Point 1 having an elevation of 120 m above datum, and 2 is point of unknown elevation. By means of an instrument set 1.20 m above 2, vertical angle is observed that point 1 being 14° 45'. Point 2 is higher than point 1. The horizontal distance between point 1 and 2 is 547.20 m. Making due allowance for earth's curvature and atmospheric refraction. Compute the difference in elevation between point 1 and 2.

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: What are the responsibilities of a project manager of a design-build work?

A: A project manager is a person, who has the whole project responsibility from the successful…

Q: Point A is in between points B and C, the distances of B and C from B and C from point A are 1000m…

A: given data B and C from point A are 1000m and 2000m respectively  The angle of elevation of point B…

Q: From an instrument set up at point A, the angle of elevation of point B is +16°77' while point C is…

A:

Q: Calculate the horizontal distance between point A and B if a slope distance of 3,562.15 feet is…

A: The values given  in the question are as follows: Slope distance between A and B(s)=3562.15 ft…

Q: A tower appears in two successive photographs taken at an altitude of 4000m above the datum. The…

A: Altitude H=4000 m above the datum.Focal length of the camera f=160 mm,Parallax from the top-Pt=72…

Control Survey and Geodetic reductions

Control surveys or survey controls are used to establish reference points as a basis for various construction activities. Vertical and horizontal control points are to be established in a control survey to increase accuracy. After establishing the control points, all other types of surveys such as topographic, right-of-way, aerial mapping, construction layout, boundary surveys, and utility mapping can be worked upon so that control networks can be formed. The place from which the observations are made is called a survey station.