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Volume 45 | Copyright
Adv. Geosci., 45, 57-62, 2018
https://doi.org/10.5194/adgeo-45-57-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Jul 2018

27 Jul 2018

Three-dimensional imaging from laser scanner, photogrammetric and acoustic non-destructive techniques in the characterization of stone building materials

Maria Giovanna Bianchi1, Giuseppe Casula1, Francesco Cuccuru2, Silvana Fais2,3, Paola Ligas2, and Concetta Ferrara2 Maria Giovanna Bianchi et al.
  • 1INGV, Sezione di Bologna, Bologna, 40128, Italy
  • 2Department of Civil and Environmental Engineering and Architecture (DICAAR), University of Cagliari, Cagliari, 09123, Italy
  • 3Consorzio Interuniversitario Nazionale per l'Ingegneria delle Georisorse, CiniGeo, Roma, 00186, Italy

Abstract. When combined, the three-dimensional imaging of different physical properties of architectural monumental structures acquired through different methodologies can highlight with efficiency the characteristics of the stone building materials. In this work, we compound high resolution Digital Color Images (DCI) and Terrestrial Laser Scanner (TLS) data for a dense 3-D reconstruction of an ancient pillar in a nineteenth century building in the town of Cagliari, Italy. The TLS technique was supported by a digital photogrammetry survey in order to obtain a natural color texturized 3-D model of the studied pillar. Geometrical anomaly maps showing interesting analogies were computed both from the 3-D model derived from the TLS application and from the high resolution 3-D model detected with the photogrammetry. Starting from the 3-D reconstruction from previous techniques, an acoustic tomography in a sector of prior interest of the investigated architectural element was planned and carried out. The ultrasonic tomography proved to be an effective tool for detecting internal decay or defects, locating the position of the anomalies and estimating their sizes, shapes, and characteristics in terms of elastic-mechanical properties. Finally, the combination of geophysical and petrographical data sets represents a powerful method for understanding the quality of the building stone materials in the shallow and inner parts of the investigated architectural structures.

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The combination of high resolution Digital Color Images, Terrestrial Laser Scanner and Digital Photogrammetry survey is presented. Starting from this 3-D model an Acoustic Tomography was planned and carried out using geophysical and petrographical data sets. The different nature of the 3-D data volume provides a less ambiguous image of the materials and contributes in efficiency by increasing both fidelity and resolution in the non-destructive diagnostic process of architectural structures.
The combination of high resolution Digital Color Images, Terrestrial Laser Scanner and Digital...
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