Investigations into the Influence of Object Characteristics on the Quality of Terrestrial Laser Scanner Data

摘要

In contrast to other existing terrestrial surveying instruments, there are not many benchmark tests available for Terrestrial Laser Scanner (TLS) data quality specifications. This paper presents two possible approaches to the standardization of a TLS point data set. Firstly, the ranging accuracy from an instrument to the object is investigated by comparing measured distances by TLS with those of Total Station (TS). In this case, we use two different slope distances with one being about 25 m and the other, about 50 m in range. Secondly, the comparison of data intensity with six different materials, such as aluminum, a sheet of plywood, resin (black & white), steel (black), and laminate (yellow) is carried out. When comparing the distances measured by TS and those scanned by TLS, the standard deviations (Std.) of differences were found to be about 7 mm (50 m range) and 3 mm (25 m range). In the case of plane-fitting of point clouds, aluminum with white color gave better result than that of others, suggesting that the color of an object affects the intensity value of point clouds. It is expected that these results will contribute to the quality evaluation of TLS point clouds and the selection of standard targets.