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  1. Inaccessible point can be easily located by intersection.
  2. Irregular areas and objects can be well represented.
  3. It is suitable in magnetic areas.
  4. Number of accessories required are small.
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Option 4 : Number of accessories required are small.

Explanation:

Plane tabling is a graphical method of surveying in which the field surveying and plotting proceed simultaneously.

Instruments used in plane table survey are as follows:

  1. The plane table with levelling head having arrangements.
  2. Alidade for sighting.
  3. Plumbing fork and plumb bob.
  4. Spirit level.
  5. Compass.
  6. Drawing paper with a rainproof cover.

Advantages of plane tabling:

  • The plan is drawn by the out-door surveyor himself while the country is before his eyes, and therefore, there is no possibility of omitting the necessary measurements.
  • The surveyor can compare plotted work with the actual features of the area.
  • Since the area is in view, contour and irregular objects may be represented accurately.
  • Direct measurements may be almost entirely dispensed with, as the linear and angular dimensions are both to be obtained by graphical means.
  • Notes of measurements are seldom required and the possibility of mistakes in booking is eliminated.
  • It is particularly useful in magnetic areas where compass may not be used.
  • It is simple and hence cheaper than the theodolite or any other type of survey.
  • It is most suitable for small scale maps.
  • No great skill is required to produce a satisfactory map and the work may be entrusted to a subordinate.

Disadvantages of plane tabling:

  • Since notes of measurements are not recorded, it is a great inconvenience if the map is required to be reproduced to some different scale.
  • The plane tabling is not intended for very accurate work.
  • It is essentially a tropical instrument.
  • It is most inconvenient in rainy season and is wet climate.
  • Due to heaviness, it is inconvenient to transport,
  • Since there are so many accessories, there is every likelihood of these being lost.
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Related Questions

In the question below are given four statements followed by four conclusions numbered I, II, III and IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: All Bad are Cart. No Cart is Yard. No Yard is Seat. Some Seat are Table. Conclusions:                                                                                        I. Some Table will not be Yard.                                                 II. All Table are Yard.                             III. No Bad is Yard.                                                                                 IV. Some Bad are Seat. ?
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