Research and implement of 3D data integration between 3D GIS and 3D CAD
Li, Juan ... [et al.]
3D GIS and 3D CAD system describe the same real-world objects but they belong to different domains. The data involved in the two systems are therefore quite different. Along with the evolution of information technology and 3D representation of geospatial information, more and more 3D applications demand both of them to be used together. This paper focuses on how to integrate the 3D data of 3D GIS and 3D CAD. This paper describes 4 approaches for the data integration, i.e. direct data import, shared access to database, formal semantic and integrated data management and file translation. Based on the last approach, this paper designs the scheme of data integration. This scheme focuses on two aspects: geometry exchange and the information loss due to file translation. On geometry exchange, after this paper points out the how-to of translating between the complex geometric description in 3D CAD and the simple description in GIS of some graphical primitives, e.g. line, surface and polygon, it focuses on the translation of 3DSOLID. In 3D CAD, geometric information of 3DSOLID cannot be read from DXF (Data eXchange Format) file directly. This paper researches three approaches for this problem: (a) making a plug-in using ObjectARX (an AutoCAD API) to extract the geometric information from the 3D CAD environment; (b) converting 3DSOLID to appropriate representation (such as POLYFACE MESH) in 3D CAD; and (c) inserting 3DSOLID into GIS environment as a point.
Event: XXIII International FIG Congress : Shaping the change
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