How Surveyors Compute Interior Angles?

This video teaches how to create a traverse and calculate its interior angles from bearings. The angles can be determined by observing the bearings of two lines from their point of convergence. When the two lines meet at a point, two angles (interior and exterior) are formed. To calculate the interior angles, draw a rough sketch of the scheme based on corrected bearings.

To calculate the back azimuth, start by writing down the starting azimuth. Add 180° to obtain the back azimuth, and subtract the interior angle to obtain the azimuth of the next line. To find the angle between two azimuths, subtract the smaller one from the larger one.

The video also discusses the calculation of interior angles from the bearing of the lines in surveying. Methods for expressing the magnitude of plane angles include sexagesimal, centesimal, radians, and milliradians. Measurements can be conducted based on distances only, using tape or EDM to obtain a map of a surveyed area or establish BP.

In the interior angle adjustment method, the algebraic sum of the interior angles is computed, which needs to be (2n – 4) X 90°, where n is the number of sides in the polygon. The included angle between two lines is the difference of bearings of two lines, which can be either an interior or exterior angle.