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  Definition of survey  Surveying is the art by which we determine the relative positions of different permanent objects on the surface/ under the surface of the earth or in the sky by taking the horizontal or vertical and angular measurements and to prepare a map to any suitable scale of surveyed area.  Principles of surveying... Following are the two basic principles of surveying. 1- To locate a new point by two reference point 2- To work from whole to part  (1) - Location of a point by measurement from two point of reference.   The relative position of the point to be surveyed should be located by measurement from at least two point of reference, the position of which have already been fixed  (2)- To work from whole to part   The second principle of surveying, whether plane or geodetic ,is to work from whole to part .It is very essential to establish first a system of control points and to fix them with higher precision.Minor control points can the...