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Mora, P.
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Mora, P.
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- PublicationRestrictedDetection of Terrain Morphologic Features Using GPS, TLS, and Land Surveys: "Tana della Volpe" Blind Valley Case Study(2010-08)
; ; ; ;Casula, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Mora, P.; Dipartimento di Scienze della Terra e Geologico Ambientali, Università degli Studi di Bologna ;Bianchi, M.G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; ; The aim of this article is to review the potentiality and reliability of the integrated usage of GPS, Terrestrial Laser Scanner (TLS), and Total Station Survey (TSS) measurements in the geomorphologic studies. Test surveys based on these techniques were done in the area of "Tana della Volpe" blind valley and the adjacent "Monticino" quarry, near Brisighella, Ravenna, Northern Apennines, Italy. Such sites are characterised by peculiar geomorphologic attributes such as the presence of slope, karst and anthropic forms. We surveyed about 18,000 GPS points and about 42,200,000 TLS points in a total of 22 scans. The processing of the survey's whole data set produced three distinct arrays of three-dimensional (3-D) coordinates complemented by orthometric heights. Moreover, an integrated multi-step procedure was implemented based on the following premises: 1) the removal of points not referred to the bare earth surface 2) the combination of three coordinate sets into a single one referred to the whole study; 3) the generation of a bare earth digital model; 4) the elaboration of a unified contour map. The resulting high correspondence between the observed forms and the 3-D models was used to realise a detailed thematic geomorphologic map by means of which it is now possible to locate and highlight the forms observed in the field. In particular by means of TLS measurements we found a maximum difference in the spatial attitude of the observed discontinuities of 5.6° and some interesting coincidences in the evaluation of the joint roughness of several centimeters.436 35 - PublicationRestrictedEXPERIMENTAL APPLICATION OF 3-D TERRESTRIAL LASER SCANNING AND ACOUSTIC TECHNIQUES IN ASSESSING THE QUALITY OF STONES USED IN MONUMENTAL STRUCTURES(2007-10-14)
; ; ; ; ;Casula, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Fais, S.; Dipartimento di Geoingegneria e Tecnologie Ambientali - University of Cagliari – Cagliari (Italy) ;Ligas, P.; Dipartimento di Geoingegneria e Tecnologie Ambientali - University of Cagliari – Cagliari (Italy) ;Mora, P.; Dipartimento di Scienze della Terra e Geologico-Ambientali – University of Bologna (Italy; ; ; ; Hellenic Society for NDTThis paper briefly describes the preliminary results of an experimentation aimed to test a new non-destructive methodology based on the integrated application of 3-D terrestrial laser scanning and acoustic techniques in the ultrasonic range (54 kHz) in evaluating the quality of stone materials. Our target is to evaluate the state of conservation of stone building materials by correlating ultrasonic longitudinal pulse velocity and frequency spectra with the reflectivity or reflectance of the reflected 3-D laser scanner beam pulse transmitted to the target of an investigated surface.195 27 - PublicationRestrictedGlobal Positioning Systems and digital photogrammetry for the monitoring of mass movements:application to the Ca’ di Malta landslide (northern Apennines, Italy)(2003)
; ; ; ; ; ; ; ;Mora, P.; Dip. Scienze della Terra e Geologico-Ambientali, Universita` di Bologna, Via Zamboni 67, 40127 Bologna, Italy ;Baldi, P.; Dip. Fisica, Settore Geofisica, Universita` Bologna, Via C. Berti Pichat 8, 40127 Bologna, Italy ;Casula, G.; Istituto Nazionale Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy ;Fabris, M.; DAUR, Universita` di Padova, Via Marzolo 9, 35131 Padoua, Italy ;Ghirotti, M.; Dip. Scienze della Terra e Geologico-Ambientali, Universita` di Bologna, Via Zamboni 67, 40127 Bologna, Italy ;Mazzini, E.; Regione Emilia-Romagna, V.le Silvani 6, 40122 Bologna, Italy ;Pesci, A.; Istituto Nazionale Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy; ; ; ; ; ; Abstract A combination of digital photogrammetry and Global Positioning Systems (GPS) surveying has been used to measure landslide surface displacements and to estimate the volume involved in the movement. Ninety-eight percent of landslides mapped as active in the Emilia-Romagna region of northern Italy are reactivations of dormant mass movements. The Ca’ di Malta landslide, south of Bologna, was chosen to test this integrated system. A 0.5-m cellsize Digital Elevation Model (DEM) with vertical accuracy of 0.1 m was generated using digital photogrammetric techniques. We have used a combination of digital photogrammetry and three GPS techniques to monitor landslide movement. Rapid static surveying in which the survey observations are made for a period of minutes yielded sub-centimetre positions for several marked points distributed on a longitudinal axis along the landslide. Kinematic surveying, in which the observations are carried out continuously, in this case by a walking person, provided models of the surface (1 1 m grid) by measuring the position of irregularly distributed points. Continuous observations over 7 months were made between two GPS receivers. One positioned within the moving landslide body and the other at a fixed location outside the landslide. An automatic procedure was developed to download, process and compute relative movement at constant time intervals. The accuracy achieved with the GPS measurements ranges between several millimetres to a few centimetres for static and kinematic observations, respectively. This integrated survey technique is a cost-effective method that could be applied to other structural and morphological settings. The real-time monitoring could be coupled with a warning system for landslide hazard management and the repeated kinematic GPS surveys derive precise DEMs of a landslide, providing information on geometry, volumes and evolution of the phenomenon.188 35 - PublicationOpen AccessDigital elevation models for landslide evolution monitoring: application on two areas located in the Reno River Valley (Italy)(2004)
; ; ; ; ; ; ; ; ; ;Pesci, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Baldi, P.; Dipartimento di Fisica, Settore Geofisica, Università degli Studi di Bologna, Italy ;Bedin, A.; Dipartimento di Architettura, Urbanistica e Rilevamento (DAUR), Università degli Studi di Padova, Italy ;Casula, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Cenni, N.; Dipartimento di Fisica, Settore Geofisica, Università degli Studi di Bologna, Italy ;Fabris, M.; Dipartimento di Architettura, Urbanistica e Rilevamento (DAUR), Università degli Studi di Padova, Italy ;Loddo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Mora, P.; Dipartimento di Scienze della Terra e Geologico-Ambientali, Università degli Studi di Bologna, Italy ;Bacchetti, M.; Dipartimento di Fisica, Settore Geofisica, Università degli Studi di Bologna, Italy; ; ; ; ; ; ; ; GPS, digital photogrammetry and laser scanning techniques have been applied and compared in the frame of the studies of two complex landslides located in the Emilia-Romagna Region (Northern Italy). The three approaches, characterized by different accuracies, applicability and costs, have demonstrated to be efficient tools to define Digital Elevation Models computed in the same reference system and able to provide data on the landslide motion. The results described in the paper indicate the present low level of landslide activity in recent years. Reliability, costs and execution times of the applied surveying methods are shown and discussed in this paper.412 1110