Abstract
With the continuous development of indoor positioning technology, various indoor applications, such as indoor navigation and emergency rescue, have gradually received widespread attention. Indoor navigation and emergency rescue require access to a variety of indoor space information, such as accurate geometric information, rich semantic information and indoor spatial adjacency information; hence, a suitable 3D indoor model is needed. However, the available models, such as BIM and CityGML, mainly represent geometric and semantic information of indoor spaces, and rarely describe the topological adjacency relationship of interior spaces. To address the requirements of indoor navigation and emergency rescue, a simplified 3D indoor model is proposed in this research. The building components and indoor functional spaces of buildings are described in a simplified way. The geometric and semantic information are described based on CityGML, and the topological relationships of indoor adjacent spaces are represented by CityGML XLinks. While describing the indoor level of detail (LOD) of buildings in detail, the model simplifies building components and indoor spaces, which can preserve the characteristics of indoor spaces to the maximum extent and serve as a basis for indoor applications.
Highlights
Smart cities, as a new urban development concept, extend people’s perceptions and explorations of spatial information from outdoor spaces to indoor spaces [1,2]
Standard developed by buildingSMART [15] describes geometric and semantic information of building components for indoor spaces with a variety of classes, such as IfcWall, IfcSlab, and IfcSpace, which can serve as the basis for indoor applications, such as indoor navigation and emergency rescue [4,16]
We introduce the simplified 3D indoor space model based on City Geography Markup Language (CityGML)
Summary
As a new urban development concept, extend people’s perceptions and explorations of spatial information from outdoor spaces to indoor spaces [1,2]. Standard developed by buildingSMART [15] describes geometric and semantic information of building components for indoor spaces with a variety of classes, such as IfcWall, IfcSlab, and IfcSpace, which can serve as the basis for indoor applications, such as indoor navigation and emergency rescue [4,16]. The model is designed according to CityGML3.00 s LODs concept, taking into account the requirements of indoor navigation and emergency rescue, highlighting the detailed description for indoor space information while ignoring exterior description of buildings. The geometric representation and semantic types of the model still follow the CityGML2.0 schema, and the topological relationship is described for adjacent rooms by XLinks.
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