Abstract
Abstract. In the last decade the Cultural Heritage field has deeply benefited from the opportunities of collecting accurate and detailed 3D information of sites and artifacts using both image- and range-based techniques. Since few years ago these technologies were not so extensively used, mainly because they were very expensive, required expertise and the pipeline and procedures related to their use were not straightforward, nor consolidated. But in the last years significant improvements in the digital survey technologies have been reached, with the principal scope of simplifying reality-based survey procedure and providing a series of different solutions that combine the automation of processes with accuracy and resolution performances. In addition to these aspects, the lowering of costs and the consequent widespread use of some survey solutions, such as, for example, range-based, as well as terrestrial and UAV image-based ones, have recently given strong impulse to the widening of use of these technologies in the Cultural Heritage field. As a consequence, this range of possibilities shows that in this field, where case studies have peculiar geometric and radiometric characteristics and survey conditions are often unique, preliminary investigations and evaluations are mandatory in order to define the most suitable solution to adopt. In this context, this paper presents preliminary results from the Santa Maria di Pomposa survey project, with the purpose of starting a deep investigation on the integration of 3D digital technologies and how they can provide complete and multi-scalar information about complex architectures. This purpose is particularly important in case studies where analysis have to be conducted at different scales of complexity. Structural analysis are just an example of the need to easily handle complete and global information that have to be deeply and detailed analyzed, eventually showing the behavior of structures over time. Within the adopted methodology, the comparison of results obtained using different approaches represents an indispensable step in order to evaluate and select the most reliable and suitable solutions to adopt within the final integrations process.
Highlights
During the last decade several improvements in the digital technologies field, developed with the purpose of easing realitybased surveys and to widen their use in different fields, have provided a series of solutions that combine the automation of different processes with accuracy and resolution
Since in the Cultural Heritage field case studies cannot be attributed to recurrent ones and it is not possible to use pre-defined technologies, nor standard procedures, these continuous advancements represent an important support for many survey projects of complex artifacts that have been proposed in the last decade and that are showing that the integration of different technologies is often the best solution to survey all the geometric and matter characteristics of complex objects. [Velios and Harrison 2002; Guidi et al 2002; Böhler and Marbs 2004; El-Hakim et al 2004; Guidi et al 2006, Guidi et al 2009; Callieri et al 2011; Remondino 2011]
The Cultural Heritage asset analyzed in this paper refers to Santa Maria di Pomposa, a case study that is important for its artistic and cultural relevance, and because it belongs to the first six Italian case studies that have been acquired using digital technologies
Summary
During the last decade several improvements in the digital technologies field, developed with the purpose of easing realitybased surveys and to widen their use in different fields, have provided a series of solutions that combine the automation of different processes with accuracy and resolution. The possibility to use standard digital cameras and low-cost packages to process data is another important issue that has attracted much attention on these solutions This is the reason why a series of projects have been recently promoted in different contexts, investigating the ability of these solutions to provide good quality 3D data in terms of accuracy and resolution [Hermon et al 2010; Kersten and Lindstaedt 2012; Remondino et al 2012; Dellepiane et al 2013; Guidi et al 2013; Manferdini and Galassi 2013]. It shows some preliminary results obtained comparing different outputs from image- and rangebased techniques that represent a key step to select the most suitable solution to adopt for the integration process and both for the improvement of results and for the optimization of the whole process
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