Positional accuracy for primary horizontal and vertical control shall be reported as which terms?

• A. Local Accuracy and Network Accuracy
• B. RMSE
• C. Confidence Interval Only
• D. Standard Deviation Only

Answer: (A)

Positional accuracy for primary horizontal and vertical control is described using two scopes: local accuracy and network accuracy. Local accuracy measures how well a point fits within the nearby, or local, network—it's about the internal consistency and precision of the control within the local area. Network accuracy, on the other hand, describes how well the local network as a whole is tied to the broader geodetic reference framework, reflecting agreement with the national or regional network. Together, they give a complete view of a point’s reliability: strong local accuracy means the point behaves well with nearby points, while strong network accuracy means those local results hold up when connected to the larger coordinate system. Other statistical measures like RMSE, standard deviation, or confidence intervals describe dispersion or uncertainty in different contexts, but the standard way to report primary control positional accuracy uses Local Accuracy and Network Accuracy.