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In plane table surveying the method in which the rays are drawn from station No. 1 towards objects then the plane table is shifted to second station, again from station No. 2 the rays are drawn towards the same objects then the cutting point represents the respective objects on map. This method is known as:-
1. Orientation method
2. Intersection method
3. Resection method
4. Radiation method

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Correct Answer - Option 2 : Intersection method

Explanation:

Plane table surveying is the graphical method of surveying in which field observation and plotting are done simultaneously helping the surveyor to compare the plotted details with actual features of the ground. Method of plane table surveying are,

  • Radiation is the method of locating the point by drawing radial lines from the plane table station to that point.
  • The intersection is a method of locating a point by the intersection of two rays from two different stations.
    • The intersection is one of the methods of plane table surveying which is used for plotting the positions of objects on the drawings. In this method, the plane table is shifted to a known distance in a particular direction marked on the ground and the line of sights is drawn to make an intersection of the radial lines already drawn from the first set up of the instrument.

      ∴ This method is preferred when the distance between the stations is too large or the grounds are undulating. Example: Hilly areas or Hillock without vegetation.
  • Resection is the method of locating the station occupied by the plane table when the position of that station had not been previously plotted from other station.
  • Traversing is that type of survey in which a number of connected survey lines form the framework.

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