Any one can please explain what is back sight in surveying?
What is back sight in surveying?
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The leveling staff held at a point of known elevation and the staff reading taken on a point of known elevation, is called back sight. Back sight is the first staff reading after the staff instrument is set up, It is also known as +ve sight.
Back sight in surveying is the process of measuring the elevation of a point from a known reference point. This reference point is typically a bench mark, which is a surveyed point already known to have a certain elevation.
The measured elevation of the point is referred to as the back sight elevation and can be used to calculate the elevation of the other points.