Study Of BIM And 3DGIS Integrated Technology And Construction Of Transportation Information System

In recent years,the technology of BIM(Building Information Modeling)has been used more and more widely in the field of inland transportation construction with the characteristics of multiple information of the full life cycle of integrated traffic engineering.The BIM model has the characteristics of refined geometric structure,ample semantic information and obvious parameter characteristics,and it provides the informatization management function of the full life cycle of traffic engineering projects.The three-dimensional geographic information system(3DGIS)focuses on the management and analysis of three-dimensional spatial geographic information,and emphasizes the presentation of macroscopic geographical information scenes.The key point of the present re-search is how to combine BIM with 3DGIS,to make spatial description and expression of traffic engineering,to make unified modeling of monomer macro-scopic spatial information,and the deep sharing of information and full life cycle management.For this purpose,this paper studies the integration technology of BIM and 3DGIS,to make the collection,management and unified expression of over-ground and underground fundamental geographic information and attribute information come true.The main contents are as follows:(1)The analysis and visualization based on IFC(Industry Foundation Class)standard format documents.Analyze the geometrical information in IFC documents,use OpenGL to visualize the IFC format documents,and achieve interactive design.(2)The conversion and integration methods of BIM and 3DGIS.Firstly,analyze the difference between BIM and 3DGIS models,elaborate the traditional format conversion and integration methods.Secondly,put forward the conversion method based on Revit platform,through the secondary development of Revit software,the conversion and export of RVT format model geometrical information and attribute information are realized.The paper studies the conversion method and integration methods based on Bentley Microstation platform format,and achieve the export of geometric information of BIM model by DGN format.Finally,through the secondary develop-ment of Skyline,the export and integration of BIM model is realized systematically.(3)Developed the information system of transportation engineering management of BIM and 3DGIS integrated technology.The system has completed the integration management of BIM and 3DGIS,and achieves functions from 3DGIS visualization,roaming and three-dimensional spatial analysis,to BIM construction management,construction dynamic simulation and construction progress overview.The paper devotes to model transformation and integrated technology of BIM and 3DGIS,also,on the basis of the analysis and visualization of IFC standard documents,the paper proposes a format conversion and integration method based on Revit platform and Bentley Microstation platform,and constructs transportation engineering management information system of BIM and 3DGIS integrated technology.The system has been applied in the construction site,which has achieved good results and improved the efficiency of construction management.At the same time,it also proved the integration method of BIM and 3DGIS that proposed by the paper.