Terrestrial laser scanner to detect landslide displacement fields: a new approach

Authors:
G. Teza;A. Galgaro;N. Zaltron;R. Genevois
Affiliations:
Department of Geology, Palaeontology and Geophysics, University of Padova, Padova, Italy;Department of Geology, Palaeontology and Geophysics, University of Padova, Padova, Italy;Department of Architecture, University of Ferrara, Ferrara, Italy;Department of Geology, Palaeontology and Geophysics, University of Padova, Padova, Italy
Venue:
International Journal of Remote Sensing
Year:
2007

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Abstract

A terrestrial laser scanner (TLS) allows the generation of a detailed model of a landslide surface. In this way, when two or more georeferenced models obtained by multi-temporal scans are available, the landslide displacement field can be computed. Nevertheless, such a computation is a relatively complex task because the recognition of correspondences among the multi-temporal models is required. The Iterative Closest Point (ICP) algorithm allows the alignment of two 3D objects having a common part by iterative shape matching. A new method for the automatic calculation of a landslide displacement field is presented here. It is based on a piecewise application of the ICP algorithm and is made possible by the robustness of this algorithm against noise and small morphological modifications. After a series of numerical experimentations, this method was successfully applied to two test sites located in the North-Eastern Italian Alps affected by high-risk landslides of the slump type (Perarolo di Cadore and Lamosano) with very different observational conditions.