Calibration of a Terrestrial Laser Scanner - Institute of Geodesy and ...

60 3. Calibration of Terrestrial Laser Scanneraxis, then this is not a collimation axis error but an index error for the vertical encoder This means thepositioning of the laser beam shows an encoder reading that is falsified bythe index error These errors,existing in both the horizontal direction and in the vertical direction, can be determined by measurementsPerforming measurements only in one face requires that the encoder readingsin two facescorrected by the collimation errorthave to beP/ ' \/ ' \/