Research On Spatio-temporal Object Modeling And Visualization Of Traffic Elements Based On High-precision Map Data

With the continuous advancement of the intelligent and networked automobile industry,the highprecision map,which plays an important role in the future intelligent travel,is coming into the public's vision.At present,the high-precision map data studied by major map vendors and Internet companies are high in precision and large in volume,but the scope of use is only limited to the autonomous driving of intelligent cars.If these data can be processed and a unified data model can be built,the use range of high-precision map data can be greatly expanded to meet the needs of more fields,such as traffic management,emergency support and road maintenance.When describing the traffic elements,the existing traffic element data models mainly describe the spatial positions of the traffic elements.The existing models lack the description of complex information such as time,correlation,composition and behavior characteristics of traffic elements.In order to comprehensively,accurately and intuitively express the spatiotemporal dynamic change characteristics of traffic elements and expand the application range of high-precision map data,this paper adopts the concept of pan-spatial information system and multi-granularity spatio-temporal object modeling.Therefore,this paper combined traffic elements with multi-granularity spatio-temporal objects,and carried out related studies on the objective modeling and visual expression of traffic elements based on high-precision map data.The main contents of this paper are as follows:1.The research status of spatiotemporal data model,high-precision map and its data logic structure,and the modeling and visual representation of traffic elements were summarized.The problems existing in the modeling and visualization of high precision traffic elements were analyzed.On this basis,the main research content and the organizational structure of this paper were put forward.2.The concept of objectification of traffic elements was put forward,and the advantages of objectification were analyzed.In view of updating technology and data processing process,the advantages of high-precision traffic factor data management based on multi-granularity spatiotemporal objects were analyzed.Based on the difficulty of the objective description of traffic elements,a model of the objective description of traffic elements was established.The traffic elements were reclassified based on vehicle behavior,and the unique feature items of each object class of traffic elements were described in detail.3.The objective modeling framework of traffic elements was constructed.The objective modeling idea of traffic elements was established.The key techniques in the process of modeling were analyzed.The traffic element object class template was designed.The conversion rules of highprecision map data based on template were studied,and the high-precision map data in batches was converted.Finally,an application example was given to verify the objective modeling of traffic elements.4.The difference between the objective expression of traffic elements and navigation electronic map expression was discussed.The flow,key technical problems and visualization contents of traffic element visualization were put forward.Research on the visual expression technology of traffic elements had been carried out.Based on WebGL,the three-dimensional symbols of traffic element object was constructed,and the visual expression technology considering the rules of road passage was studied.Finally,the visualization function was designed and implemented.5.The framework and each function module of the high-precision traffic element visualization experimental system were designed and implemented.Taking high-precision traffic factor data of Beijing as an example,modeling and visualization experiments were carried out in this paper.The feasibility and applicability of the modeling and visualization method proposed in this paper were verified.