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AuthorsTeza, G.* 
Pesci, A.* 
Genevois, R.* 
TitleCharacterization of landslide ground surface kinematics from terrestrial laser scanning and strain field computation
Issue Date2007
KeywordsTerrestrial laser scanner
Strain field
Subject Classification04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring 
AbstractAssessment and mitigation of the risk induced by landslide activation need an appropriate phenomenon investigation, to obtain 10 useful information about the failure processes. The first step is the complete kinematics characterization of the landslide ground 11 surface, by evaluating the involved displacement and deformation patterns. A dense displacement field can be obtained from 12 comparison of a series of multi-temporal observations performed by means of terrestrial laser scanning. Subsequently, the strain 13 field can be computed from displacement vectors. In this paper, a modified least square technique is employed to compute the 14 strain on the nodes of a regular grid (2D approach) or on the points of a digital terrain model (3D approach). Such a computation 15 takes into account the displacements, their spatial distribution, as well as the measurement and modelling errors. A scale factor is 16 introduced in order to emphasize the contributions of the experimental points on the basis of their distance from each computation 17 point, and to recognize possible scale-depending behaviours. This method has been implemented in Matlab and applied on two 18 landslides located in the northeastern Italian Alps (Lamosano and Perarolo di Cadore). The experiments show that different 19 kinematics can be recognized, and the presence and influence of eventual discontinuities can be revealed.
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