Integration Of Integrated 3D Scene Model And Study Of Single Information Addition Method

With the introduction of the intelligent city and the development of the three-dimensional geographic information system,people have put forward higher requirements for the display and application of the three-dimensional scene of the city.In traditional methods for constructing urban three-dimensional scenes,the construction efficiency of all-monotonic model scenes based on topographic map data is relatively low,and scene construction of integrated models cannot highlight prominent buildings.The urban 3D scene constructed by integrating the urban integration model and the monomer model can display the urban terrain and objects comprehensively and accurately,and improve the efficiency of the urban 3D scene construction.In the process of constructing three-dimensional urban scenes with multi-source data fusion,there are some urgent problems to be solved,such as automatic integration of urban integration model and massive monomer model,and the addition of monomer information in integrated model.The following studies are conducted on these issues:(1)The construction method and comparative analysis of the three dimensional scene of the city.This paper introduces the classification and construction of the main three-dimensional modeling objects in cities,and the three-dimensional scene construction methods commonly used in cities,compares and analyzes according to the characteristics,points out some problems in construction of city 3D scene integration model,such as only as a 3D map browsing and not separate select query of attribute information,the 3D model can not be deleted add and edit operation,points out some problems in the city 3D scene constructed by integration model,such as only as a 3D map browsing and not separate select query of attribute information,the 3D model can not be deleted add and edit operation.(2)Research on the fast embedding method of the bulk monomer fine mold in the integrated three-dimensional model.According to the characteristics of the integrated model,using building vector contour data frame to select the buildings thatneed to be replaced with individual fine models,and according to the height of the vector plane in the data,modify the height of the selected buildings in batches in order to make them close to the surrounding terrain,and insert the massive fine monomer models into the integrated 3D model data,so as to realize the automatic and accurate fusion of the models.(3)The study of the adding method of the monomer information in the integrated three-dimensional scene.This paper elaborates the main method of adding the single information of the integrated model and makes a comparative analysis,and puts forward the information adding method based on the maximum surrounding contour of the building.It uses the building vector contour data,select the appropriate buffer distance,establishes the maximum contour of building,according to it to calculate the maximum height of buildings on the corresponding integration model.Based on elevation data and the maximum contour of building,we establish corresponding transparent bounding boxes,add attributes information to bounding boxes,and so on,we can get similar results to that of the monomer model selected.when selecting a building in the integrated model.Through secondary development,we realize the above two kinds of research methods,and carries on the experiment test in three-dimensional geographic information platform,proved its feasibility,but the operation speed of the program still needs to be improved,and we can further explore the automatic building method of general building model.