In a classical triangulation, the procedure for second order, class II accuracy positioning requires which of the following directions?

In a classical triangulation, the procedure for second order, class II accuracy positioning requires which of the following directions?

• A. 2
• B. 8
• C. 8 or 12
• D. 4

Answer: (C)

In triangulation, achieving the requested accuracy for positioning relies on redundancy: many independent directional measurements around a station allow the least-squares adjustment to separate random errors from true geometry and to check for biases. For second-order, class II positioning, the standard practice is to observe a substantial number of directions so the network around the station is well conditioned. Eight directions provide the baseline redundancy needed for reliable results, and twelve directions offer even greater robustness, better error checks, and more even angular coverage. Why not fewer? With only a small dozen of directions, the solution would be more sensitive to instrument biases and local errors, and the adjustment would have less redundancy to distribute and dampen errors. The eight-to-twelve range strikes a balance between practicality and achieving the required precision.

In triangulation, achieving the requested accuracy for positioning relies on redundancy: many independent directional measurements around a station allow the least-squares adjustment to separate random errors from true geometry and to check for biases. For second-order, class II positioning, the standard practice is to observe a substantial number of directions so the network around the station is well conditioned. Eight directions provide the baseline redundancy needed for reliable results, and twelve directions offer even greater robustness, better error checks, and more even angular coverage.

Why not fewer? With only a small dozen of directions, the solution would be more sensitive to instrument biases and local errors, and the adjustment would have less redundancy to distribute and dampen errors. The eight-to-twelve range strikes a balance between practicality and achieving the required precision.