In surveying, what process helps confirm measurements by ensuring the total of angles is close to 360°?

The correct answer relates to a process in surveying known as "closing the horizon." In surveying, when measuring angles during the process of traversing, the total of the angles measured should ideally sum close to 360 degrees. This is essential for verifying that the angles in a closed loop are consistent and accurate. If the sum of the angles deviates significantly from 360°, this indicates potential errors in measurement that need to be examined and corrected.

Closing the horizon essentially ensures that the surveyor has accounted for all angles in the complete circuit of the survey, allowing them to evaluate and validate the integrity of their measurements. It acts as a check against systematic errors that might occur during the angular measurements.

In contrast, the other options do not specifically denote the process of verifying angle measurements in the same manner. Angle closure typically refers to the need to reconcile differences in the measured angles against expected results but doesn't highlight the summation to 360°. Angle adjustment and correction factor could refer to methods for rectifying inaccuracies, but they do not specifically focus on the angle summation verification aspect critical in surveying.