to cover the area. Given Format of photograph Scale of photograph = Average terrain elevation = Longitudinal overlap Side overlap = Ground speed of aircraft = Focal length of camera = = 230 mm x 230 mm 1:28000 350 m 60% 30% 310 km/hr 220 mmQ- A photographic survey is carried out to a scale of 1: 20000. A camera with a wide angle lens of f = 170 mm was used with 25 cm × 25 cm plate size for a net 65% overlap along the line of flight. What is the error in height given by an error of 0.15 mm in measuring the parallax of the point ?
- Subject: Surveying Latitude Departure Linear error of closure Relative error of closure Offset2. Under what circumstances would you consider using LiDAR instead of more traditional ground surveying techniques? Why would you choose aerial photogrammetry over LIDAR? 3. Explain how an orthophoto differs from other photographs and the process useThe scale of the photograph is 10cm = 100m. The photograph size is 23cmx23cm determine the number of photographs required to cover an area of 15kmx10 km, if the longitudinal overlap is 60% and side overlap is 720%.
- Space Research and Remote Sensing Organization planned to deploy an aerial mapping technology in the northeastern area of for a national interest project. For conducting the survey, deployed an aircraft equipped with a high-resolution camera. decided that the scale factor of the survey would be used as 1 in: (1000+ X) ft. In the camera, the film holder is 8" x 8". The manufacturer of the camera stated that the focal length of the camera is 6 inches. For the project, it has been decided that the area to be mapped is square, 6 miles on each side. A side-lap from photo to photo of (0.3+ 0.002*(30 – X))*100 % is desired, as well as an end-lap from photo to photo of 60%. The plane travels at 150 mph. X = 0 (i) What is the area covered by each photograph? (ii) At what altitude should the plane fly while taking photographs? (iii) How far apart will the flight paths be? (iv) How many flight paths are required? (v) How many photographs are required per flight path? (vi) How many photographs…Subject: Fundamental Surveying1. why use photogrammetry over traditional surveying? what are its advantages and disadvantages? 2. differentiate a sensor from a platform