Computer · Surveying and Trigonometrical Levelling
When two instrument stations P and R are in the same vertical plane as an elevated target point Q, instrument axes are at the same level, instrument distance is b, horizontal distance from P to the object is D, and elevation angles are α1 and α2 (α1 > α2), what is the formula for the Reduced Level (R.L.) of point Q?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1R.L. of B.M. + S + b × cos(α1) × cos(α2)cos(α1 - α2)
- 2R.L. of B.M. - S + b × sin(α1) × sin(α2)sin(α1 - α2)
- 3R.L. of B.M. + S + b × sin(α1) × sin(α2)sin(α1 - α2)✓
- 4R.L. of B.M. + S - b × cos(α1) × cos(α2)cos(α1 - α2)
Correct answer
R.L. of B.M. + S + b × sin(α1) × sin(α2)sin(α1 - α2)
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