Infrastructure Engineering - Research Publications
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ItemVIRTUAL ELEMENT RETRIEVAL IN MIXED REALITY(COPERNICUS GESELLSCHAFT MBH, 2022)Abstract. The application of mixed reality visualisation in construction engineering requires accurate placement and retrieval of virtual models within the real world, which depends on the localisation accuracy. However, it is hard to understand what this means practically from localisation accuracy alone. For example, when we superimpose a Building Information Model (BIM) over the real building, it is unclear how well does a BIM element fit the real one and how small a BIM element are we able to retrieve. In this paper, we evaluate virtual element retrieval by designing an experiment where we attempt to retrieve a set of cubes of different sizes placed in both the real and the virtual world. Furthermore, inspired by existing camera localisation methods for indoor MR being almost exclusively image-based, we use a localisation approach based solely on 3D-3D model registration. The approach is based on the automated registration of a low-density mesh model of the surroundings created by the MR device to the existing point cloud of an indoor environment. We develop a prototype and perform experiments on real-world data which show high localisation accuracy, with average translation and rotation errors of 1.4 cm and 0.24°, respectively. Finally, we show that the success rate of virtual element retrieval is closely related to the localisation accuracy.
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ItemReal-time monitoring of construction sites: Sensors, methods, and applications(ELSEVIER, 2022-04)The construction industry is one of the world's largest industries, with an annual budget of $10 trillion globally. Despite its size, the efficiency and growth in labour productivity in the construction industry have been relatively low compared to other sectors, such as manufacturing and agriculture. To this extent, many studies have recognised the role of automation in improving the efficiency and safety of construction projects. In particular, automated monitoring of construction sites is a significant research challenge. This paper provides a comprehensive review of recent research on the real-time monitoring of construction projects. The review focuses on sensor technologies and methodologies for real-time mapping, scene understanding, positioning, and tracking of construction activities in indoor and outdoor environments. The review also covers various case studies of applying these technologies and methodologies for real-time hazard identification, monitoring workers’ behaviour, workers’ health, and monitoring static and dynamic construction environments.
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ItemA PLATFORM for MULTILAYERED DOCUMENTATION of CULTURAL HERITAGE(Copernicus GmbH, 2021-06-17)Abstract. This paper presents a platform for multilayered documentation of cultural heritage, inspired by the current lack of a heritage BIM approach capable of creating models with both high geometric accuracy and high semantic richness. The platform is developed in the Unity game engine. It comprises several integrated and interconnected layers or datasets that can include data of different types, such as a point cloud, textured polygonal mesh, parametric information model and images, both 2D images and 360° panoramas. We present an overview of the platform concept, the benefits of the proposed multilayered representation and the details on the implementation and integration of datasets. Also, we present some of the innovative functions made possible by this integration, such as point cloud or mesh cutting and preforming measurements on 2D images and 360° panoramas. We perform and present the results of a preliminary analysis of platform functions, which indicates that the platform can be used for accurate measurement and retrieval of 3D coordinates.