Search results for "cartografia"
showing 10 items of 325 documents
FROM SCAN-TO-BIM TO HERITAGE BUILDING INFORMATION MODELLING FOR AN ANCIENT ARAB-NORMAN CHURCH
2022
Abstract. One of the most significant issues in Cultural Heritage is the management of ancient buildings to monitor their state of conservation or to plan actions in their maintenance; this issue can be now approached thanks to the use of the Scan-to-BIM process. This method allows the creation of parametric models into a BIM environment, which are capable of enhancing the geometrical representation of building elements and integrating different types of data.This paper shows the results of the research activities carried out by the Department of Engineering at University of Palermo (Italy) on applying the Scan-to-BIM approach to the survey and the modelling of an ancient Arab-Norman church…
Il laser scanner terrestre per il rilevamento e la modellazione di zone “instabili”: il versante sottostante il Tempio di Giunone (Agrigento)
2012
Lo studio descrive le operazioni del rilevamento laser scanner terrestre del versante sottostante il Tempio di Giunone nella Valle dei Templi di Agrigento. Il versante è caratterizzato dalla presenza di grossi blocchi rocciosi che si sono staccati dal basamento sommitale sul quale è costruito il Tempio; tale condizione evidenzia una situazione di generale “instabilità” che potrebbe nel tempo mettere a rischio le strutture archeologiche a causa di successivi distacchi. Il lavoro è stato principalmente finalizzato alla verifica dell’utilizzo delle tecniche laser scanning per la produzione di informazioni metriche utili per l’interpretazione geologica dei fenomeni in atto e per le analisi geot…
IL LASER SCANNER TERRESTRE E LA TECNOLOGIA FULL WAVEFORM PER LA MODELLAZIONE TRIDIMENSIONALE IN AMBITO GEOLOGICO
2014
Integrated surveying techniques in cultural heritage documentation
2007
This paper is focused on integration between laser scanning data, CAD modelling and photogrammetric data collected during the survey of one façade of the monument called “Quattro Canti” in the historic centre of Palermo. The investigation has been directed to the production of a 3D photorealistic model of the monument. The “Quattro Canti” monument is formed by four cylindrical façades facing the square where the older streets of Palermo intersect; each façade has a symbolic reference to one of the seasons and is divided in four levels. The façade called “Canto dell’Autunno” has been surveyed both with laser scanning and with photogrammetric techniques. Laser scanning data have been collecte…
Rilievi laser scanner con tecniche di registrazione in situ: il sistema Topcon GLS2000 per il rilievo di siti archeologici
Il lavoro svolto presenta i risultati ottenuti durante una campagna di rilievi laser scanner in ambito archeologico effettuata utilizzando il sistema GLS2000 della Topcon. Le attività di rilievo sono state condotte per la documentazione e ricostruzione tridimensionale della Domus romana all’interno del Parco archeologico di Lilibeo a Marsala. Lo scopo del lavoro è stato quello di utilizzare e verificare le tecniche di registrazione in situ impiegando, in particolare, il metodo della poligonale.
Integration of terrestrial laser scanning and UAV-SFM technique to generate a detailed 3D textured model of a heritage building
2020
The digital twin is among the Top 10 of the strategic technological trends for the period 2007-2019, and it represents a powerful tool for the conservation and enhancement of cultural heritage. It reproduces with "precision" a physical asset, thus allowing to investigate its structure and to analyze the deformations that occur over the years. Various techniques have been introduced to obtain high-resolution 3D models. Among these, the Terrestrial Laser Scanner (TLS) is widely recognized as the gold standard to generate accurate 3D metric reconstructions. TLS allows acquiring a lot of data (point cloud) in a fast way, being not in physical contact with the objects of investigation. By integr…
The Latomiae of Syracuse: A Geotechnical Mapping Through Rock Reflectivity
2014
The archeological site of the Latomia del Paradiso (Syracuse) is endangered by severe instability phenomena due to the shape of walls and underground excava-tion related with the poor mechanical characteristics of the weathered and wet rock. The failure of huge blocks from the ceiling of the underground areas and the detaching of rock "flakes" from the walls surface make the geotechnical zon-ing particularly complex. the zoning is based on the characteristics of the rock wall surface that, in first approximation, can be distinguished in regularized sur-faces because of mining , and in irregular surfaces characterized by fracture prop-agation. The elaboration of reflectivity values obtained …
Integrazione di dati LiDAR ed immagini aeree per il monitoraggio del territorio
2009
La necessità di acquisire, in tempi relativamente brevi, informazioni su edifici, strade, ambiente costruito e naturale, è ormai divenuta indispensabile per svariate applicazioni quali la pianificazione urbana, il controllo del territorio, il monitoraggio ambientale, etc. Le principali tecniche di acquisizione di dati utili agli scopi su esposti sono rappresentate dal rilievo da immagini aeree, satellitari e dal rilievo da laser scanner aviotrasportato. I dati maggiormente significativi che possono essere estratti dalle immagini sono essenzialmente costituiti da tutte quelle geometrie (bordi, spigoli, etc) idonee alla ricostruzione di modelli di città; tuttavia spesso queste tecniche sono i…
Optimizing the Sampling Area across an Old-Growth Forest via UAV-Borne Laser Scanning, GNSS, and Radial Surveying
2022
Aboveground biomass, volume, and basal area are among the most important structural attributes in forestry. Direct measurements are cost-intensive and time-consuming, especially for old-growth forests exhibiting a complex structure over a rugged topography. We defined a methodology to optimize the plot size and the (total) sampling area, allowing for structural attributes with a tolerable error to be estimated. The plot size was assessed by analyzing the semivariogram of a CHM model derived via UAV laser scanning, while the sampling area was based on the calculation of the absolute relative error as a function of allometric relationships. The allometric relationships allowed the structural …
New algorithms to evaluate the real shape of a hull
2018
In this study, a new method to compare rebuilt surfaces of hulls of sailing yachts is presented. In particular, the considered rebuilt surfaces are created through classic reverse engineering approaches. The new method has been developed by means of Grasshopper, a free generative algorithms editor that can be used as plugin of Rhinoceros, one of the most widespread free-form modelling software. In particular, two different algorithms have been developed: the first one allows controlling the quality of the rebuilt surfaces, the second one, instead, allows to measure the deviations between the original CAD Model and the rebuilt surface of the hull. A case study related to the hull of a small …