Medić, Tomislav: Efficient calibration strategies for panoramic terrestrial laser scanners. - Bonn, 2021. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc:
author = {{Tomislav Medić}},
title = {Efficient calibration strategies for panoramic terrestrial laser scanners},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2021,
month = jan,

note = {Terrestrial laser scanner (TLS) measurements are unavoidably affected by systematic errors due to internal mechanical misalignments, while the calibration is the fundamental procedure for mitigating these effects and assuring the high measurement accuracy. Despite different existing calibration solutions, the practice of calibrating TLSs for the sake of quality assurance is rarely exercised. The main reason is the inefficiency of the existing solutions requiring considerable investments of time, funding and effort. Therefore, this thesis is dedicated to increasing the efficiency of the existing calibration approaches, development of further efficient calibration approaches, and aiding the selection of the appropriate calibration strategy. It can be separated into three main aspects: First, an optimized calibration field design is derived for the well-established target-based self-calibration approach. It comprises only a handful of targets and requires typically one hour for the calibration procedure, while at the same time assures trustworthy and comprehensive calibration. Second, as the stability of the calibration parameters is found to be one of the limiting factors, the first fully automatic in-situ calibration strategy was introduced in the response to identified efficiency related shortages of the existing in-situ calibration strategies. Finally, within the analysis of different calibration approaches, it was proven that the user-calibration of instruments can indeed improve the point cloud accuracy beyond the manufacturer’s initial factory calibration. Moreover, it is proven that, if necessary, user-calibration can even substitute the manufacturer’s calibration entirely. In the overall view, the findings and methods developed in this thesis contribute to the integration of the TLS calibration practices in the commercial applications and aid their wider acceptance.},
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