Based from the Figure, a vertical angle of +13°45’ is read to a target 1.23 m above point B. The measured inclined distance S is 823.29 m and the elevation of point A is 123.65 m above the datum. The height of the instrument at A is 1.35 m. Consider the effect of earth’s curvature and refraction. Determine the difference in elevation between A and B Determine the elevation of B

Q: Based from the Figure 4.2, a vertical angle of +13°45' is read to a target 1.23 m above point B. The…

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Q: In a vertical photograph taken from an altitude of 2800 m, a chimney of height 100 m, appears at a…

A: Altitude (H): 2800 mChimney height (h): 100 mDistance of chimney image from principal point (r): 80…

Q: Readings on a line of differential levels are taken to the nearest 2 mm. For what maximum distance…

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Q: Readings on a line of differential levels are taken to the nearest 0.2 mm. For what maximum distance…

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Q: Point P is between points Q and R. The distances of Q and R from point P are 1000 m and 2000 m,…

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Q: Find the deflection angle from the following observation AB=N42°20' E BC=N 30°00'E * O 12° 20'L 12°…

A: Given Data:  Bearing of Line AB N 42o20'E Bearing of Line BC N 30o00'E

Q: Point A is between points B and C. The distances of B and C from point A are 1000 m and 2000 m,…

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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.