Research On Indoor Path Planning And Display Method Based On BIM

In recent years,with the improvement of urban infrastructure and the increase of the coverage of high-rise buildings,people's demand for location information service is becoming more and more urgent.Ministry of science and technology of China has also listed the location based information service technology as the key development direction in 13th Five-Year.As the precondition and foundation of internal path guidance of building,indoor path planning has become the focus of location service research.However,the existing indoor path planning methods mainly focus on building the indoor map by using two-dimensional plane drawing of the building,relying on the traditional path searching algorithm to find the road,lacking of the efficient use of geometry and attribute information of the building itself and the examination of the spatial topological relation of the building,so it is difficult to meet the demand of pathfinding of multi-layer continuous space indoor.Meanwhile,the two dimention expression based on arrow and line drawing also makes the path expression has poor intuitive and interactive.As a new information technology in the field of architecture,BIM technology covers the complete data information from up-front planning and design to construction and operation.It can provide data support and visual display scheme for indoor path planning.In this thesis,the Building information modeling,the Internet 3D display technology and the indoor path planning algorithm are combined to study the indoor path planning and display method based on BIM,and the following research results are obtained:(1)Establish the parameterized path planning model Based on IFC(Industry Foundation Class),and build the indoor basic road network based on Delaunay triangulation.Through the theoretical analysis of IFC standard's mechanism of information description and association,the semantic information classification of model objects and the information extraction of model components facing path planning are completed.The parameterized path planning model is set up,and use the model as the data source,the Delaunay triangulation and model finding node selection of the planning area are carried out to build the basic road network,which lays the foundation for subsequent research on spatial search algorithm.(2)Compare and analyze traditional indoor path planning algorithm and combined with the actual characteristics of the interior space,an indoor path planning algorithm(IPSR)based on spatial relations and the optimal evaluation method of the path are proposed.On the basis of the traditional heuristic A~*search algorithm,inter layer connection elements were used as the middle node of the path finding.Improve the algorithm to realize the cross floor path planning of continuous indoor space,and the optimal path evaluation method is proposed to limit the range of the heuristic function and achieved the acquisition of the shortest and optimal path of the indoor planning on the basis of this reserch.(3)Based on the research of HTML5/WebGL 3D display technology,this thesis optimize the path planning model in detail level,and propose the Web 3D indoor path visualization display method.Through the analysis of IFC model,the development of 3D graphics engine and the research of building information model database,this thsis designed and constructed a BIM indoor path planning system and took the clinic building of the Peking University People's Hospital(Baita temple area)as the application object to realize the planning and generating of the indoor path and the visual display interaction on the Web side.The result of system implementation shows that the indoor path planning and display method based on BIM technology has a certain reference and application value for meeting the demand of the location information service in the building and constructing an indoor and outdoor integrated navigation service platform.