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  • 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks  (2)
  • 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring  (2)
  • Laser Scanning  (2)
  • 1
    facet.materialart.
    Unknown
    Metodo basato sulla tecnologia laser scanning per la misura delle deformazioni indotte negli edifici dai sismi o altri eventi distruttivi (2013)
    Museo Civico di Rovereto
    Details
    Publication Date: 2013-02-27
    Description: Il monitoraggio di edifici danneggiati in un'area colpita da un terremoto richiede l'uso di tecniche di osservazione e misura in grado di fornire dati molto rapidamente, in particolare in condizioni di emergenza. Tecniche di telerilevamento quali il laser scanner terrestre (TLS) sono in grado di soddisfare tali requisiti perché consentono di ottenere nuvole di punti molto dense in tempo relativamente breve, a loro volta utilizzabili per generare modelli geometrici dettagliati e precisi degli edifici osservati. L'esecuzione di una sessione di misura in condizioni di emergenza è generalmente caratterizzata da forti vincoli sulle possibili posizioni dello strumento utilizzato; ciò comporta che la distanza di acquisizione e l'angolo di incidenza del fascio laser potrebbero essere molto lontani dalle condizioni ottimali per alcune parti, anche molto estese, dell'edificio studiato. Per tali motivi, una corretta interpretazione di dati richiede una serie di esperimenti e di simulazioni numeriche finalizzate ad una realistica quantificazione del rumore di osservazione, registrazione e modellazione, con enfasi sul riconoscimento e sulla riduzione dei corrispondenti artefatti, ossia errori sistematici legati all'uso del TLS in condizioni non ottimali. E' pertanto qui proposta una strategia operativa basata sulla generazione iterativa di mappe morfologiche quali differente tra nuvola di punti e una o più corrispondenti primitive. Si tratta di un metodo di facile uso per il monitoraggio di precisione in condizioni di emergenza. Al fine di metterne in evidenza la validità, sono mostrati i risultati principali (mappe di deformazione) ottenuti dall'applicazione del metodo ad alcuni edifici compiti dal recente terremoto dell'Emilia Romagna.
    Description: CODEVINTEC s.r.l. Milano e IND.A.G.O. snc Rovigo
    Description: Published
    Description: Museo Civico di Rovereto
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: restricted
    Keywords: Laser Scanning ; Misura delle Deformazioni ; Edifici in area sismica ; Metodologia ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 2
    facet.materialart.
    Unknown
    Remote sensing of volcanic terrains by terrestrial laser scanner and RGB data: a case study from the (2007)
    Details
    Publication Date: 2017-04-04
    Description: This work focuses on the use of terrestrial laser scanner (TLS) in the characterization of volcanic environments. A TLS survey of the Vesuvius crater (Somma-Vesuvius volcano, Italy) allows the construction of an accurate, georeferenced digital model of different sectors of the crater. In each sector, the intensity is computed for each point as the ratio between the emitted amplitude and the received one, normalized to the maximum signal, providing the radiometric information. Moreover, the RGB colours of the observed surfaces are collected by means of a calibrated camera mounted on the TLS instrument. In this way, multi-band information is given, since a long range TLS operates in the near infrared band. The radiometric and RGB data are compared in order to verify if they are independent enough to be complementary for model analysis and inspection. The results show that, even if the RGB data are agreeable, a complete study of volcanic environments can be based on radiometric data only. The collected data are able to discriminate different volcanic deposits and to reconstruct their stratigraphy. In addition, our results shed light on the spatial extension of landslides and on the dimensions of rock fall/flow deposits affecting the inner walls of the crater. The remotely acquired TLS information from the Vesuvius crater is compared with that from a sedimentary terrain (coal-shale quarry) to detect possible similarities/differences between these two geological environments.
    Description: Submitted
    Description: reserved
    Keywords: Terrestrial Laser Scanner; Radiometric Data; RGB Images; Image segmentation; volcanic and ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: manuscript
    Format: 2151913 bytes
    Format: application/pdf
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  • 3
    facet.materialart.
    Unknown
    Effects of surface irregularities on intensity data from laser scanning: an experimental approach. (2009)
    Editrice Compositori
    Details
    Publication Date: 2019-11-04
    Description: The results of an experiment carried out with the aim to investigate the role of surface irregularities on the intensity data provided by a terrestrial laser scanner (TLS) survey are reported here. Depending on surface roughness, the interaction between an electromagnetic wave and microscopic irregularities leads to a Lambertian-like diffusive light reflection, allowing the TLS to receive the backscattered component of the signal. The described experiment consists in a series of TLS-based acquisitions of a rotating artificial target specifically conceived in order to highlight the effects on the intensity data due to surface irregularity. This target is articulated in a flat plate and in an irregular surface, whose macro-roughness has a characteristic length with the same order of the spot size. Results point out the different behavior of the plates. The intensity of the signal backscattered by the planar element decreases if the incidence angle increases, whereas the intensity of the signal backscattered by the irregular surface is almost constant if the incidence angle varies. Since the typical surfaces acquired in a geological/geophysical survey are generally irregular, these results imply that the intensity data can be easily used in order to evaluate the reflectance of the material at the considered wavelength, e.g. for pattern recognition purposes.
    Description: Published
    Description: 839-848
    Description: 1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
    Description: JCR Journal
    Description: open
    Keywords: Terrestrial Laser Scanner ; Intensity ; Incidence Angle ; Irregular surfaces ; Data Acquisition and Processing ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    facet.materialart.
    Unknown
    Remote sensing of volcanic terrains by terrestrial laser scanner: preliminary reflectance and RGB implications for studying Vesuvius crater (Italy) (2008)
    editrice compositori
    Details
    Publication Date: 2019-11-04
    Description: This work focuses on the use of terrestrial laser scanner (TLS) in the characterization of volcanic environments. A TLS survey of the Vesuvius crater (Somma-Vesuvius volcano, Italy) allows the construction of an accurate, georeferenced digital model of different sectors of the crater. In each sector, the intensity is computed for each point as the ratio between the emitted amplitude and the received one, normalized to the maximum signal, providing the radiometric information. Moreover, the RGB colours of the observed surfaces can be captured by means of a calibrated camera mounted on the TLS instrument. In this way, multi-band information is given, since a long range TLS operates in the near infrared band. The reflectance and RGB data are compared in order to verify if they are independent enough to be complementary for model analysis and inspection. Results show that the integration of RGB and intensity data can fully characterize this volcanic environment. The collected data are able to discriminate different volcanic deposits and to detect their stratigraphic features. In addition, our results shed light on the spatial extension of landslides and on the dimensions of rock fall/flow deposits affecting the inner walls of the crater. The remotely acquired TLS information from the Vesuvius crater is compared with that from a sedimentary terrain (coal-shale quarry) to detect possible similarities/differences between these two geological environments.
    Description: Published
    Description: 633-653
    Description: 1.10. TTC - Telerilevamento
    Description: 3.5. Geologia e storia dei sistemi vulcanici
    Description: JCR Journal
    Description: open
    Keywords: Lidar ; Vesuvius ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks ; 05. General::05.01. Computational geophysics::05.01.01. Data processing
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
    facet.materialart.
    Unknown
    Multitemporal laser scanner-based observation of the Mt. Vesuvius crater:Characterization of overall geometry and recognition of landslide events (2011)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: Results of observations of the Mt. Vesuvius caldera, carried out by means of terrestrial laser scanning (TLS) in May 2005, October 2006 and June 2009, are reported here. In each survey the whole crater was acquired with 17/20 scans from 6 different viewpoints and the corresponding digital surface models were generated and registered into the UTM-WGS84 reference frame. In this way, a comparison between the multitemporal models leads to an evaluation of the occurred changes. The deformation maps, i.e. the contouring plots of the differences between the models along the direction of maximum variations, showed a progressive mass loss due to rock-falls from the NE vertical crater wall whose area was about 5000m2. The TLS data also showed the accumulation at the bottom. The volume loss which occurred from 2005 to 2009, was computed by subtraction of volumes defined with respect to reference planes parallel to the caldera walls and was estimated to be 20 300 m3. The volume uncertainties due to registration errors, subsampling noise effects, and effects due to choice of the reference plane, were also estimated. Some results were also interpreted on the basis of micro-seismic and meteorological data in order to plan a monitoring technique where seismic signals related to rock-fall and/or signals of intense rainfalls are used as alarms for fast TLS surveys able to characterize the corresponding changes of the caldera walls. The proposed methodology, in particular the simple but effective approach used in the estimation of volume uncertainties, can be applied to each rock slope instability phenomenon, regardless of the particular environment.
    Description: In press
    Description: 1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
    Description: JCR Journal
    Description: restricted
    Keywords: Terrestrial laser scanning ; 3D model ; Vesuvius ; Landslide ; volume ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
    facet.materialart.
    Unknown
    A laser scanning-based method for fast estimation of seismic-induced building deformations (2013)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: Monitoring damaged buildings in an area where an earthquake has occurred requires the use of techniques which provide rapid and safe measurements even in emergency conditions. In particular, remote sensing techniques like terrestrial laser scanning (TLS) can satisfy these requirements, since they produce very dense point clouds in little time and also allow an accurate geometric modeling of observed buildings. Nevertheless, strong constraints on TLS data acquisition geometry, such as acquisition distance and incidence angles, typically characterize an area in seismic emergency conditions. In order to correctly interpret the data, it is necessary to estimate errors affecting TLS measurements in these critical conditions. A reliable estimation can be achieved by means of experiments and numerical simulations aimed at quantifying a realistic noise level, with emphasis on reduction of artifacts due to data acquisition, registration and modeling. This paper proposes a data analysis strategy in which TLS-based morphological maps computed as point-to-primitive differences are created. The method can be easily used for accurate surveying in emergency conditions. In order to demonstrate the proposed method in very diverse situations, it was applied to rapidly detect deformation traces in the San Giacomo Roncole Campanile (Modena), the Asinelli tower (Bologna) and the Cantalovo Church (Verona), three buildings damaged by the Mw 5.9 Emilia Romagna 2012 earthquake (Italy). 2013 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS) Published by Elsevier
    Description: Published
    Description: 185-198
    Description: 1.10. TTC - Telerilevamento
    Description: JCR Journal
    Description: restricted
    Keywords: Architecture ; Change Detection ; Laser Scanning ; Model ; Performance ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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