A vertical photograph of a flat area having an average elevation of 250 metres above mean see level was taken with a camera having a focal length of 20 cm. A section line AB, 250 m long in the area, measures 8.50 cm on the photograph. A tower in the area also appears on the photograph. The distance between the images of top and bottom of tower measures 0.46 cm on the photograph. The distance of the image of the top of the tower from principal axis is 6.46 cm. Determine height of the tower.

Q: An upright aerial photograph is taken using a camera focal length of 150.7 mm, where there are 2…

A:

Q: In a vertical photograph taken from an altitude of 2800 m, a chimney of height 100 m, appears at a…

A: Altitude (H): 2800 mChimney height (h): 100 mDistance of chimney image from principal point (r): 80…

Q: In a vertical photograph taken from an altitude of 2800 m, a chimney of height 100 m, appears at a…

A: Altitude (H): 2800 mChimney height (h): 100 mDistance of chimney image from principal point (r): 80…

Q: The elevation of point A is at 1200' above sea level. What is the elevation of point B if the flying…

A: Scale (s) = 1200/12000                 = 1/10

Q: Given the two orthogonal projections of the object (top view and front view), identify the third…

A:

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: Question- The combined correction due to curvature and refraction (in m) for a distance of 1 km on…

A: Distance d = 1 km,   It is needed to find the combined correction due to curvature & refraction.

Instruments for Surveying

Surveying is the practice that determines the relative three-dimensional positions of many different points on the earth’s surface. There are various instruments used in Surveying like Theodolites, Total station, Tripod stands, Plane table, etc. for measuring horizontal angle, vertical and sloping angle, which are very useful for giving accurate and precise measurement.