Data from a survey, are shown below. Use either the Rise and Fall method or the Height of Plane of Collimation method to find the reduce level at H. Use arithmetic checks to support your answer. (b) Plot the longitudinal profile using the height against the distance X(Distance) vs Y (reduced level) (c) Draw diagram of the data shown below:

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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.