| With the rapid advancement of urbanization,an increasing number of people are choosing to move to cities,leading to the generation and accumulation of massive amounts of geographic information data.At the same time,the continuous development of new technologies has given rise to various novel data types,such as real-scene image data and oblique photogrammetry data,which have become essential supplements to traditional data sources.In the process of digital city construction in Changchun,a large amount of framework data has been accumulated.However,most of these framework data are static,lacking in granularity and coverage,and thus unable to meet the higher demands of smart cities for timeliness,accuracy,and coverage of information resources.Therefore,it is necessary to consider upgrading the existing spatial framework data to spatiotemporal information data,in order to expand data coverage and accuracy and support the application of new data types.Building Information Modeling(BIM)data,with its comprehensive information about buildings,is widely used in various applications.The integration of BIM data with GIS data can improve urban planning and management efficiency,enhance the sustainability of buildings and cities,and ultimately achieve better data visualization and decision support.Geographic information is one of the fundamental information sources for urban planning,construction,and development,and it also serves as the basic framework for integrating other social and cultural information.In this paper,a BIM and multi-source geospatial data fusion system is developed to address the issues of BIM and GIS data integration,as well as urban geographic information data management.By classifying,integrating,and processing existing geographic information data,it is incorporated into a spatial database for storage and management,and the data is shared through corresponding services using SuperMap software.With the help of SuperMap plugins developed for Revit,BIM data is converted to GIS data,and SuperMap’s related map databases are used to construct map scenes and spherical scenes.Based on this,frontend and back-end technologies such as JavaScript,Vue.js,Ajax,and SpringMVC are employed to build the system framework,ultimately achieving the overlay and fusion of BIM data with multi-source geospatial data and enabling the querying,analysis,management,and updating of multi-source geographic information data within cities.The research achievements of this paper include:(1)The construction of a spatial database is essential for the storage and management of multi-source geospatial data.Based on the data type,existing geospatial information data can be divided into three categories: vector data,remote sensing image data,and three-dimensional scene data.Each category of data is processed according to its respective standard and stored in the spatial database.The SuperMap iServer is utilized to publish these data in the form of map and data services for client-side retrieval and loading of the required data.(2)Achieving the overlay and fusion of BIM and multi-source geospatial data.Using SuperMap’s developed plugins,BIM data in Revit is successfully converted into GIS data.SuperMap iClient for Cesium’s provided methods are employed to overlay and fuse the BIM model with building white model data.After optimizing the refined models and oblique photogrammetry models,the loading speed of data called by web pages is effectively improved.Ultimately,the overlay and fusion of multi-source 3D data are successfully achieved.(3)Building map scenes and spherical scenes based on SuperMap-related map databases and developing various interactive features.SuperMap iClient for Leaflet and SuperMap iClient for Cesium are used to load 2D maps and 3D scene data,respectively,and implement functions such as information querying,scene browsing,3D analysis,and entity mapping.These functions can effectively help users quickly obtain the required geographic information data and perform real-time analysis.(4)Developing a BIM and multi-source geospatial data fusion system.Considering the needs of geospatial information in urban areas,the overall architecture and functional modules of the system are designed based on WebGIS technology.The system is based on the B/S(browser/server)architecture,with front-end development using the Vue-cli framework for component-based development.SuperMap iClient JavaScript is employed for map scene data loading.Tomcat and SuperMap iServer serve as system servers,while Oracle functions as the system database.The system ultimately realizes the management,operation,display,and analysis of multi-source geospatial data.After testing,the system can effectively manage the complex and changing geographic information data in urban areas and present the data in a more intuitive way through visualization.The system supports real-time querying of relevant geographic information data,improving urban management efficiency and providing foundational information support for the construction of smart cities. |
