Integrated Space-Time Point Cloud Modelling – IMKAD II

Associated Project 7 (AP 7)

IntCDC Associated Project 7 – Integrated Space-Time Point Cloud Modelling – IMKAD II
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 the development of a space continuous congruence deformation model and the implementation of a non-linear sensitivity analysis for it. Research topics of IMKAD I, such as improved modelling of phase-based scanners, will be continued and new topics, such as impulse scanner modelling, will be addressed. The basis of the project are point clouds representing the geometry of an object in two epochs. The deformation model requires a functional and a stochastic part, which are considered in a synthetic variance-covariance matrix (SVCM). Spatial and temporal atmospheric variations are also taken into account.

Improvements to the deformation model, including rigid body motion and deformation, to be developed at the TU Vienna, will use B-spline surfaces for epochal comparison. An estimation of surface parameters and control points leads to an adaptation of the model selection method developed in IMKAD I.

Both the SVCM and the deformation model will be 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 linearising the non-linear sensitivity analysis with respect to optimal terrestrial laser scanner parameters such as relative position (based on object distance and angle of incidence) and additional parameters (e.g. quality parameters) are heuristically and automatically derived.

PRINCIPAL INVESTIGATOR

Prof. Dr.-Ing. habil. Dr. h.c. Volker Schwieger
Institute of Engineering Geodesy (IIGS), University of Stuttgart

RESEARCHER

Dr.-Ing. Gabriel Kerekes (IIGS)

PARTNERS

Prof. Dr.-Ing. Hans-Berndt Neuner – Department of Geodesy and Geoinformation, Engineering Geodesy, TU Vienna

FUNDING

German Research Foundation, DFG Sachbeihilfe IMKAD II

PEER-REVIEWED PUBLICATIONS

  1. 2020

    1. 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

OTHER PUBLICATIONS

  1. 2023

    1. 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

    

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