USE OF TRIANGULATION
Triangulation survey is conducted for one or more of following purposes:
- For establishing accurate ground control points for photogrammetric survey of large area.
- For determining the size and shape of earth by making observations for latitude, longitudinal gravity etc.
- To establish accurate horizontal control of various engineering projects.
Steps followed in Triangulation
Field work
- Reconnaissance
- Establishment and preparation of triangulation stations
- Measurement of base line and check base
- Measurement of horizontal angles
Office work
- Specifications of stations and signals
- Necessary adjustments in observations
- Computations of lengths of sides
- Computations of bearings, latitudes and departures
- Computation of independent co-ordinates
TRIANGULATION SYSTEM
- A system consisting of triangulation stations connected by a chain of triangles is called as triangulation system or triangulation figure.
- Most commonly used figures in triangulation system are:
(a) Triangles (b) Quadrilaterals (c) Polygons
All these triangulation figures must satisfy the required geometrical conditions.
- But it is not possible to satisfy all the geometrical conditions due to errors involved in observations and calculations until the field measurements have been adjusted.
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