9. In an old survey performed in 1965, a line AB had a magnetic bearing of S 75°10' W when the magnetic declination was 4°30' west. In a new survey performed in 1987 the declination in the same locality changed to 2°50' east. What shoild be the magnetic bearing in of AB in 1987? 10. If azimuth from the North of line DE is 219°02', what is the azimuth of DE from the South? 11. The azimuth from north of traverse line AB is 225°00'. If the succeeding line BC has a bearing of S 30°00' E, what is the deflection angle at station B?

Q: the bearing of line in 1975 was found to be N 19°09`W. in 2003, it was found out that at the said…

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Q: . In an old survey made when the declination was 2010'W, the magnetic bearing of a given line was…

A:

Q: An open traverse PQRST is surveyed using a theodolite and the consecutive coordinates obtained are…

A: Given data- An open traverse PQRST given, Northing, Southing, Easting & Westing values are given…

Q: In an old survey performed in 1965, a line AB had a magnetic bearing of S75deg10’W when the magnetic…

A: Given Data:Magnetic Bearing = S75°10'WMagnetic declination = 4°30'Change in Magnetic declination =…

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.