Level and Levelling

Elevation measurements involve measurements in vertical plane. It is also known as levelling. It may be defined as the art of determining the elevations of given points above or below a datum line or establishing given points of required heights above or below the datum line.

—–15.1 Object and Uses of Levelling
—–15.2 Terms Used in Levelling
—–15.3 Levelling Instruments
—–15.4 Levelling Staff
—–15.5 Methods of Levelling
—–15.6 Terms Used in Direct Method of Levelling
—–15.7 Temporary Adjustments of a Level
—–15.8 Types of Direct Levelling