Item 1 Part A Determine the horizontal distance between two points A and B whose elevations above datum 152.4 mm and the flying height above datum 7900 ft. Express your answer in feet to four significant figures. L= Submit Π| ΑΣΦ Request Answer C 2 ft < 1 of 7 > h 1980 ft and hg = 1425 ft and whose images a and b on a vertical photograph have photo coordinates a = 2.95 in., ya = 2.32 in., z = -1.64 in., and y = -2.66 in. The camera focal length was

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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.