A stadia measurement was undertaken with a theodolite having an internal focusing telescope and stadia interval factor of 98.8. When a backsight was taken on a turning point whose elevation is 205.62 m, the rod interval observed was 1.94 m; and with the horizontal hairs set at 1.50m on the rod, the vertical angle reading was -13°45'. For a foresight to a control point, the rod intercept was 1.17 m, and with the horizontal hairreading of 1.60 m on the rod, the vertical angle observed was +7°18'. Determine the elevation of the line of sight at the instrument point and the elevation of the point on which the foresight was taken (Control Point)

A stadia measurement was undertaken with a theodolite having an internal focusing telescope and stadia interval factor of 98.8. When a backsight was taken on a turning point whose elevation is 205.62 m, the rod interval observed was 1.94 m; and with the horizontal hairs set at 1.50m on the rod, the vertical angle reading was -13°45'. For a foresight to a control point, the rod intercept was 1.17 m, and with the horizontal hairreading of 1.60 m on the rod, the vertical angle observed was +7°18'. Determine the elevation of the line of sight at the instrument point and the elevation of the point on which the foresight was taken (Control Point)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

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.

Question

A stadia measurement was undertaken with a theodolite having an internal focusing telescope and stadia interval
factor of 98.8. When a backsight was taken on a turning point whose elevation is 205.62 m, the rod interval
observed was 1.94 m; and with the horizontal hairs set at 1.50m on the rod, the vertical angle reading was -13°45'.
For a foresight to a control point, the rod intercept was 1.17 m, and with the horizontal hairreading of 1.60 m on the
rod, the vertical angle observed was +7°18'. Determine the elevation of the line of sight at the instrument point and
the elevation of the point on which the foresight was taken (Control Point)

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