What is the primary objective of including redundancy in the design?

• A. Minimize the number of measurements
• B. Reduce cross-ties
• C. Speed up data collection
• D. Achieve the required precision of the control point final coordinates

Answer: (D)

Redundancy in a survey design is included to ensure the final coordinates of control points meet the required precision. By gathering more measurements than strictly necessary, the network becomes over-determined, allowing a least-squares adjustment to distribute random errors among observations. This not only improves overall precision but also provides meaningful estimates of the precision (and reliability) of the final coordinates. Redundancy also helps detect and mitigate erroneous observations, so a single bad reading won’t disproportionately bias the results. It’s not primarily about reducing the number of measurements, speeding up data collection, or reducing cross-ties; those goals are not served by adding redundant observations.