Hbim Modelling for an Historical Urban Centre

Abstract

Abstract. The research in the geospatial data structuring and formats interoperability direction is the crucial task for creating a 3D Geodatabase at the urban scale. Both geometric and semantic data structuring should be considered, mainly regarding the interoperability of objects and formats generated outside the geographical space. Current reflections on 3D database generation, based on geospatial data, are mostly related to visualisation issues and context-related application. The purposes and scale of representation according to LoDs require some reflections, particularly for the transmission of semantic information.This contribution adopts and develops the integration of some tools to derive object-oriented modelling in the HBIM environment, both at the urban and architectural scale, from point clouds obtained by UAV (Unmanned Aerial Vehicle) photogrammetry.One of the paper’s objectives is retracing the analysis phases of the point clouds acquired by UAV photogrammetry technique and their suitability for multiscale modelling. Starting from UAV clouds, through the optimisation and segmentation, the proposed workflow tries to trigger the modelling of the objects according to the LODs, comparing the one coming from CityGML and the one in use in the BIM community. The experimentation proposed is focused on the case study of the city of Norcia, which like many other historic centres spread over the territory of central Italy, was deeply damaged by the 2016-17 earthquake.

Advanced 3d Parametric Historic City Block Modeling Combining 3d Surveying, Ai and VPL

“…Although the technologies used in the proposed pipeline are sophisticated, they make the procedure semi-automatic, thus ensuring that even nonexperts in the field can carry out the required operations without the need for high levels of expertise. In comparison to other model-driven experiences reported in the state of the art (Pelliccio et al, 2017;Zhang et al, 2021;Avena et al, 2021;Parrinello et al, 2020), this procedure removes a lot of manual work with little use of resources. The use of a VPL modeling environment compared to BIM modeling environments allows for greater flexibility, especially in export possibilities.…”

“…It is possible to distinguish three main approaches for developing CIM models: bottom-up, top-down and parametric. The first one (or model driven) focuses more on remote sensing on site acquisition (close-and mid-range laser scanning and photogrammetry) with subsequent manual and semi-automatic modeling processes in BIM and CAD environments (Pelliccio et al, 2017;Zhang et al, 2021;Avena et al, 2021;Parrinello et al, 2020). These procedures often merge BIM and GIS data enabling the users to make queries and display models on web-based platform.…”

Digital Twin Smart City: Integrating IFC and CityGML with Semantic Graph for Advanced 3D City Model Visualization

“…In processing IFC data, it is essential to establish a hierarchical relationship between IFC features and their respective parents, including the removal of intermediate features such as openings [ 55 , 56 ]. It is essential to establish a hierarchical relationship between IFC features and their respective parent features.…”