Spectra Precision FAST Survey Reference Manual - Manual (Page 48)

p46
Angle Balance
This method of processing applies an angle balance to the traverse lines when calculating the coordinates. The angle
balance takes the angular error divided by the number of traverse lines and adjusts the angle of each traverse line by the
calculated amount. The angular error is the difference between the angle balance shot and a reference angle. The
program will prompt you to enter the traverse shot to use as the angle balance shot. The measured direction between the
occupied point and the foresight point in the specified angle balance shot is then compared to a reference angle. The
reference angle is specified as a bearing, azimuth or by a traverse line defined by entering a From Point and a To Point.
The angle balance process is initiated by selecting the angle balance option from the process raw file menu.
The Angle Balance Measurement dialog appears in the figure. Suppose a given traverse started at 24, traversed up to 25,
then around a loop and back to 24 (point 45). If point 45 was the end point or closing shot, the traverse leg from 45 to
46 could be the angle balance shot. It is very common, for example, in closed-loop traversing to take a closing angle
shot from the closing point (45) by measuring the angle along the first traverse leg (24 to 25). That is what occurred in
the case of this sample traverse.