GEOMETRY CHECK OF BUILDING STRUCTURES USING BIM AND TLS DATA

BIM (Building Information Modeling) allows the use of a virtual building model throughout the whole life cycle of the building. It is a parametric object-oriented 3D data model of a building, which contains information about structures, elements, and their parameters. The combination of the BIM model with detailed data on the as-built geometry of the building enables an effective geometry check of the structural elements, which leads to in-time intervention in the building process if needed. The requirement of effective data collection is fulfilled by the methods of 3D laser scanning and closerange photogrammetry. The paper describes the possibility of checking the geometry of buildings by comparing the design of a building (as-planned model), derived from a BIM model in the IFC exchange format, to point clouds (as-built model). The proposed approach uses extraction of the geometric parameters of the structural elements from IFC; afterward, segments the point cloud and creates the as-built model; and in the last step, the as-planned and the as-build models are compared. The advantages of the proposed approach over conventional geometry check methods are also discussed.