Triangulation In Surveying

Triangulation Meaning

Triangulation is a survey technique in which points are located by measuring only angles. Angles are measured from known points at both end of a defined baseline using trigonometry. As the third point of a triangle with a known side and two known angles, the point can then be determined.

Description

It is not much difficult to set sup points on plane land. But it is difficult to set up point in hilly areas. Triangulation is chosen for areas with hills and undulations. Sometimes triangulation work can face errors in line, lengths and directions because both depend on computations for those of the preceding line, which requires the use of check bases.

In triangulation, a framework of triangles is used to cover the entire region to be surveyed. The first line’s precise length for the triangle is referred to as the base line.

For two more triangles connected to the original triangle, the other two computed sides serve as new baselines. A chain or network of triangles can be distributed throughout the entire region by continuing this method.

Triangulation work in the field completed in 4 steps. These 4 steps are Reconnaissance, Station preparation, Baseline measurement and angle measurement.

Pros

• Accurate measurements are provided through triangulation across greater distances.
• Cheap and simple to use.
• Triangulation observations don’t need any specialized equipment or setting up.
• In order to measure larger distances, triangulation is used.

Cons

• To explain the measurements, more details are required. Applying triangulation to several small surfaces or areas is challenging. Triangulation demands a certain set of skills and expertise.
• To make accurate measurements using triangulation, you need to have a deep understanding of surveying.
• It takes more time and effort to gather measurements from various places.

Uses

• It allows for the exact placement of control points for large-scale geodetic and planar surveys.
• The construction of correctly positioned checkpoints is necessary for aerial surveys. Precise placement of engineering projects such long bridge centerlines, abutments, endpoints, and chambers.