TY - JOUR
T1 - Dealing with systematic laser scanner errors due to misalignment at area-based deformation analyses
AU - Holst, Christoph
AU - Medić, Tomislav
AU - Kuhlmann, Heiner
N1 - Publisher Copyright:
© 2018 Walter de Gruyter GmbH, Berlin/Boston.
PY - 2018/4/25
Y1 - 2018/4/25
N2 - The ability to acquire rapid, dense and high quality 3D data has made terrestrial laser scanners (TLS) a desirable instrument for tasks demanding a high geometrical accuracy, such as geodetic deformation analyses. However, TLS measurements are influenced by systematic errors due to internal misalignments of the instrument. The resulting errors in the point cloud might exceed the magnitude of random errors. Hence, it is important to assure that the deformation analysis is not biased by these influences. In this study, we propose and evaluate several strategies for reducing the effect of TLS misalignments on deformation analyses. The strategies are based on the bundled in-situ self-calibration and on the exploitation of two-face measurements. The strategies are verified analyzing the deformation of the Onsala Space Observatory's radio telescope's main reflector. It is demonstrated that either two-face measurements as well as the in-situ calibration of the laser scanner in a bundle adjustment improve the results of deformation analysis. The best solution is gained by a combination of both strategies.
AB - The ability to acquire rapid, dense and high quality 3D data has made terrestrial laser scanners (TLS) a desirable instrument for tasks demanding a high geometrical accuracy, such as geodetic deformation analyses. However, TLS measurements are influenced by systematic errors due to internal misalignments of the instrument. The resulting errors in the point cloud might exceed the magnitude of random errors. Hence, it is important to assure that the deformation analysis is not biased by these influences. In this study, we propose and evaluate several strategies for reducing the effect of TLS misalignments on deformation analyses. The strategies are based on the bundled in-situ self-calibration and on the exploitation of two-face measurements. The strategies are verified analyzing the deformation of the Onsala Space Observatory's radio telescope's main reflector. It is demonstrated that either two-face measurements as well as the in-situ calibration of the laser scanner in a bundle adjustment improve the results of deformation analysis. The best solution is gained by a combination of both strategies.
KW - area-based deformation analysis
KW - misalignments
KW - parameter estimation
KW - self-calibration
KW - sensitivity analysis
KW - terrestrial laser scanner
KW - two-face measurements
UR - http://www.scopus.com/inward/record.url?scp=85043782586&partnerID=8YFLogxK
U2 - 10.1515/jag-2017-0044
DO - 10.1515/jag-2017-0044
M3 - Article
AN - SCOPUS:85043782586
SN - 1862-9016
VL - 12
SP - 169
EP - 185
JO - Journal of Applied Geodesy
JF - Journal of Applied Geodesy
IS - 2
ER -