Operator Accuracy in Angle Measurement and Transfer

Abstract

A series of three experiments was conducted to determine operator accuracy in the measurement and transfer of angles with a first-order theodolite. Accuracy was expressed in terms of the variability of operators' measurements and transfers. Experienced operators showed a standard deviation of measurements of 0.51 sec and a standard deviation of transfers of 2.89 sec. Newly trained operators showed an estimated standard deviation of measurements of 0.51 and 0.52 sec in two successive measuring sessions. Results with newly trained operators indicated that operators who wear glasses with satisfactory correction may be considered equivalent to operators with “normal” eyesight. Typical measurement and transfer procedures are discussed and recommendations for modification of these procedures are given.