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In Civil Engineering , surveying  plays a very important role. It used in all types of Civil Engineering  projects such as roads, railways, sewers, housing schemes, and buildings.            Introduction to Survey Surveying:-                         Surveying is the science of determining the relative positions of points, above  or beneath the surface of the earth by means of direct and indirect measurements of distance direction, and elevation. Purposes of Survey:-     To prepare a map of the earth above or below sea level.      To establish boundaries of private and public lands.     Measure area and land with the help of survey.     To prepare uo to date plane of the area .     To mark suitable site or route for any building. Principle  of surveying:- There are two fundamental principle of surveying To work from whole to the part . To locate posiion of the new station.  Method of surveying:- Following method are used for survey:- 1) Traversing 2) Triangulation 3) Trilateration  S