From point A in between B and C the angles of elevation of B and C are 18°30' and 8º15' respectively. Point C is 2000m from A and B is 1200m from A. Elevation of A is 219.42m above the sea level. Compute the difference in elevation between B and C considering the effect of the earths curvature and refraction (in meters). (answer in 3 decimal places) Compute the difference in elevation between A and C (in meters). (answer in 3 decimal places) Compute the elevation of B (in meters). (answer in 3 decimal places)

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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.