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PT J
AU Gabrieli, F
Lorain, L
Vettore, L
AF Gabrieli, F.
Lorain, L.
Vettore, L.
TI A low-cost landslide displacement activity assessment from time-lapse
photogrammetry and rainfall data: Application to the Tessina landslide
site
SO GEOMORPHOLOGY
LA English
DT Article
DE Landslide monitoring; Photogrammetry; Geomorphologic zonation; Binary
time series
ID SHALLOW LANDSLIDES; DIGITAL PHOTOGRAMMETRY; DURATION CONTROL;
OPTICAL-IMAGES; DEBRIS FLOWS; INTENSITY; ELEVATION; MODELS; SYSTEM; GIS
AB Acquiring useful and reliable displacement data from a complex landslide site is often a problem because of large, localized and scattered erosive processes and deformations; the inaccessibility of the site; the high cost of instrumentation and maintenance. However, these data are of fundamental importance not only to hazard assessments but also to understanding the processes at the basis of slope evolution. In this framework, time-lapse photogrammetry can represent a good compromise; the low accuracy is compensated for by the wide-ranging and dense spatial displacement information that can be obtained with inexpensive equipment. Nevertheless, when large displacement monitoring data sets become available, the problem becomes the choice of the most suitable statistical model to describe the probability of movement and adequately simplify the complexity of a scattered, intermittent, and spatially inhomogeneous displacement field. In this paper, an automated displacement detection method, which is based on the absolute image differences and digital correlations from a sequence of photos, was developed and applied to a photographic survey activity at the head of the Tessina landslide (northeastern Italy). The method allowed us to simplify and binarize the displacement field and to recognize the intermittent activity and ...