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.
Highlights
Integrating and harmonising the geometric and semantic component of 3D information management is an important research priority in various communities
Our main objective was to conduct the modelling phases in a comparative way, retracing the analysis of the point clouds through optimisation and segmentation, to trigger the objects modelling according to the LOD, comparing the one coming from CityGML and the one in use in BIM community
Parametric modelling is proven to be more suitable for new constructions, the versatility of the modelling tools are adequate for the scenario of a city characterised by a historical building and architectural heritage
Summary
Integrating and harmonising the geometric and semantic component of 3D information management is an important research priority in various communities. Many reflections on the semantic component have been raised, starting from the considerations on methods and formalisms for integrating heterogeneous information (De Luca, 2011) This investigation on geospatial data continued up to the most recent proposals to manage vocabularies, libraries of object and semantics, in the direction of mutual enrichment between BIM modelling and Geographic Informative Systems (Brumana et al, 2019). This contribution’s research questions try to develop some tools to originate object-oriented modelling in the HBIM environment. Both the urban and architectural scale, from point clouds obtained by UAV (Unmanned Aerial Vehicle) photogrammetry and TLS (Terrestrial laser scanning) 3D survey have been considered. The classes of objects of data models and the classification of the damages ascertained after the 2016 earthquake are the semantic information represented
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