STA. OCC. STA. OBS. DIST. AZIMUTH 3.942 1 B 2.162 198 51 h 13 A 18 51 13 B 3.883 333 58 52 B 153 58 52 A 2.801 120 57 300 57

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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.