Tacheometry

A prismatic compass is a navigation and surveying instrument which is extensively used to find out the bearing of the traversing and included angles between them, waypoints (an endpoint of the course) and direction. Compass surveying is a type of surveying in which the directions of surveying lines are determined with a magnetic compass, and the length of the surveying lines are measured with a tape or chain. The compass is generally used to run a traverse line. The compass calculates bearings of lines with respect to Magnetic North. The included angles can then be calculated using suitable formulas in case of clockwise and anti-clockwise traverse respectively. For each survey line in the traverse, surveyors take two bearings that are fore bearing and back bearing which should exactly differ by 180° if the local attraction is negligible. The name Prismatic compass is given to it because it essentially consists of a prism which is used for taking observations more accurately.

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Important terminology - Bearing band its system

Intro & Important Terminology Bearing (in Hindi)

Course Overview (in Hindi)

(True ,Magnetic) Bearing & Meredian (in Hindi)

Magnetic Declination & types & Angle of dip (in Hindi)

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Intro & Important Terminology Bearing (in Hindi)

Dhananjay Pandya

(Hindi) Compass Surveying : GATE(CE)

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