What is Plane Table Surveying? Setup & Methods. It is best fitted for small-scale surveying i.e. any types of fields. It is also used in surveying industrial areas where compass survey fails to perform. It is often used to fill in details between stations fixed by triangulation method or theodolite traversing method. In case of plane table survey, the measurements of survey lines of the traverse Orientation by magnetic needle: In this method, the magnetic north is drawn. This is the easiest method in plane tabling. It is used when: All the details are visible and accessible from one instrument station The ground is level and smooth.
|Published:||19 October 2015|
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Significance and Applications This is the easiest method in plane tabling. It is used when: It is best fitted for small-scale surveying i. Temporary Adjustments of The Plane Table 1.
Centering Plane table surveying procedure process is to ascertain that the point on the ground is represented accurately on the paper. It is carried out with the help of plumbing fork and plumbing bob. The pointed end at the upper hand of the plumbing fork is kept on paper and at the other end, a plumb bob is fixed.
What is Plane Table Surveying? Setup & Methods - Civil Engineering
The board is shifted manually until the bob hangs exactly over the peg of the station. This work can be tiresome but a prerequisite for any further activities.
Leveling Leveling is done so that the plane table surveying procedure board remains parallel to the ground. It is done in the following three methods: Orientation The process by which the position occupied by the board at various survey stations are kept parallel is known as the orientation.
In the plane table surveying, the whole table needs to be moved at several stations to complete a survey. Every time the table is moved one has to make sure that the new station is parallel to the previous one otherwise the lines drawn on paper will not represent the same lines on plane table surveying procedure field.
Methods of orientation are: This method is used when it is not possible to bisect the previous station from the new station. This method is not much reliable and prone plane table surveying procedure errors due to variations of the magnetic field.
Plane Table Surveying | Its Methods, Advantages & Disadvantages, etc.
Orientation by Back Sighting: This is a more reliable method. In this method, a particular line drawn from the previous station is drawn again from the new station.
Plane table surveying procedure level tube or circular level is placed on the table first parallel to two screws and then over the third screw. If the leveling or the ball-and-socket arrangement is not provided, the leveling may plane table surveying procedure completed by simply adjusting the legs.
Orientation may be defined as the operation keeping the table at each of the successive stations parallel to the position occupied by the table at the first station.
Thus, all the lines on the paper will be parallel to the corresponding lines on the ground if the table is oriented. This operation becomes necessary in case of more than one instrument stations.
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