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Surveying is one of the most important aspect of civil engineering. It involves the assessment of site and recording details about land. Measurement of angles, vertical and horizontal distance between points all these data help us to plan construction projects. The main principle of surveying is working from whole to part i.e., It is very essential to establish first a system of control points and to fix them with higher precision. Minor control points can then be established by less precise methods and the details can then be located using these minor control points by running minor traverses etc . It is for the prevention the accumulation of errors and to control and localize minor errors. Surveying is a method to determine relative position between two points on, above or beneath the earth surface and it also includes the art of establishing by predetermined angular and linear measurements. Levelling is a branch of surveying in which elevations of points are ...