INTEGRATED SPACE-TIME MODELLING BASED ON CORRELATED MEASUREMENTS FOR THE DETERMINATION OF SURVEY CONFIGURATIONS AND THE DESCRIPTION OF DEFORMATION PROCESSES – IMKAD II
This project analyses deformation processes for civil structures using Terrestrial Laser Scanning. The two main objectives are development of a space continuous congruence deformation model and implementation of a non-linear sensitivity analysis for it. Research topics of IMKAD I like improved modelling of phase-based scanners are continued and new topics like impulse scanner modelling are addressed. The project’s basis is formed by point clouds, representing an object’s geometry at two epochs. The deformation model requires a functional and a stochastic part considered in a synthetic variance-covariance matrix (SVCM). Furthermore, atmospheric spatial and temporal variations are considered.
Improvements regarding the deformation model, including rigid body movements and deformations, to be developed by TU Vienna foresee using B-spline surfaces for epochal comparison. An estimation of surface parameters and control points leads to adapting of the model selection method developed in IMKAD I.
The SVCM as well as the deformation model is validated by real-world measurements. These include three objects: a laboratory B-spline object, a wooden tower and a concrete dam.
Finally two approaches for linearization of the non-linear sensitivity analysis, regarding optimal Terrestrial Laser Scanner parameters like relative position (based on object distance and angle of incidence) and additional parameters (e.g. quality parameter) are heuristically and automatically derived.
Prof. Dr.-Ing. habil. Dr. h.c. Volker Schwieger
Institute of Engineering Geodesy (IIGS), University of Stuttgart
Prof. Dr.-Ing. Hans-Berndt Neuner – Department of Geodesy and Geoinformation, Engineering Geodesy, TU Vienna
German Research Foundation, DFG Sachbeihilfe IMKAD II
- Kerekes, G., & Schwieger, V. (2020). Elementary Error Model Applied to Terrestrial Laser Scanning Measurements: Study Case Arch Dam Kops. Mathematics, Vol. 8(4)(593), Article 593. https://doi.org/10.3390/math8040593
- Kerekes, G., & Schwieger, V. (2023). An approach for considering the object surface properties in a TLS stochastic model. Journal of Applied Geodesy. https://doi.org/doi:10.1515/jag-2022-0032