Geodetic or trigonometrically surveying takes into account the curvature of earth Since very extensive areas and very large distances are involved. In geodetic surveying highly refined instruments and methods are used. Geodetic work is undertaken by the state agency e.g. survey of Pakistan undertaken by the state agency. The object of geodetic surveying is to

A photo theodolite is a form of ground camera. It is a combination of camera and theodolite ans is used of taking photographic and measuring the angles which the rival plane of collimation makes with base line. The optical axis of the camera is arrange parallel to the line of collimation of the chocolate telescope and the theologize allows The determination of the orientation

Because of the development of highly accurate electronic measuring devices, a triangulation system can be completely observed, computed and adjusted by measuring the lengths o the sides in the network.

The establishment of accurately located control points for surveys of large. The accurate location of indirection work such as: Centre lines, terminal pts shafts for long tunnels

Triangulation system may be classified according to Degree of accuracy required Magnitude of work