Plane table surveying is a type of land surveying that uses a plane table, alidade, and sight rod to determine the locations of points on the surface of the earth. It is a graphical method of surveying and is typically used for smaller scale projects where a quick and efficient survey is needed.
In plane table surveying, the surveyor sets up the plane table, which is a flat board mounted on a tripod, at a known location on the ground. The surveyor then uses an alidade, which is a sighting device, and a sight rod, which is a rod or staff used as a target, to determine the location of points relative to the plane table.
The surveyor takes a series of sightings from the plane table to points on the ground and draws a sketch of the points and the lines connecting them on the plane table. The surveyor then uses the sketch to determine the locations of the points relative to each other and to the plane table.
Plane table surveying has several advantages over other types of surveying, including that it is relatively fast, efficient, and inexpensive, and can be performed in areas where it is difficult to set up more complex surveying equipment. However, plane table surveying is limited by the accuracy of the sketch and the skill of the surveyor, and it is subject to errors due to changes in weather and atmospheric conditions.
Plane table surveying is still used today, especially in areas where a quick and efficient survey is needed, but it has been largely replaced by more advanced surveying methods, such as total stations and GPS surveying.
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