Construction Of Indoor And Outdoor Integrated Road Network Based On BIM And GIS

Intelligent spatial analysis services have always been an important part of smart city construction.People's demand for spatial information has also evolved from traditional outdoor flattening to indoor three-dimensional three-dimensional.Road network construction is a basic research in spatial information analysis research.By constructing an integrated indoor and outdoor road network data model with precise information and complete attributes,it can provide powerful technical support for indoor and outdoor navigation,emergency evacuation and other application services.However,most of the research on indoor and outdoor road networks are independent of each other.The indoor road network is mostly based on the plan,and its information volume is low and its spatial relationship to the floor is poor.Problems such as poor connectivity and data omission often occur in indoor and outdoor connections.In view of the above problems,this paper proposes a method to construct an indoor and outdoor integrated road network integrating BIM(Building Information Modeling)and GIS(Geographic Information System).Constructing an indoor road network by enriching the information of building interior components in the building information model,combined with the GIS road network technology with strong outdoor space analysis,the indoor and outdoor connection scheme is designed to complete the indoor and outdoor integrated road network construction,and the spatial interaction between outdoor and outdoor spatial data is realized.The following research results are obtained:(1)Indoor component information extraction and construction of three indoor road networks.BIM's standardized data exchange file IFC(Industry Foundation Classes)is used as the indoor data source,and the geometric and semantic information in the IFC is extracted,and the contours of the indoor components are extracted in a targeted manner to avoid redundancy.Based on the indoor road network model of node and edge structure,multiple types of special nodes are defined to express the information of indoor spatial relationship.At the same time,the node simplification algorithm is designed to control the accuracy of the model.The longitudinal connection of the multi-layer planar road network model is completed,and the three-dimensional three-dimensional road network model is constructed.In the application,a path optimization algorithm based on classical path finding algorithm is designed to further optimize the planar path.(2)The indoor and outdoor connection points are designed to realize the integrated construction of indoor and outdoor road networks.Analyze the characteristics of GIS technology in the construction of outdoor road network,and design indoor and outdoor connection points.Complete the connection construction of the connection point to the outdoor road network reference point under different conditions.For the difference of indoor and outdoor road network data,the supplementary information of information reference and coordinate conversion between indoor and outdoor connection points is designed to realize the integration of indoor and outdoor road network from spatial position to data structure.(3)Web-based visualization platform development and design Indoor and outdoor path planning system to achieve road network model application.In the experimental application,the system is developed on the open source visualization platform on the webpage,and the indoor and outdoor path planning system with the indoor and outdoor integrated road network model as the data source is designed.The visual display of BIM model combined with GIS scene is realized on the system.The road network model is used as the underlying data.The classical pathfinding algorithm is used to take the starting point and the destination point in the indoor and outdoor environment,and complete the calculation to generate the planning path spanning indoor and outdoor space.The visualization of the path line in the BIM model and the GIS scene is realized,and the practical application of the road network model is verified.