Which method is commonly used to prevent errors in geodetic measurements?

The most effective method to prevent errors in geodetic measurements is the calibration of instruments regularly. Calibration ensures that the instruments are giving accurate readings by comparing them against known standards. This process accounts for any drift, wear, or environmental factors that might affect the precision of the measurements over time.

Regular calibration mitigates systematic errors that can accumulate and lead to significant discrepancies in geodetic data. By maintaining instruments in optimal condition and confirming their accuracy periodically, geodetic engineers can trust their measurements and achieve better reliability and quality in their surveying and mapping tasks.

While the other methods listed can contribute to the overall quality of geodetic work, they do not address the intrinsic accuracy of the measurement instruments themselves as directly as calibration does. For instance, connecting to existing control networks can provide valuable reference points but will not rectify inaccuracies inherent in the instruments. Similarly, unobstructed line-of-sight measurement is essential for certain types of surveys but depends on the accuracy of the instrument being used. Advanced placement techniques can enhance the positioning process, but without proper instrument calibration, those techniques alone cannot ensure the ultimate accuracy of the measurements.