On a large lake without waves how far from shore is a sailboat when the top of it's 25' mast disappears from the view a person whose eye height is 4'-3" above the water's edge? Choose the answer that shows the distance in miles with corrections applied for curvature and refraction. O 9.3 miles 6.6 miles 10.1 miles

Q: Problem 4. Point A is in between points B and C, the distances of B and C from B and C from point A…

A:

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.