What is reciprocal levelling?
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Reciprocal levelling is a survey technique used for determining differences in elevation between two points or to measure absolute distances. It involves a series of observations taken in both directions, allowing the differences between the two stations to be determined. It relies on using a level, measuring rod, and a staff (measuring tape) to measure the distance from one point to the other, and then reversing the process to measure the same distance in reverse.
The difference in the two distances is then used to calculate the difference in elevation. Reciprocal levelling is an important part of Survey engineering and can be used to map out large areas accurately.