Draw a grid 6 in wide by 7 in long with 1-in intersections, and place the given elevations at the intersections in the same arrangement as follows a. Draw the 5-ft contours. 77.0 73.0 68.0 77.0 81.0 85.0 77.0 77.0 71.0 80.0 86.0 83.0 95.0 85.0 80.0 72.0 80.0 95.0 78.0 85.0 89.0 79.0 86.0 77.0 82.0 83.0 73.0 84.0 78.0 80.0 86.0 72.0 73.0 68.0 80.0 80.0 71.0 75.0 79.0 68.0 62.0 72.0 84.0 76.0 68.0 73.0 74.0 67.0 60.0 85.0 73.0 65.0 69.0 72.0 65.0 61.0

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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.