3D Modelling of Modern Urban Building Complexes and Sub-units Concept in 3D Cadastre

As space is a fast-reducing commodity in cities, buildings are developed as multipurpose building complexes used for residential, commercial and others. 3D cadastre represents these building complexes as 3D objects with individual building units that have shared surfaces or adjacencies. However, building complexes are often modelled as a single volume. This paper presents the methods to model a 3D building complex with sub-units of mixed uses. A building complex composed of commercial and residential sub-units was modelled based on a building plan and visualized in GIS ready format. The 3D model consists of a set of volumetric units within an exterior shell of the building complex. The sub-units are displayed according to its uses. This can facilitate further spatial analysis that requires adjacency information of sub-units within a mixed-use building complex.