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Rockfall detection from terrestrial LiDAR point clouds: A clustering approach using R

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2014
Author Tonini M, Abellan A,
Project Characterizing and analyzing 3D temporal slope evolution
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Original article (peer-reviewed)

Journal Journal of Spatial Information Science
Page(s) 95 - 110
Title of proceedings Journal of Spatial Information Science

Open Access

URL http://www.josis.org/index.php/josis/article/view/123/108
Type of Open Access Repository (Green Open Access)

Abstract

In this studywe analyzed a series of terrestrial LiDAR point clouds acquired over a cliff in Puigcercos (Catalonia, Spain). The objective was to detect and extract individual rockfall events that occurred during a time span of six months and to investigate their spatial distribution. To this end local and global cluster algorithms were applied. First we used the nearest neighbor clutter removal (NNCR) method in combination with the expectationmaximization (EM) algorithm to separate feature points from clutter; then a density based algorithm (DBSCAN) allowed us to isolate the single cluster featureswhich represented the rockfall events. Finally we estimated the Ripley’s K-function to analyze the global spatial pattern of the identified rockfalls. The computations for the cluster analyses were carried out using R free software for statistical computing and graphics. The local cluster analysis allowed a proper identification and characterization of more than 600 rockfalls. The global spatial pattern analysis showed that these rockfalls were clustered and provided the range of distances at which these events tend to be aggregated.
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