| Complex urban traffic has a great impact on people’s travel.Monitor analysis and handling jam of urban traffic is important concern for the transportation department.Nowadays,the technology of GIS is growing,use WebGIS to conduct professional analysis to traffic can help improve traffic jam status.It will be a major trend in the future.The paper combined with existing urban traffic characteristics analysis method and based on the previous analyses methods of spatial autocorrelation and spatial clustering,to expand the analyses methods of spatio-temporal autocorrelation and spatio-temporal clustering,which according to the urban traffic characteristics in Dalian and the needs of the study.The spatio-temporal clustering analysis(ST-DBSCAN)extended from a density-based clustering analysis called DBSCAN.The main idea of ST-DBSCAN is to categorize large data clusters based on similarities,then to divide the spatio-temporal objects with similar traffic status attribute into clusters.The analysis results show as a 3D form that can show spatial and temporal characteristics of road conditions at the same time.Spatio-temporal autocorrelation analysis extended from spatial autocorrelation analysis methods,it’s used for reflecting the similarity of the property values of spatio-temporal neighborhood.Spatio-temporal autocorrelation analysis can be classified as global spatio-temporal Moran’s I,local spatio-temporal Moran’s I and Moran plotting graph,they reflects the correlation characteristics of urban traffic status from different angles.Use Java to extend SuperMap iServer,use SuperMap iObjects to implementation the spatio-temporal clustering analysis and the spatio-temporal autocorrelation analysis algorithms on the server side.Show these operating result and compare the results,summarize the characteristics of urban traffic status in Dalian.Combined the WebGIS and urban traffic status,design and develop the WebGIS system of urban traffic status in Dalian with B/S system development pattern.Display the results of spatio-temporal clustering analysis and the spatio-temporal autocorrelation analysis on the Web side.Use SuperMap iClient for JavaScript and related technology to realize the analysis and statistics functions of urban traffic status,the traffic navigation functions and to show the traffic status.Use ECharts—an open source graph library based on JavaScript to realize a vivid display effect of query results on Web side.The system can provides multi-dimensional and multi-angle professional technical references and good for making appropriate decisions for related departments. |
