What is the standard deviation of the baseline measurement?

The standard deviation of the baseline measurement is a statistical indicator that reflects the amount of variability or dispersion of a set of measurements around their mean value. A standard deviation of ± 0.121 suggests that the measured baselines, when gathered from repeated observations, typically vary by this amount from the average baseline value. This level of variation is often considered acceptable, depending on the precision required in geodetic engineering applications.

In the context of geodetic measurements, a smaller standard deviation indicates higher precision and reliability in measurements, which is crucial for accurate positioning and mapping. A standard deviation of ± 0.121 signals a moderate variability in the measurements, implying the measurements are reasonably consistent if this figure aligns with the data collected.

The other options represent varying degrees of potential standard deviations, each indicating different levels of measurement variability. Options with larger standard deviation values could imply less precision, which might not be acceptable depending on the requirements of specific geodetic projects.