Since the early 1990s, there has been a growing interest in four‐dimensional computer aided design (4D CAD) for construction project planning. Commercial 4D CAD applications are becoming more accessible and the use of this technology allows the construction planner to produce more rigorous schedules. A review of the technical competencies of these packages highlights that most of the commercially available packages concentrate on the use of 4D CAD simulations for aesthetic visualization purposes. Very few packages offer the ability to carry out analytical tasks on the developed simulation and this is often left to the interpretation of the user. A thorough appraisal of emerging research developments in 4D planning highlights that this technology is employed for various applications; however, the amount of detail required in a 4D simulation is still ambiguous. A model is proposed to determine the attributes required for use with each of the various applications of 4D CAD simulations. Finally, various lines of future research are highlighted, including the need for improved use of data exchange standards and the automation of linking the construction tasks to the 3D CAD model.

Purpose: The purpose of the paper is to present a study which exploited synergies between the fields of Heritage BIM, conservation and building translocation to develop a new approach to support a digitally enabled translocation process. The translocation (or relocation) of buildings or structures is a niche area of the construction sector and much of the significant work in this field has focused on the relocation of heritage buildings. However, hitherto there was a paucity of work between translocation and the process and technology of BIM.Design/methodology/approach: The study employed a constructive research approach to analyse the phenomenon of heritage translocation. As part of this approach, semi-structured interviews were undertaken with professionals engaged in heritage translocation projects within the UK, and this was supported by a multi-faceted review of literature within the cross cutting themes of translocation and HBIM. Building on the results, a BIM-enabled process was implemented to support the translocation of a 19th-century timber framed building in the UK.Findings: Following analysis of results of semi-structured interviews and supported by findings from prevailing literature in the field of translocation and HBIM, a HBIM for Translocation Conceptual Framework (TransHBIM) was developed. Building on the key constructs of the framework, a HBIM-based workflow was implemented to develop a digitally enabled translocation process, which provided a new approach to managing and documenting heritage translocation where disassembly and reconstruction are utilised. The workflow provided a more effective way of documenting individual elements of the building within a digital environment opening up potential for new simulation of the entire process.Originality/value: Current approaches to translocation involve traditional/manual methods of recording the building and cataloguing the key heritage elements for all aspects of the process. This new approach implements BIM technologies and processes along with the use of barcode or RFID tags to create a digital bridge between the physical elements of the building and the BIM database. This provides more accurate recording of the heritage and also opens up opportunities to support the process with additional digital simulation techniques enhancing the efficiency of the entire process.

Construction planning plays a fundamental role in construction project management that requires teamwork among planners from a diverse range of disciplines and in geographically dispersed working situations. Model-based four-dimensional (4D) computer-aided design (CAD) groupware, though considered a possible approach to supporting collaborative planning, is still short of effective collaborative mechanisms for teamwork because of methodological, technological, and social challenges. Targeting this problem, this paper proposes a model-based groupware solution to enable a group of multidisciplinary planners to perform real-time collaborative 4D planning across the Internet. In light of the interactive definition method, and its computer-supported collaborative work (CSCW) design analysis, this paper discusses the realization of interactive collaborative mechanisms from software architecture, application mode, and data exchange protocol. These mechanisms have been integrated into a groupware solution...

Since the late 2000s, numerous studies have focused on the application of Heritage Building Information Modelling (HBIM) processes and technologies for the documentation of the historic built environment. Many of these studies have focused on the use of BIM software tools to generate intelligent 3D models using information gathered from a range of data capture techniques including laser scanning and photogrammetry. While this approach effectively preserves existing or partially extant heritage, it faces limitations in reconstructing lost or poorly documented structures. The aim of this study is to develop a novel approach to complement the existing tangible-based HBIM methods, towards an ‘Echo-based’ Heritage Digital Twin (EH-DT) an early-stage digital representation that leverages intangible, memory-based oral descriptions (or echoes) and AI text-to-image generation techniques. The overall methodology for the research presented in this paper proposes a three-phase framework. Phase 1: engineering a standardised heritage prompt template, Phase 2: creation of the Architectural Heritage Transformer, and Phase 3: implementing an AI text-to-image generation toolkit. Within these phases, intangible data, including collective memories (or oral histories) of people who had first-hand experience with the building, provide ‘echoes’ of past form. These can then be converted using a novel ‘Architectural Heritage Transformer’ (AHT), which converts plain language descriptions into architectural terminology through a generated taxonomy. The output of the AHT forms input for a pre-created standardised heritage prompt template for use in AI diffusion models. While the current EH-DT framework focuses on producing 2D visual representations, it lays the foundation for potential future integration with HBIM models or digital twin systems. However, the reliance on generative AI introduces potential risks of inaccuracies due to speculative outputs, necessitating rigorous validation and iterative refinement to ensure historical and architectural credibility. The findings indicate the potential of AI to extend the current HBIM paradigm by generating images of ‘lost’ heritage buildings, which can then be used to enhance and augment the more ‘traditional’ HBIM process.

Previous work in digital terrain modeling (DTM) has shown that if regular gridded-data sets are used in the construction of the model, both the resolution of the gridded-data set and the characteristics of the terrain being modeled have an effect on the accuracy of digital terrain models. The main objective of this study is to test the hypothesis that both the resolution of the gridded-data set and the characteristics of the terrain being modeled have an effect on the accuracy of any derived data. To test this hypothesis, the terrain was classified in terms of its roughness. Various forms of data were derived from the terrain model; these include volumes, surface area, contours, and cross sections. The accuracy for each of these quantities was calculated by comparing them with values obtained from a control model. This research concluded that by both increasing the resolution of the regular gridded-data sets and varying the characeristics of the terrain, the accuracy of any derived data is affected.