In project control surveys, what orders of control are typically used?

In project control surveys, what orders of control are typically used?

• A. Primary (Third Order), Secondary (Fourth Order), and Tertiary Control
• B. Primary (First Order) and Secondary (Second Order)
• C. Tertiary Control Only
• D. All Orders Up to High Order

Answer: (A)

Project control surveys rely on a layered network so you get reliable positioning without the expense of the highest-precision geodetic network. The main reference framework is the primary control, which is established at third-order accuracy. This level provides a stable link to the national or regional datum while staying cost-effective. An intermediate layer, secondary control, uses fourth-order accuracy and extends and strengthens the network toward the work area. The tertiary control is the local, field-ready layer used for staking and detailed surveys, typically at a lower order than secondary. Using these three levels—primary, secondary, and tertiary control—gives a practical, reliable setup for project control surveys. Other configurations either omit a needed level or aim for a higher-order, unnecessarily expensive solution for typical project work.

Project control surveys rely on a layered network so you get reliable positioning without the expense of the highest-precision geodetic network. The main reference framework is the primary control, which is established at third-order accuracy. This level provides a stable link to the national or regional datum while staying cost-effective. An intermediate layer, secondary control, uses fourth-order accuracy and extends and strengthens the network toward the work area. The tertiary control is the local, field-ready layer used for staking and detailed surveys, typically at a lower order than secondary. Using these three levels—primary, secondary, and tertiary control—gives a practical, reliable setup for project control surveys. Other configurations either omit a needed level or aim for a higher-order, unnecessarily expensive solution for typical project work.