Design And Implementation Of Vehicle Trajectory Data Processing And Visual Analysis Platform

Trajectory data represent the behaviors of drivers,and also reflect the urban development and traffic conditions.In recent years,they have been continuously used in related research.However,the trajectory data require complex data processing work,and also contain a large number of visual analysis requirements.It slows down the productivity of relevant research developers and disperses resources.This thesis summarizes the methods and experiences in trajectory data processing,analyzes the realization principle of existing visualization components,designs and implements a platform that provides online data processing and visual analysis functions.The specific research content of this thesis mainly includes the following aspects:1.Trajectory data processing.According to the actual data,this thesis implements data processing methods based on Dask,including data cleaning,stop point extraction and map matching.It improves the data processing efficiency and makes the trajectory closer to reality.2.Trajectory information visualization component.Some existing visualization components cannot guarantee the efficiency and visualization effects when the amount of data increases and operations are frequent.Therefore,this thesis designs and implements a visualization component based on D3.js.By one-time rendering and batch updating,the visualization component reduces the redrawing operation caused by map events,and improves the visualization experience.3.Design and implementation of trajectory data processing and visualization platform.Combining the above works,this thesis designs and implements a Web application that is capable of online data processing and custom visualization.Relevant researchers can process trajectory data in batches and intuitively obtain the required visualization content in the form of file input,so as to meet the needs of researchers to simplify the processing process and intuitively observe the trajectory.Finally,based on the trajectory data of a city in Shandong,this thesis implements a traffic flow visualization system.The online trajectory data processing is carried out through this platform.And the trajectory information visualization component of this thesis is used to realize the front-end page.The processing time of vehicle trajectory data is greatly shortened,the visualization page is rich in functions and styles,the development process is efficient,and the system is highly maintainable.