In this paper, we propose a comprehensive and optimised workflow for the documentation and the future maintenance and management of a historical building, integrating the state of the art of different techniques, in the challenging context of industrial archaeology. This approach has been applied to the hydraulic work of the “Sostegno del Battiferro” in Bologna, Italy, an example of built industrial heritage whose construction began in 1439 and remains in active use nowadays to control the Navile canal water flow rate. The initial step was the definition of a 3D topographic frame, including geodetic measurements, which served as a reference for the complete 3D survey integrating Terrestrial Laser Scanning (TLS), Structured Light Projection scanning, and the photogrammetric processing of Unmanned Aircraft System (UAS) imagery through a Structure from Motion (SfM) approach. The resulting 3D point cloud has supported as-built parametric modelling (Scan-to-BIM) with the consequent extraction of plans and sections. Finally, the Heritage/Historic Building Information Modelling (HBIM) model generated was rendered and tested for a VR-based immersive experience. Building Information Modelling (BIM) and virtual reality (VR) applications were tested as a support for the management of the building, the maintenance of the hydraulic system, and the training of qualified technicians. In addition, considering the historical value of the surveyed building, the methodology was also applied for dissemination purposes.

Urban and territorial development increasingly threatens the preservation of architectural heritage, often leading to degradation or loss. Many historic architectural works, once integral to community identity, now face the impacts of time and neglect. Addressing these challenges requires innovative solutions, and digital technologies offer significant potential for the conservation and enhancement of cultural heritage. This study employs reality-based 3D modeling techniques to generate accurate digital reconstructions of the Church of Santa Croce in Ravenna (Italy), used here as a case study to demonstrate a workflow for phasing analysis and interactive visualization of architectural transformations. The objective is not to produce a philological reconstruction, but to propose a methodological approach for digitally documenting and visualizing, with geometric rigor, the different constructive phases of historical buildings that have undergone structural changes. Using a spatial–temporal navigation approach, the research explores the various historical phases of the site within an interactive 3D virtual environment. The resulting platform facilitates both scholarly investigation and public engagement by providing immersive visualization and enhanced understanding of the monument’s transformation over time. Through this case study, the project underscores the critical role of contemporary digital tools in cultural heritage conservation and explores novel methods for communicating and disseminating historical knowledge.

In recent years, increasing attention has been directed toward the application of digitization through geomatic-based technologies for museum assets. These powerful tools have proven valuable in assisting museums in the dissemination of cultural heritage. Additionally, museums around the world are implementing strategies to improve the accessibility of their assets by involving the use of 3D digital reconstruction. The 3D high-precision survey is employed in several fields to scan objects with a geometrical accuracy up to the micrometer level. These technologies come into play when dealing with detailed surfaces and complex geometry, as often occurs with cultural heritage assets. This paper presents a set of experiences in high-precision 3D scanning and post-processing operations in the framework of a project at the Territory Museum of Riccione (Italy). The 3D data acquisition methodology conducted and digital operations are reported on for some of the scanned artifacts.

Highlights: Geomaticsthree-dimensional (3D)reconstruction of lost Syrian heritage (PalmyraRoman Theatre)with spherical photogrammetry, recreating the monument’s conditions before its destruction. Operationsof polygon decimationto optimise the geometry of the 3D model for virtual reality (VR) and metaverse applications, including texturing operations to enhance realism. Development of a virtual environmentto be explored in a shared and immersive metaverse platform, available online to disseminate the historical significance of the Roman Theatre in Palmyra. Cultural heritage encompasses both tangible and intangible aspects for each of us, and efforts must be made to safeguard this legacy for future generations. Unfortunately, in addition to natural and environmental degradation, human activities pose a significant threat to the integrity of historical sites. Monuments and architecture have frequently been intentionally destroyed in conflict zones all over the world. Three-dimensional (3D) and virtual technologies can serve as tools to digitally preserve these sites and raise awareness about the importance of historical properties to the general public, particularly when physical sites are at risk or no longer exist. This challenging field of lost heritage is the framework of this project, in which a procedure of geomatics-based techniques such as spherical photogrammetry, 3D modelling and virtual reality (VR) technologies was developed to reconstruct lost historical architecture. The Roman Theatre in Palmyra, Syria, partially destroyed during Syria’s war in 2017, serves as a case study. The methodology report starts with the description of the metrological foundation of the 3D model construction, i.e. spherical photogrammetry as developed by Prof. Fangi (Marche Polytechnic University). Then, the geometry optimisation phase carried out to accomplish the VR limitations in terms of polygon count is presented. Ultimately, the procedure for the virtual environment construction is explained, as well as the development of a metaverse scenario to be visited and shared on an online-based platform. This collective virtual experience aims to revive the destroyed architecture and communicate its significance to the public through a collective and interactive virtual exploration. This study also includes experiments to assess user response, providing insights into methodology effectiveness in conveying Palmyra’s Theatre historical relevance and shedding light on the users’ perceptions of virtual tools usage for lost heritage dissemination. The evaluation questionnaire’s results will guide the project’s future developments.

Collecting pavement texture information is crucial to understand the characteristics of a road surface and to have essential data to support road maintenance. Traditional texture assessment techniques often require expensive equipment and complex operations. To ensure cost sustainability and reduce traffic closure times, this study proposes a rapid, cost-effective, and non-invasive surface texture assessment technique. This technology consists of capturing a set of images of a road surface with a mobile phone; then, the images are used to reconstruct the 3D surface with photogrammetric processing and derive the roughness parameters to assess the pavement texture. The results indicate that pavement images taken by a mobile phone can reconstruct the 3D surface and extract texture features with accuracy, meeting the requirements of a time-effective documentation. To validate the effectiveness of this technique, the surface structure of the pavement was analyzed in situ using a 3D structured light projection scanner and rigorous photogrammetry with a high-end reflex camera. The results demonstrated that increasing the point cloud density can enhance the detail level of the real surface 3D representation, but it leads to variations in road surface roughness parameters. Therefore, appropriate density should be chosen when performing three-dimensional reconstruction using mobile phone images. Mobile phone photogrammetry technology performs well in detecting shallow road surface textures but has certain limitations in capturing deeper textures. The texture parameters and the Abbott curve obtained using all three methods are comparable and fall within the same range of acceptability. This finding demonstrates the feasibility of using a mobile phone for pavement texture assessments with appropriate settings.

Archaeological sites characterized by the coexistence of extensive above-ground terrain and hypogeum structures present major challenges for accurate and comprehensive geospatial documentation. Conventional survey approaches—such as static terrestrial laser scanning (TLS), total-station measurements, and aerial photogrammetry—often suffer from operational constraints, particularly in the presence of narrow underground spaces, low or absent illumination, harsh environmental conditions, and restrictions on UAV deployment. Additional complexity arises when both surface and subterranean elements must be consistently georeferenced to a common global reference system, especially where establishing a traditional topographic–geodetic control network is impractical. Within the framework of the EIMAWA Egyptian–Italian Mission conducted by the University of Milano since 2018, the Geomatics group of the University of Bologna designed and implemented a multi-scale multi-technique 3D documentation workflow, with a prominent role assumed by Simultaneous Localization and Mapping (SLAM) mobile laser scanning. The approach was supported by GNSS measurements providing centimetric accuracy. SLAM was employed to document both the surface necropolis and multiple hypogeal tombs, enabling rapid acquisition of dense three-dimensional data in environments where traditional techniques are limited. All datasets were integrated within a unified reference system, resulting in a coherent, multi-layered spatial dataset representing both landscape and underground spaces. The results demonstrate that SLAM can produce dense point clouds that document at few-centimetric level accuracy and continuously both above- and below-ground contexts. Quantitative analyses of the co-registration and mutual alignment of multiple SLAM datasets confirm a high degree of internal consistency, further enhanced through post-processing refinement. Overall, the experience indicates that this solution represents a practical and reliable technique for complex archaeological surveying.