Plane Table Surveying

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Plane Table Surveying

• Prepared by https//civilenggascent.com

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Instruments forplane table surveying

• - Plane Table - Trough Compass
• - Spirit Level - Erasers
• - Mechanical pencils - Drawing Sheets
• - Alidade - u-Frame or Plumbing fork

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Principle of Plane Table Surveying

• Parallelism is the principle of plane table
  surveying.
• As in plane table surveying all the rays on
  drawing sheet are drawn parallel to the sight
  line in the alidade, parallelism is the principle
  of Plane Table Surveying.

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Benefits of Plane Table Surveying

• As drawings are drawn at the ground, no necessity
  to maintain field book.
• Easy and quick to prepare drawings for small
  work.
• No great skill is required.
• It is less costly as compared with theodolite
  survey.
• The error and mistakes in plotting can be checked
  by drawing the check lines.

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Disadvantages of Plane Table Surveying

• Plane table is heavy and awkward to carry, and
  the accessories are likely to be lost.
• It is not suitable for work in a wet climate and
  in a densely wooded country.
• It is unsuitable for large area surveys because
  it requires frequent changes in the size of
  drawing sheets.
• It does not give very accurate results.

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Methods of Plane Table Surveying

• Radiation Method of Plane Table Surveying
• Intersection Method of Plane Table Surveying
• The Three point problem in Plane Table Surveying
• The Two point problem in plane Table Surveying

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Errors in Plane Table Surveying

• Observation Errors These are the errors in
  inappropriate reading
• Human Errors False entry in survey book is a
  type of human errors. It is compensating error.
• Instrumental Errors Misalignments of Plane
  Table, rough edge of alidade, or any other errors
  in instruments.
• Natural Errors Environmental factors such as
  refraction, wind etc. These errors are cumulative
  in nature.

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