Articles by David Vicenzutto
Cluster analysis, classificazione numerica e remote sensing. Metodi di analisi integrati applicati alla survey presso San Basilio di Ariano nel Polesine (RO)
Giulia Iadicicco, David Vicenzutto, Silvia Paltineri
Abstract
This paper focuses on a multidisciplinary approach used mainly in the post-processing of the data collected in the intensive survey carried out in 2018 in San Basilio di Ariano nel Polesine (RO). At first, the interpretation of aerial photos and the DTM processing for the area of San Basilio have been used to identify features of the ancient landscape before the field survey, in order to better plan the investigations; the results of the analysis on remote sensing and DTM data have been also used during the post-processing phase. Then, the data collected in the field have been digitalized, organized and processed in a database and a GIS, using both cluster analysis and data classification. The research has allowed us not only to confirm and expand the context of the historical and environmental evolution of the area during pre-Roman and Roman period, but also to reflect on the methodology used for the data collection and processing within an intensive field survey. In particular, cluster analysis and numerical classification methods have been compared in order to better understand their potentialities and limits in the data analysis.
«Archeologia e Calcolatori» 2022, 33.2, 53-76; doi: 10.19282/ac.33.2.2022.04
Il rilievo delle superfici tramite fotogrammetria 3D: dal microscavo dei complessi tombali agli scavi in open area
Cristiano Putzolu, David Vicenzutto
Abstract
The need for a quick methodology of 3D surface recording, sensitive to the timing of fieldwork, low cost, and suitable for both micro- and meso-contexts, has induced the writers to develop a standard procedure. It is now possible to obtain a dense x, y, z point cloud starting from the photographic coverage of a surface, respecting precise parameters of overlapping for the different photos picturing the scene, and calibrating the camera. The software used to generate the point cloud is PhotoModeler Scanner, chosen firstly for its internal module of camera calibration and correction algorithm of radial distortion, and secondly for its capacity to verify the position of the different frames and point clouds roto-translating in a known reference system. The key point of the procedure is the importing of the point cloud in a GIS environment, where a DEM is created with an interpolation algorithm. The resulting surface is in the same GIS environment of vector and raster themes documenting the excavation. The procedure was tested in two different case studies: a micro-context corresponding to Tomb 112, a cremation tomb in the Iron Age necropolis of Piovego (Padua, Italy), and a meso-context corresponding to the Late Bronze Age settlement of Gradiscje (Codroipo, Italy). In both cases, meaningful because different in scale stratigraphy and survey issues, it is clear how 3D survey and the subsequent modeling of the point cloud has been fundamental for the understanding of the archaeological record.
«Archeologia e Calcolatori» 2013, 24, 355-370; doi: 10.19282/ac.24.2013.19
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