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Authors: Pesci, A.* 
Loddo, F.* 
Casula, G.* 
Ceccaroni, F.* 
Bianchini, D.* 
Baldi, P.* 
Menci, Luca* 
Issue Date: 2009
Series/Report no.: 2009
Keywords: geophysical processes
crustal deformation
Digital Terrain Models
stereoscopic photogrammetric images
Subject Classification04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring 
Abstract: Several geophysical processes, involving crustal deformation, can be studied and monitored by means of the comparison of multitemporal Digital Terrain Models (DTM) and/or Digital Surface Models (DSM): deformation patterns, displacements, surface variations, volumes involved in mass movements and other physical features can be observed and quantified providing useful information on the geomorphological variations (Butler et al., 1998; Kaab and Funk, 1999; Mora et al., 2003; van Westen and Lulie Getahun, 2003; Pesci et al., 2004; Fabris and Pesci, 2005; Baldi et al., 2005; Pesci et al., 2007; Baldi et al., 2008). Many techniques, including GPS kinematic methodology (Beutler et al., 1995), digital aerial and terrestrial photogrammetry (Kraus, 1998), airborne and terrestrial laser scanning (Csatho et al., 2005), remote sensors on space-borne platforms, both optical and radar stereo option, satellite SAR interferometry (Fraser et al., 2002), are suitable surveying methods for the acquisition of precise and reliable 3D or 2.5D geoinformation. Actually, the technique to capture the evolution of a natural process, rapidly changing the terrain morphology of an area like a volcanic eruption or a rock mass collapse, taking a time of a few seconds or several hours (or more) is the digital photogrammetry. Scientific software exist to manage and process stereoscopic photogrammetric images, requiring professional operators but, recently, more friendly applications are developed to facilitate and make fast but efficient the analysis.
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