Laboratory Evaluation of TLS Data Parameterization on Planes Surfaces

Abstract

The use Terrestrial Laser Scanner (TLS) data has been investigated in geodetic monitoring activities of engineering structures such as bridges, dams and concrete towers. The complexity of these systems makes it necessary to search for approaches that minimize errors, which are derived from the primary observations of angles and distances in each three-dimensional point, such as the parameterization of data by geometric elements. This research presents a laboratory evaluation of the stability of the point cloud parameterization process by adjusting data in planes. To carry out the experiment, a prototype containing a controlled moving flat surface was developed, on which pairs of TLS scans were performed in various positions of the plane. In the stability evaluation process, the global test of the adjustment between the scan pairs was used. The results showed that the parameterization stability is conditioned to the positional relationship between the plane and the TLS at the moment of the scan.