For a first-order geodetic control network established by traverse, the position closure after azimuth adjustment should be at least as good as which ratio?

For a first-order geodetic control network established by traverse, the position closure after azimuth adjustment should be at least as good as which ratio?

• A. 1:100,000
• B. 1:50,000
• C. 1:20,000
• D. 1:10,000

Answer: (A)

In a traverse-based first-order geodetic control network, the key accuracy criterion is the quality of the position closure after adjusting the azimuths. This closure is the remaining misclosure when you complete the loop, expressed as how close the final position is to the starting point after corrections. For first-order networks, the standard is that this misclosure should be no worse than one part in 100,000 of the total span of the network. Expressed differently, the position closure distance should be less than the total length divided by 100,000. This stringent requirement keeps errors from angular and distance measurements from accumulating beyond a very small fraction, ensuring high geometric integrity of the network. The other ratios are looser standards and would allow larger residuals, which is why the 1:100,000 criterion is the appropriate benchmark for first-order networks.

In a traverse-based first-order geodetic control network, the key accuracy criterion is the quality of the position closure after adjusting the azimuths. This closure is the remaining misclosure when you complete the loop, expressed as how close the final position is to the starting point after corrections. For first-order networks, the standard is that this misclosure should be no worse than one part in 100,000 of the total span of the network. Expressed differently, the position closure distance should be less than the total length divided by 100,000. This stringent requirement keeps errors from angular and distance measurements from accumulating beyond a very small fraction, ensuring high geometric integrity of the network. The other ratios are looser standards and would allow larger residuals, which is why the 1:100,000 criterion is the appropriate benchmark for first-order networks.