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CoGripedia your encyclopedia of terms used in the industrial flooring industry.

Fore Sight


In levelling, a fore sight is taken immediately before the optical level is moved to a new location.

Technical Information

After all grid points within range of the optical level have been measured, it is necessary to move the optical level to a new location.

There is a chance that, in its new location, the optical level will be higher or lower than it was in its old location. 

Therefore, it is necessary to:

  1. Take a measurement (fore sight) from a point before the optical level is moved.
  2. Take a measurement (back sight) from the same point once the optical level is set up in its new position.
  3. Calculate the difference in elevation between the old and new location of the optical level.

Related Definitions


  1. California Department for Transportation: Surveys Manual; Chapter 8 


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