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Back Sight: – Backsight is the first reading of a staff (levelling rod) which remains unchanged when the levelling apparatus is taken to another or new point after the levelling instrument is set up and levelled on the first point. And simply it can be defined as the backward reading of the previous station point. It is taken on the known reduced level or benchmark.
Fore Sight:- Foresight is the reading of the staff or levelling rod which is taken in the forward direction of the levelling process or the staff reading which is to be determined and it is a last reading of the whole surveying process. It is considered as negative and deducted from Height of Instrument to determine RL of the point.
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