<p><strong>Abstract.</strong> 3D survey methodologies are widely applied to the Cultural Heritage, employing both TLS and close-range photogrammetry with SfM techniques. Laser scanning produces models with high metric reliability and accuracy, whereas the main quality of the 3D photogrammetry is the result in term of photorealistic representation. Many studies have been conducted about the comparison and the integration of these different approaches and the aim of this paper is to contribute with a peculiar case study: the underground Roman bridge of San Lorenzo in Padova (Italy). The investigation regards the resulting point clouds of the intrados (or inner curve) of the central arch, comparing them and providing graphical and analytical outputs. The proposed workflow has the purpose to be a simple but valid tool to detect and evaluate geometrical differences, their significativity and the reliability of the 3D models.</p>
This research experiments the theme of cultural heritage (CH) in architectural/engineering fields, located in urban space. Primary sources and new tactics for digital reconstruction allow interactive contextualization-access to often inaccessible data creating pedagogical apps for spreading. Digital efforts are central, in recent years based on new technological opportunities that emerged from big data, Semantic Web technologies, and exponential growth of data accessible through digital libraries – EUROPEANA. Also, the use of data-based BIM allowed the gaining of high-level semantic concepts. Then, interdisciplinary collaborations between ICT and humanities disciplines are crucial for the advance of workflows that allow research on CH to exploit machine learning approaches. This chapter traces the visualizing cities progress, involving Duke and Padua University. This initiative embraces the analysis of urban systems to reveal with diverse methods how documentation/understanding of cultural sites complexities is part of a multimedia process that includes digital visualization of CH.
The development of applications for mobile devices that exploit the potential of GIS and augmented reality, turns out to be one of the best solutions to encourage sustainable tourism, slow mobility and the enhancement of the cultural heritage present in a given territory. The GIS map of the Abruzzo stretch of the Ciclovia degli Appennini identifies and connects some important artefacts which, by means of Laser Scanning surveys, are the object of the research study. The analysed case of Santa Maria ad Cryptas in Fossa (AQ), one of the medieval churches along the greenway, has provided new ideas for the use of this type of technology. The careful analysis of the architecture and the paintings inside, has favoured the use of augmented reality to bring out elements that are no longer visible (pointed arched roof) and has established connections with other pictorial representations of the period. Lastly, the experiment performed with the new Lidar sensor supplied with the iPhone 12 Pro Max device leads to two considerations: the technology of current smartphones is becoming more and more accurate and reliable; the mixed system of Laser Scanning and photogrammetry, integrated into mobile devices, could guarantee excellent stability in the use of augmented reality.
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