Leica’s Orient to Gravity (OTG) Operations.

An Orient to Gravity (OTG) Operation can be used to compensate a tracker’s base frame with respect to gravity. Its important to realize that an OTG operation is a system calibration and will change the way in which measured points are recorded and sent to SA. Comparing measurements before and after a level compensation would be similar to comparing different instruments to each other.

This means that if you intend to perform an OTG there are two required conditions:

  1. A level compensation (OTG) should be performed after each instrument station move prior to any point measurements.

  2. If measurements have already been taken at an instrument plant, a jump instrument operation must be performed prior to performing a level compensation (OTG) and taking additional measurements.