Trita-SOM

QC 20110127 Härtill 4 uppsatser Lic.-avh. (sammanfattning) Stockholm : Kungliga Tekniska högskolan, 2010 Filosofie licentiatavhandling 5055, Drottning Kristinas väg 30, KTH, Stockholm 3D geoinformation has become a base for an increasing number of today’s applications. Examples of these applications are: city and urban planning, real estate management, environmental simulation, crisis and disaster management, telecommunication, facility management and others. 3D city models are presently scattered over different public and private sectors in different systems, different conceptual models, different data formats, different data schemas, different levels of detail and different quality. In addition, the potential of 3D models goes beyond visualisation of 3D objects of virtual scenes to real 3D city models. In such an environment, integration of different sources of data for building real 3D city models becomes more difficult. 3D city models are of two types, design and real world models. Design models are usually used for building industry purposes and to fulfil the requirements of maximum level of detail in the architecture, engineering and construction (AEC) industry. Real world models are geospatial information systems that represent spatial objects around us and are largely represented in GIS applications. Research efforts in the AEC industry resulted in Building Information Modelling (BIM), a process that supports information management throughout buildings’ lifecycle and is increasingly widely used in the AEC industry. Results of different integration efforts of BIM and geospatial models show that only 3D geometric information does not fulfil the integration purpose and may lead to geometrical inconsistency. Further complex semantic information is required. Therefore, this thesis focuses on the integration of the two most prominent semantic models for the representation of BIM and geospatial objects, Industry Foundation Classes (IFC) and City Geography Markup Language (CityGML), respectively. In the integration of IFC and CityGML building models, substantial difficulties may arise in translating information from one to the other. Professionals from both domains have made significant attempts to integrate CityGML and IFC models to produce useful common applications. Most of these attempts, however, use a unidirectional method (mostly from IFC to CityGML) for the conversion process. A bidirectional method can lead to development of unified applicatio