a) The back and forward tangents of a proposed highway intersect at point Pl station 75+00. The angle of intersection (d

[answerhappygod]

A The Back And Forward Tangents Of A Proposed Highway Intersect At Point Pl Station 75 00 The Angle Of Intersection D 1 (64.93 KiB) Viewed 24 times

a) The back and forward tangents of a proposed highway intersect at point Pl station 75+00. The angle of intersection (deflection angle) lis 18°. It is desired to connect these two tangents by a circular curve which must have an external distance (E) of 20 ft. Find, R, the radius of the curve, Da the degree of the curve, and the stations of the beginning of the curve (TC) and the end of the curve (CT) using the arc definition. b) A bridge, 110 m long, measures 36.67 mm on a vertical photograph. Find the approximate dimensions (in meters) of a large building that also appears and this photograph and whose sides measure 22.00 mm by 18.33 mm. c) Determine the height of the smoke-stack (tower) in front of Colonel By Hall at the University of Ottawa which appears on a vertical photograph taken from an aircraft flying at a height, H, of 7000 ft above its base. The distance from the principal point of this photo to the tower base is 86.52 mm and to the tower top is 88.87 mm. d) A 20-mile strip of terrain is to be photographed for highway mapping. The aerial camera to be used has a lens of focal length 12 in and takes 9x9 inches photographs. The ground elevation varies from a low of 900 ft to a high of 1 100 ft above mean sea level. The plane has to make one flight line and the average width of the photographic coverage is to be 1800 ft. 1. What will be the average scale of the photographs? 2. What flying height, above mean sea level, should be used for this flight?/ 3. If it is specified that the overlap (end lap) between photos be 60% and that 2 extra exposures be added at each end of the flight line, find how many photographs will be required.