Abstract
Abstract. Semantic 3D city models are increasingly applied for a wide range of analysis and simulations of large urban areas. Such models are used as a foundation for development of city digital twins, representing with high accuracy the landscapes and urban areas as well as dynamic of the city in terms of processes and events. In this context, this paper presents a 3D city model, which is a starting point for development of digital twin of Sofia city. The 3D model is compliant with CityGML 2.0 in LOD1, supporting integration of the buildings and terrain and enriching the buildings’ attributes with address information. District Lozenets of Sofia city is chosen as a pilot area for modelling. An approach for 3D transformation of proprietary geospatial data into CityGML schemas is presented. The integration of the buildings and terrain is an essential part of it, since the buildings often partially float over or sink into the terrain. A web application for user interaction with the 3D city model is developed. Its main features include silhouetting a single building, showing relevant overlay content, displaying shadows and styling of buildings depending on their attributes.
Highlights
Over the last decades, a lot of research efforts are dedicated to development of semantic 3D city models, covering variety city dimensions based on standards such as CityGML
This paper presents the preliminary results from creating a CityGML 2.0 compliant 3D model of the city of Sofia
The initial development of the 3D model is based on cadastral data, which is appropriate for modelling of buildings, green spaces, relief, road network and other CityGML objects in LOD1
Summary
A lot of research efforts are dedicated to development of semantic 3D city models, covering variety city dimensions based on standards such as CityGML Such models go beyond the simple 3D visualisation by providing a solid foundation for a wide range of urban analysis and simulations. As a widely adopted standard, CityGML enables reusability and interoperability of 3D models over different applications Till it is mostly used for modelling of the buildings due to their dominant role within the urban environment and lack of data for other thematic objects such as road infrastructure, underground networks and utilities, water bodies, etc. The project aims to create a city digital twin platform for planning, design, exploration, experimentation and optimization of urban processes and services It involves close collaboration between academia, Municipality of Sofia and IT companies.
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