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What are Survey Stations and How to Select a Survey Station

By: Haseeb Jamal / On: Apr 24, 2017 / Definition, How To, Factors Affecting
 
 

Definition

Survey Stations is a point of importance at the beginning and end of chain line. There are two types of survey stations:

Main Station

  • These are the end of survey line i.e. which connects boundaries.
  • Line joining Main Stations is called Main Survey Line or Chain Line.
  • They are represented by Circle, Capital letters A B... Or number 1 2... Or (A)

Subsidiary or Tie Station

  • These are the points selected on main line, where it is necessary to run auxiliary lines to locate interior details such as corner, tree, building etc.
  • Lines joining tie station are called Tie Lines or Subsidiary Lines
  • They are represented by Small letters a, b,
Surveying Stations

Selection of Survey Station

The following points should be kept in mind while selecting a station:

  • The stations should be mutually intervisible
  • Main principle of chain survey should strictly be observed
  • If possible, line through the whole length of area should be drawn
  • All triangles should be well defined
  • A check line should be provided in each triangle
  • Survey lines should be as few as possible
  • A number of tie lines should be drawn
  • Position of survey lines should be such that to avoid obstacles to chaining and ranging
  • It should be on level ground
  • The sides of triangle should pass as close to the boundary as possible.

Important Lines

  1. Base line
  2. Check line
  3. Tie line

Base Line

  • The longest of the chain lines used in making a survey is generally regarded as Base line.
  • It is the most important line because it fixes up the direction of all other lines, since on base line, is built framework of a survey.
  • It should be laid on level ground, as possible through the center and length of the area.
  • It should be correctly measured and should be measured twice or thrice.

Check Line

  • A check line also called proof line is a line joining the apex of a triangle to some fixed point on the opposite side.
  • A check line is measured to check the accuracy of the framework.
  • Thus there is a complete check on the field measurement as well as on the accuracy of the plotting work.

Tie Line

  • A tie line is a line joining fixed points termed as Tie station on the main survey lines.
  • A tie line usually fulfill a dual purpose i.e. it checks the accuracy of the framework and enables the surveyor to locate the interior details which are far away from the main chain line
 

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