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Compass surveying - Problem-1
Unit 1- Surveying
Compass surveyingProblems
1. Determine the values of included angles in the closed compass traverse ABCD, conducted in clock wise direction, given the following fore bearings of their respective lines.
Line Fore bearing
AB 40º
BC 70º
CD 210º
DA 280º
Included angle = Back bearing of the previous line - Fore bearing of the next line
A = B.B line AD – F.B of line AB= (280º -180º) - 40º = 60º
B = B.B of line AB – F.B of line BC= (40º + 180º) – 70 º = 150º
C = B.B of line BC – F.B of line CD (70º + 180º )-120º = 40º
D = B.B of the line CD – F.B of line DA = (210º – 180) -280 + 360º = 110º
Check : (2n -4) * 90º = (2 x 4 - 4) x 90º =360º
A+B+C+D+E = 60º + 150º + 40º + 110º = 360º
Last modified: Thursday, 12 May 2011, 5:23 AM