Land Surveyor In Training (LSIT) Practice Exam

The network positional accuracy is about how uncertain the computed coordinates of a control point are after the network is adjusted, relative to the geodetic datum. This uncertainty comes from the propagation of measurement errors through the network solution, and it is usually expressed as a 95% confidence region (often a 3D ellipsoid) around the point’s coordinates. In practice, the smaller this accuracy value, the more precisely the point’s position is known with respect to the datum. It’s not about how long the point’s coordinates stay the same over time, not about how far apart control points are from each other, and not about the precision of the surveying instruments themselves—those relate to stability, point density, or instrument capability rather than the resulting coordinate accuracy within the datum.