The Integration of 3D Geodata and BIM Data in 3D City Models and 3D Cadastre

Abstract: The initial geographic information system (GIS) and building information modelling (BIM) are designed and developed independently in order to serve different purposes and use. Within the prolific increase and growing maturity of three-dimensional (3D) technology, both 3D geodata and BIM data can specify semantic data and model 3D buildings that are prominent for the 3D city models and 3D cadastre. 3D geodata can be collected from geodetic surveying methods such as total station, laser scanning and photogrammetry and generate 3D building models by CityGML format for macro analysis on city scale. BIM data has significant advantages in planning, designing, modelling and managing building information, which contains rich details of building elements. Additionally, BIM helps and supports to exchange and share complex information through life-cycle project. Because there are some overlaps between them, the integration of BIM and 3D city models is mutually beneficial for representing comprehensive 3D building models.This thesis is a summary and compilation of two papers, where one is a review paper published in Journal of Spatial Science, and the other is a research paper currently under review in ISPRS International Journal of Geo-Information. The first paper designed and implemented a methodology to formalize the integration of BIM data into city models (CityGML models) that were generated from BIM data and from ALS/footprint data based on the proposed common modelling guidelines. The geometric results of the CityGML models were compared and evaluated visually and quantitatively. The second paper proposed a general framework for sharing and integrating cadastral information with BIM and 3D GIS together with general requirements. Based on the requirements and framework, the case study focused on how to represent and visualize 3D cadastral boundaries legally and technically by integrating BIM at building level and CityGML at city level. Both the Industry Foundation Classes (IFC) model and the CityGML model were connected to Land Administration Domain Model (LADM) at the conceptual level using Unified Modeling Language (UML) models and on database level.The findings of the first paper include investigation of BIM data as a qualified source on the geometric aspects in order to satisfy the need for a more rapid update process of 3D city models, and the second paper shows that the proposed framework and requirements perform well for generating 3D cadastral model in the real-world case study.