An observer standing on the shoreline of a lake can just see the top of a tower on an island. If the eye of the observer is 1.655m abovelake level and the top of the tower is 15.220m above lake level, how far is the tower from the observer?

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Q: Situation 4] a fishing vessel with a green light on its deck, 7.5 m above the water, disappears from…

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Q: How much refraction correction (in m) required for a distance of 500 m?

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Q: A camera with a focal length of 20 cm fitted in an aircraft is used for taking vertical aerial…

A: Given data: Focal length, f = 20 cm Average elevation of terrain, h = 1200 m Scale, S = 1:8000…

Q: A tall tower was photographed from an elevation of 700 m above the datum. The radial distances of…

A: Given- Flying Height of the aircraft H=700 m, Radial distance r1=112.50 m & ro=82.40 m,…

Q: A tower is photographed from an elevation of 1000 m above datum. The radial distance measured from…

A: Given: A tower is photographed from an elevation of 1000 m above datum. The radial distance measured…

Q: The backsight to a BM is 3.125 m and the FS from the same instrument set up is 3.625 m. If the…

A: Given Data,   Distance from level to BM = 3850 m  Distance from level to TP = 4714.05 mCalculate the…

Q: A horizontal angle is measured with a total station in direct reading as 95° 32' 10". Then the angle…

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Q: To determine the elevation of a detail point, a total station was set up on a traverse station known…

A: orthometric height = 9.456 mreflector with rod = 1.45 mvertical angle = 94.1258 degreehorizontal…

Q: The vertical photograph was exposed with a 60 cm focal length camera at a flying height of 3,000…

A: Given that :- focal length = f =60 cm flying height = H = 3000 m datum height = h = 200 m To…

Q: What should be the height (m) of a lighthouse, so that it can be visible from a distance of 3 km?

A: It has been asked in the question to determine the height of the lighthouse which can be visible…

Q: A vertical photograph is taken at an altitude of 1200 m 'above mean sea level' (a.m.s.l) of a…

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Q: Question 6 A road section of length 2km scale 16 cm on a vertical photograph. The focal length of…

A: Given: A road section of length = 2 km Scale on a vertical photograph = 16 cm Focal length, f = 320…

Q: How does the Aerial photographs can also offer useful data on conditions?

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Q: How is the critical headway determined from field observation data?

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Q: A vertical angle of +12?152'25" is measured to a station at the top of a hill from an instrument…

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Q: Aerial photography was taken at a flying height of 1250m above average terrain. If the camera focal…

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Q: The top of a 108.5m high building 1.22km away was sighted through a total station. The height of the…

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Q: Question A vertical photograph was taken at an altitude of 2000 m above mean sea level. If the scale…

A: Given data- Altitude H=2000 m above mean sea level, Photograph elevation=250 m, Scale S=1:1000, To…

Q: A flagpole appears in two successive photographs taken at an altitude of 2,000 m above datum. The…

A: Given that :- Focal length of the camera = f = 120 mm length of the air base = B  = 200 m Parallax…

Q: Draw the schematic of a tribrach optical plummet?

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Q: What is the minimum height of the communication tower at point B, so that it can be observed from…

A: Horizontal Distance d=100 km

Q: Similar to, except for a 10-m mast and a person whose eye height is 1.5 m above the water's edge. On…

A: (1)Height of eyesight, Height of mast, (2)Height of mast, To find: Distance between shore and the…

Q: A vertical photograph of a flat area having an average elevation of 250 m above mean sea level was…

A: Given data- Average elevation havg=250 mfocal length f=25 cmsection line AB 300 m appears 15 cm on…

Photogrammetry

Photogrammetry is a technology of taking measurements of physical objects present in the environment, using photographs. It includes the process of recording and analyzing a three-dimension image in the two-dimension form. Photogrammetry was invented around 150 years ago in 1851 by Aimé Laussedat, he was also known as the father of photogrammetry, but this method was not in use until 50 years after its invention. This method was first used in Germany by Dr. Albrecht Meydenbauer in 1893 who was the director of the Royal Prussian Photogrammetric institute founded by him.