The Construction Method Of Building Real Scene Hologram Map

Three dimensional model of real building is an important expression of urban spatial information,which plays an important role in urban planning,construction,management,emergency response,indoor positioning and navigation.However,at present,there are many problems in the construction of real-world model,such as "one skin",fuzzy edge,poor location accuracy,indoor and outdoor separation,which seriously hinder the development of real-world building map based on location service.In recent years,the development of holographic map emphasizes that the ubiquitous information can be correlated,analyzed and expressed on multi-dimensional map with location as the core,which has a broad application prospect.For this reason,based on the technology of semantic classification and texture matching of all building elements,this paper proposes a method of organizing and expressing multi-source and high-dimensional indoor and outdoor data oriented to location service,and constructs a building reality hologram with the characteristics of integration of spatial geometry and semantic information indoor and outdoor.A large number of experiments and empirical research on indoor positioning system show that this method can effectively integrate the multi-source and high-dimensional building spatial geometry data with the real scene multi-source data,and the building real scene hologram has a good practical application effect.The main research structure and results of this paper are as follows:(1)Research on the lightweight method of BIM model for building hologram map.Aiming at building high-precision BIM model and abundant multi-source and high-dimensional data information in indoor and outdoor corresponding scenes,semantic classification organization and data information coupling are carried out from geometric,semantic,image,text,audio,video and other element dimensions and their different scales /levels,and spatial logic of building holographic map elements is constructed by using multi granularity expression idea and spatial database technology Organization system and database physical storage structure.At the same time,we extract the semantic association between building entity elements and the attribute relationship between spatial elements,and build a "element relationship" data model framework to describe the association between elements.Based on the semantic description of different granularity of holographic map elements,the concepts of similarity and granular computing are introduced.Combined with the spatial characteristics of buildings,the information granularity is decomposed and merged,which lays the foundation for the realization of building information organization and matchingusing geocoding technology.(2)Research on reconstruction method of real scene information for building hologram.Building texture plays a very important role in the construction of real 3D model.The quality of texture data organization and expression directly affects the accuracy and visualization of3 D model.First of all,by collecting the texture data of single building indoor close range photography and outdoor UAV tilt photogrammetry data,with the help of image corner detection,extract the contour corner information of building / feature entity,calculate and save the absolute coordinates of texture data,and realize the automatic clipping and correction of indoor and outdoor texture data;in addition,the corrected texture material is used as the language The texture data information of different elements of building entity is obtained by semantic classification and mapping processing,which provides real scene data for the visualization of real 3D hologram map.(3)Research on visualization method of building multi granularity hologram with spatial semantics.In this study,we propose an innovative method to organize and express the multi-dimensional data of geometry and texture,text and audio,video and other all-round elements,which takes into account the spatial semantics.We apply the multi-source and high-dimensional data organization model of indoor and outdoor integration of buildings to the three-dimensional earth space of cesium to realize the single operation of semantic information storage,query and editing of indoor and outdoor integration of buildings In order to realize the location-oriented service-oriented building monomer indoor and outdoor real-world holographic map visualization.(4)Research and demonstration of mobile visualization system of building real-time hologram.By organizing and expressing the all factor data of location-oriented indoor and outdoor integrated real-world holographic map of buildings,a mobile visualization system of multi granularity holographic map of buildings is constructed,and the empirical research of this method is carried out.The system includes the background storage and matching of building geometry,semantics,text,image,audio,video and other elements,as well as data classification and expression,in order to realize the location-based service-oriented building holographic map visualization.Based on this system,this paper effectively completes the multi granularity logical organization and visual expression method system of building space all elements and the demonstration of technological process,which provides a feasible scheme of multi-source high-dimensional spatial data expression for the follow-up research and development work.Based on the spatial semantic association of all element information of building hologram,this paper proposes a multi granularity organization and expression method of multi-source high-dimensional data of building map indoor and outdoor oriented to location service,and realizes the visualization of building indoor and outdoor integrated real-world hologram map.The mobile visualization system of building multi granularity hologram shows that the model not only has the key node sitting information,structural semantic information and real scene information(including the linkage effect of scene visualization and audio-video data),but also effectively realizes the semantic location Association,indoor and outdoor integration and multi-dimensional spatiotemporal expression for the building indoor The external joint application provides rich and refined base map data,and provides a real basic map model for the location-based service related building map application.