Instrument angle - MDT25

28.19 Instrument Angle

The instrument's horizontal and vertical angle corrections are values added to the angles before calculating stations. They are obtained from the average of the direct and inverse circle calculation errors of the respective instrument set-ups. These values are calculated automatically and can be modified by editing the individual instrument set-ups' data

where:

Hr\' = Corrected horizontal angle

Hr = Original horizontal angle

e~i~ = Observation circle error i

n = Number of observations