Land Surveyor In Training (LSIT) Practice Exam

When reporting positional accuracy for primary horizontal and vertical control, two levels are used: local accuracy and network accuracy. Local accuracy describes how well points within the local control network agree with their positions in the local frame—it's about the precision and consistency of measurements within a localized area. Network accuracy, on the other hand, assesses the overall quality of the control network across a broader region, reflecting how well the network ties into the larger reference framework and how errors propagate across the network. Reporting both conveys that the local network is precise while the network as a whole remains consistent across the wider area. Other statistics like RMSE, confidence intervals, or standard deviation are useful metrics, but they don’t capture this two-tier reporting approach that specifically characterizes primary control networks.