Find the equal height of towers at triangulation stations A and C so that line AC will clear the elevated ground between A and C by 6m. with the instrument set at point B, the observed vertical angle to ground station A is 0 0 55’ and the vertical angle to ground station C is 0 0 48’. Elevation of A is 237m. Distance AB is 10km and distance of BC is 8.7km. Yhe instrument set-up at B is 2.7m above the ground. Use hcr= 0.067k ^2

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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.