Computer · Surveying
The fore bearings (FB) and back bearings (BB) for a closed traverse ABCD are given below: Line FB BB AB 76° 30' 259° 10' BC 110° 00' 289° 30' CD 227° 00' 47° 00' DA 309° 00' 130° 00' Among the stations A, B, C, and D, identify the stations affected by local attraction and find the corrected FB of the line AB.
- 1Local attraction: C and D; FB of AB: 77° 30'
- 2Local attraction: A and B; FB of AB: 77° 30'
- 3Local attraction: A and B; FB of AB: 75° 30'✓
- 4Local attraction: C and D; FB of AB: 75° 30'
Correct answer
Local attraction: A and B; FB of AB: 75° 30'
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