Research On Integrated Prototype System Of Indoor And Outdoor 3D Real Scene Map

With the rapid development of economy,the application of "smart city" is expanding day by day.It is an inevitable trend in the development of urban informatization to process the three-dimensional model of the city.People spend a lot of time in indoor activities,so the internal structure of buildings and indoor map must play an important role.Therefore,on the basis of outdoor 3D model expression,further providing related services of indoor map will improve people's quality of life to a large extent and realize 3D expression more completely.On the other hand,with the continuous maturity and development of WebGL technology,it solves the problems of cumbersome application installation process and poor compatibility under the traditional C / S architecture,and provides a new way to solve the problems in the B / S architecture with good compatibility and high convenience.The integration of outdoor3 D model and indoor map service based on B / S architecture will bring a lot of convenience to urban construction and management.In this study,a teaching building is taken as the research object,the three-dimensional GIS model is constructed by oblique photogrammetry technology,and the standardized and digital BIM Technology is used to express the internal structure information of the research object,so as to reconstruct the objective world more truly and realize the analysis and management.Based on the open-source 3D virtual earth engine------Cesium platform,a 3D visualization management system based on web is constructed.The main research contents and work are as follows:(1)Reconstructing 3D modelsIn-depth study of three-dimensional modeling technology,oblique photogrammetry theory and technology are used to build the three-dimensional model of the research object and surrounding scenes.BIM Technology is used to build a more refined three-dimensional model of the research object as the data base of the outdoor three-dimensional model.(2)Integration of GIS and BIMThis paper analyzes the relevant data standards and specifications of GIS and BIM,and studies the relevant technologies of the integration of the two.At present,the integration of GIS and BIM data is mostly completed on the client side,and the process is complicated.In this study,3Dtiles data format based on WebGL technology is selected as the intermediate format to complete the integration of GIS and BIM data on the browser side.(3)Interior 3D Panoramic MapBased on the 2D floor plan of each floor in the research area created by ArcGIS,the 3D rendering and display of indoor floor plan under the framework of three.js are realized.Through the research of 3D panorama generation technology,the spherical projection method is used to construct Indoor 3D panorama,so as to describe indoor information more truly.(4)3D visual management system based on WebIn order to realize the integration of indoor and outdoor 3D real-world map,the theory and technology of 3D visualization of data in Cesium platform are studied.A 3D visual management system based on web is constructed,which can load the 3D model of building in browser,and combine with the indoor floor map and 3D panorama map to display the interior of 3D model in detail.The function of attribute query and spatial analysis is realized,which enables users not only to have a clear and intuitive understanding of the overall information of the building and the outdoor environment,but also to meet the needs of their understanding of the internal structure and the indoor real map,as well as to achieve the requirements of more in-depth score analysis and management.