Verification of laser scanning systems quality

The laser scanning systems are being currently more and more used in a wide spectrum of applications e.g. in documentation of cultural heritage, as-built documentation or for deformation and slide monitoring. Most of those applications require a high quality of the measured data. The measurement and space information processing procedure with a laser scanning system is a black box to a common user so it is necessary to perform the analysis of the data measured in different conditions and to assess their quality on the basis of the analysis. In our experiments we concentrated on observing physical qualities of the laser beam during reflection off the measured object surfaces and assessed accuracy of the measurement on different types of materials under different incidence angles and in different distances. In our next experiment we presumed that distance measurement accuracy determination of the laser scanning systems is easy but angle measurement accuracy determination is much more complicated and in most published cases it is performed indirectly through object modelling from a point cloud. Therefore we concentrated on composition of a new procedure of angle accuracy direct determination from the single points located in a point cloud with using photogrammetric technology, which beside angle accuracy determination enables a more detailed description of laser scanning system internal measurement procedure. TS 24 – Measuremen