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KINDS OF SURVEYS
- 6 страниц
- 2017 год
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KINDS OF SURVEYS
The purpose of surveying is to locate the positions of points on or near the Earth's sur¬face. Some surveys involve distance and angle measurements for the following reasons:
1) to determine the horizontal position of arbitrary points on the surface;
2) to determine the elevation of arbitrary points above or below the surface;
3) to determine the configuration of the ground;
4) to determine the direction of the lines;
5) to determine the length of the lines;
6) to determine the position of boundary lines and...
7) to determine the area of tracts bounded by these lines.
Such measurements are data gathering ones.
In other surveys it is required to lay off distances and angles for locating construction lines for buildings, bridges, highways and other engineering constitutions and to establish the position of boundary lines on the ground. They would be layout measurements.
A survey made to establish the horizontal or vertical position of arbitrary points is re¬ferred to as control survey.
If you are to determine the length and direction of boundary lines or and the area bounded by these lines it is termed a cadastral-, land-, boundary- or property survey. The cadastral survey is also when we must establish the position of boundary lines on the ground.
A topographic survey is to represent the configuration of the ground surface.
To determine the configuration of a water body we make a hydrographic survey.
Surveys performed to locate or lay out engineering works are called construction surveys.
All types of surveys involve some computations which may be made right on the spot, in the office or in both places.
Some kinds of surveys require very few computations, others involve lengthy and tedious ones. Hence those who study surveying are to be familiar both with field operation techniques and mathematical ones applied thereby.
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