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In a compass survey work of an open traverse ABCDE shown in the figure, the bearing of the first line AB observed was not clearly written in the field. The observed bearing of the last line DE was recorded as S36°40’E. If the deflection angles are 31°50' (right) at D, 42°30' (right) at C, and 18°20' (left) at B. calculate the bearing of the first line AB.

In a compass survey work of an open traverse ABCDE shown in the figure, the bearing of the first line AB observed was not clearly written in the field. The observed bearing of the last line DE was recorded as S36°40’E. If the deflection angles are 31°50' (right) at D, 42°30' (right) at C, and 18°20' (left) at B. calculate the bearing of the first line AB. Correct Answer N 87°20'E

Concept:

Compass Survey:

  • The angle of two lines would be derived by using a magnetic meridian reference line(magnetic bearing of a line).
  • Surveying done by a magnetic bearing compass instrument using a traverse method of calculation is known as compass surveying.

Open traverse:

  • A surveying traverse fails to terminate where it began and therefore does not completely enclose a polygon.

Calculation:

According to the given diagram:

[ alt="F1 Akhil 05-01-22 Savita D1" src="//storage.googleapis.com/tb-img/production/22/01/F1__Akhil_05-01-22_Savita_D1.png" style="width: 389px; height: 227px;">

 

The angle of line AB from south = (68o30' + 42o30') - 18o20' = 92o40'

Bearing of line AB = 180 - 92o40' = 87o20'

Bearing of line AB is N 87o20' E

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