6 In the figure shown, if the elevation at index contour "A" is 3100 meters, and the horizontal distance between "B" and "C" is 2.8 km. (NOTE THERE ARE ONLY THREE INTERMEDIATE CONTOUR IN THIS PROBLEM) a) What is the contour interval? 175 m None of the Choices 200 m 150 m 75 m 125 m 100 m 2300

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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.