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This problem was easily solved in the image processing phase with the manual addition of markers on the photos, carried out before generating the sparse cloud. The utmost difficulty encountered was with dense vegetation in some points and the inability to place the markers necessary to automate the digital photogrammetry procedure in the upper portions of the structure. In autumn, photogrammetric surveying campaigns on two artifacts were made: the bridge in the locality of Cerro, in the municipality of Fossa, a few kilometers from L’Aquila, and the “Ferracci bridge” in the area of San Vittorino, a district of L’Aquila. In fact, the campaigns conducted in the summer months often had a negative outcome due to the thick vegetation found on the riverbanks. These aspects also affect the acquisition of the metric data with the integrated survey, which therefore must be appropriately designed also based on the season. The results of the surveys highlighted the difficulty of detecting, even if only photographically, some structures due to excessive vegetation and, in some cases, for the inaccessibility of the land adjacent to the artifacts, privately owned or due to the high flow of the river. This circumstance changes the technical perspective of the problem and leads to recognize the need of extending and optimizing common approaches for architectural heritage to distributed networks of valuable structures. As a result, maintenance of these structures means preserving safety and reliability of the infrastructure, but also conservation of historical assets and preservation of the landscape. Due to the time of design and erection, masonry bridges can be addressed as historical structures, so that approaches and techniques developed for this specific class of structures should be taken in proper consideration. However, there are many masonry structures located in the historical centers of European cities and villages as well as many operational bridges outside developed and urbanized areas (the so-called Inner Areas ) that need to be accurately inspected and maintained. It is clear that the spotlight is at the moment focused on those bridges that serve critical infrastructures. The results refer to a road infrastructure located along the Aterno River in the surroundings of L’Aquila (Central Italy) and point out promising perspectives in terms of feasibility and scalability of the approach to large stocks of assets. The survey and inspection protocol, whose first results are here presented, aims to improve the knowledge of the assets, and facilitate the visual inspection. The main contribution of the study lies in the implementation of such an interdisciplinary approach through the application of archaeological stratigraphic method and 3D data management to historical masonry bridges.
This circumstance leads to the development of an integrated approach able to cover the needs of knowledge of the technological and structural features of the bridge along with its history and current conditions. As a consequence, the maintenance and the reliability of existing structures is a key issue for owners and managers of road and railway infrastructures.
Among others, masonry bridges are still widely operational, especially in those regions affected by a limited urbanization and a very high landscape value. Road networks are disseminated of bridge structures whose typology reflects the time of design and construction of the transportation infrastructure and its relevance in the reference geographical area.
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