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Compass surveying

 Compass surveying is a type of land surveying that uses a magnetic compass to measure angles between points on the surface of the earth. It is also known as bearing surveying or traverse surveying.

In compass surveying, a magnetic compass is used to determine the magnetic bearing of a line between two points. The magnetic bearing is then converted to a true bearing, taking into account the local magnetic declination, which is the angle between magnetic north and true north.

The surveyor takes a series of bearings between points on the ground to determine the direction of the lines connecting the points. These lines are called survey lines or traverse lines. The surveyor then uses the bearings and distances between the points to calculate the location of each point relative to the starting point of the survey.

Compass surveying is typically used to survey large areas of land where the precise location of points is not as critical as their relative positions to each other. It is also used to establish control points for more precise surveys, such as topographical surveys or boundary surveys.

Compass surveying has several advantages over other types of surveying, including that it is relatively fast and inexpensive, does not require a clear line of sight between points, and is not as affected by changes in weather or atmospheric conditions as other surveying methods. However, it is subject to errors due to magnetic interference and the need to accurately determine the magnetic declination.

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