In first-order geodetic control, the average triangle closure should not exceed how many arcseconds?

In first-order geodetic control, the average triangle closure should not exceed how many arcseconds?

• A. 1.0 arcseconds
• B. 3 arcseconds
• C. 5 arcseconds
• D. 10 arcseconds

Answer: (A)

In first-order geodetic control, triangle closure is a measure of how well the measured lines around a closed triangle add up to zero, reflecting the internal consistency of the network. The average triangle closure is kept very small to ensure that accumulated measurement errors don’t distort the network coordinates. The standard target is about one arcsecond of average closure, which provides a strict but achievable balance between measurement precision and network integrity. If the average closure were larger, such as a few arcseconds or more, it would indicate looser precision and could lead to less reliable positions in the network.

In first-order geodetic control, triangle closure is a measure of how well the measured lines around a closed triangle add up to zero, reflecting the internal consistency of the network. The average triangle closure is kept very small to ensure that accumulated measurement errors don’t distort the network coordinates. The standard target is about one arcsecond of average closure, which provides a strict but achievable balance between measurement precision and network integrity. If the average closure were larger, such as a few arcseconds or more, it would indicate looser precision and could lead to less reliable positions in the network.