What is triangulation and trilateration?

Triangulation is process of measuring bearings and calculating distances (using the Sine Rule). Trilateration is the process of measuring distances and calculating bearings (using the Cosine Rule).

What is triangulation in land surveying?

In surveying, triangulation is the process of determining the location of a point by measuring only angles to it from known points at either end of a fixed baseline, rather than measuring distances to the point directly as in trilateration.

What is trilateration method in surveying?

Trilateration, method of surveying in which the lengths of the sides of a triangle are measured, usually by electronic means, and, from this information, angles are computed. Except that only lines are measured, while all angles are computed, the field procedures for trilateration are like those for triangulation.

What are the steps in triangulation survey?

Triangulation work is carried out in following step.

1. Reconnaissance.
2. Erection of Signals & Towers.
3. Measurement of Horizontal Angles.
4. Astronomical Observations Necessary to Determine the True Meridian and the Absolute Positions of the Stations.
5. Measurement of Baseline.

What is triangulation principle?

Triangulation. Triangulation is a surveying method that measures the angles in a triangle formed by three survey control points. Using trigonometry and the measured length of just one side, the other distances in the triangle are calculated.

What is triangulation used for?

Abstract. Triangulation is a technique to analyze results of the same study using different methods of data collection. It is used for three main purposes: to enhance validity, to create a more in-depth picture of a research problem, and to interrogate different ways of understanding a research problem.

What is the purpose of triangulation in surveying?

The main objective of triangulation or trilateration surveys is to provide a number of stations whose relative and absolute positions, horizontal as well as vertical, are accurately established. More detailed location or engineering survey are then carried out from these stations.

What are the types of triangulation in surveying?

Methodological Triangulation.

• Researcher triangulation.
• Data Triangulation.
• Theoretical triangulation.
• Environmental Triangulation.

What are the four types of triangulation?

In 1978, Norman Denzin identified four basic types of triangulation: (1) data triangulation: the use of multiple data sources in a single study; (2) investigator triangulation: the use of multiple investigators/research- ers to study a particular phenomenon; (3) theory triangulation: the use of multiple perspectives to …

How is triangulation used in surveying a triangle?

Triangulation is a surveying method that measures the angles in a triangle formed by three survey control points. Using trigonometry and the measured length of just one side, the other distances in the triangle are calculated.

What’s the difference between triangulation and trilateration in GPS?

Before EDMs, triangulation was favored as it was very hard to measure long distances accurately while it was comparatively easy to measure angles. With the advent of electronic distance measurement tools (total stations and their ilk), trilateration also became popular as it was no longer hard to measure distances.

What’s the difference between triangulation and distance measuring?

Triangulation Measures Angles, Not Distance. On the other hand, surveyors use triangulation to measure unknown distances. They do this by establishing a baseline length. From each point, surveyors measure angles of distant points use instruments such as theodolites.

What’s the difference between trilateration and total station surveys?

Disclaimer: Images are from the ICSM site. Trilateration = working with distances. In real world applications you often work with both, or combine them. For example, total station surveys measure both distances and angles.