Geometrische Genauigkeitsuntersuchungen aktueller terrestrischer Laserscanner im Labor und im Feld

This paper summarizes the geometrical investigations of current terrestrial laser scanners at the HafenCity University Hamburg and gives an overview of the geodetic accuracy potential of the latest generation of scanners. Three different independent test methods are presented to investigate geometric accuracy of terrestrial laser scanners under laboratory conditions: (a) distance measurement accuracy to B/W targets and spheres on the 20 m comparator track, (b) comparison of spatial distances in the 3D test field on B/W targets and (c) investigation of the flatness measurement error following the guideline VDI/VDE 2634 /VDI/ VDE 2002/ on a flat stone slab. The reference measurements were realized with the Leica TS60 total station as well as with the Leica AT960 laser tracker. The results of the geometric accuracy tests in the laboratory show very small deviations in the range of 1 – 2 millimetres for almost all scanners, which
corresponds to the manufacturer’s specifications. In addition, five laser scanners were tested in accordance with DVW instruction sheet 7-2014 for standardised testing of terrestrial laser scanners in the outdoor area of HafenCity University Hamburg. For the execution of the so-called field test procedure, only the standard equipment and software of the respective
manufacturers were used. The entire field test procedure, including data acquisition and evaluation, was completed within four to five hours. As expected, no significant distance or angle deviations were detected in any of the measurement systems, so that the tested laser scanners are ready-to-use, taking into account the measurement volume recorded.