Modeling 3D Deformation using Terrestrial LiDAR

Sowmya Selvarajan, Ahmed Mohamed, Grenville Barnes

Abstract:	From nearly any physical location, terrestrial laser scanning systems can simultaneously capture extremely accurate survey-grade points to sub-millimeter accuracy. It’s an effective and accurate way to map objects in conventional surveying and generate true-to-life renderings. A new approach is developed to study 3- dimensional building deformation. The 3D shape information of the deformed building, obtained from terrestrial laser scanner (TLS) is transformed from the LiDAR local coordinate frame to the building coordinate frame. The proposed method allows measurement of the entire building’s deformation on each coordinate frame. In the current project, measurements were also made with conventional surveying tools for comparison; special targets were utilized for that purpose and to geo-reference the LiDAR unit. Through periodic measurements of the deformation of the building and performing analyses with the measured 3D displacements, the magnitude of the deformation is monitored continuously and appropriate corrective measures are applied. In this paper the performance of the proposed technique is presented along with evaluations through the theoretical least squares post-processing analyses and comparisons with displacements obtained from conventional survey. Results of deformation monitoring are also presented. Potential of terrestrial laser scanner in monitoring deformation is discussed.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	2975 - 2983
Cite this article:	Selvarajan, Sowmya, Mohamed, Ahmed, Barnes, Grenville, "Modeling 3D Deformation using Terrestrial LiDAR," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 2975-2983.
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