Method for automatically extracting CityGML LOD models from IFC model
An automatic extraction and model technology, which is applied in the fields of instrumentation, computing, and electrical digital data processing, etc., can solve the problems of lack of coordination conversion methods, and the inability to realize the automatic extraction and generation of IFC models to CityGMLLOD4 models, etc.
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[0053] The present invention provides a kind of method that automatically extracts CityGML LOD 1-LOD4 model from IFC model, comprises following four steps:
[0054] 1. IFC model analysis:
[0055] The BIM model defines rich semantic information for building components, figure 1 Describes the tree diagram of the building components of the IFC model. The organization of CityGML elements is similar to that of the IFC model. For the tree structure, there are two commonly used analytical methods: one is top-down, and the other is bottom-up . The IfcOpenshell open source library adopts a top-down parsing method, which can quickly parse IFC files. This article uses this open source library to parse IFC files. The main idea of IfcOpenshell is to parse XML files, focusing on parsing the geometric coordinates of each component of the IFC model. IfcOpenshell defines The special data structure is used to store the geometric information and semantic information parsed from the IFC mode...
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