1. Complete the table below. STATION BM1 TP1 TP2 TP3 BS 1.80 2.18 2.22 1.50 1.80 2.10 HI 250.40 FS 1.10 1.20 1.80 1.95 2.30 EL 250.20

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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.