Basic principle of surveying........

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The  following two basic principles should be considered while determining relative position of points on the surface of earth:-
1. determining suitable method for locating a point:- it is  always practicable to select two points in the field to measure the distance between them. These can be represented on paper by two points placed in a convenient positions.
2.working from whole to the part:- in surveying an area, it is essential to establish first of all a system of control points with great precision. Minor control points can then be established by less precise method and the details can be located  afterwards by method of triangulation or traversing between control points. 
Know the basic and you will never need to know again and again.

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