The method of measuring the chain angle of a framework of a triangle being formed by making the station on the surface of earth is called triangulation.
A chain of triangles is very rapid and economical if one surveys a narrow strip of terrain.
In triangulation systems that angle less than 30 degree or more than 120 degree they are treated as ill-conditioned triangles and so it is not to be taken in survey work.
One treats angles more than 30 degree or less than 120 degree as well-conditioned and so one should consider and take it in surveying work.
Uses:
- Firstly object of triangulation is to find the size and shape of the earth surface by performing the various observations for latitude, longitude and gravity.
- One uses it to fix the center line, terminal points and shafts for long tunnels.
- It is forms a network or a framework.
- The cadastral, hydrographical, engineering survey, topographical survey and also therefore other surveys are based on triangulation.
- It provides the most accurate and precise system of horizontal control.
- The system provides the desired checks on the computations and therefore One can select usually better triangles.
- One uses it to fix the center line of abutments for long bridges over large rivers is lastly.
Application:
- Firstly for plane and geodetic survey of large areas, One can use triangulation to establish more accurately located control points.
- Therefore it provides an accurate location of various engineering projects like center lines, terminal points and shafts for long tunnels, center lines and abutments for bridges of longer span.
- Triangulation used to establish accurately located control points in aerial surveying
- Lastly one uses Triangulation method widely for survey of larger areas like survey of nation, survey of state etc.
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