中文摘要：

以百度地图及高德地图的实时路况系统为研究对象,以上海市闵行区吴泾镇为研究区域进行数据采集,并以出租车轨迹数据和实地拍摄的视频为数据源,用交通流理论中车流量、车流密度和车速作为参数来评估实际交通是否拥堵,并引入级别差参数来描述不同路况系统之间的准确性差异.结果表明：从时间上来看,3种级别差的情况是＂百度-实际＂〉＂高德-实际＂〉＂百度-高德＂;但在空间上,3种级别差情况有一定的差别,原因在于道路属性的不同和周边环境的差异.

英文摘要：

Taking the real-time road status systems of Baidu map and Gaode map as the object of study,selecting Wujing town of Minhang district in Shanghai as study area to collect data,the actual traffic congestion is assessed based on taxi trajectory data,video data taken on-the-spot and the traffic volume,traffic density and speed parameters of the traffic flow theory,and the level deviation parameter is introduced to describe the accuracy difference between road status systems.The result shows that the level deviation between systems is ＂ Baidu-Reality＂ ＂ GaodeReality＂ ＂ Baidu-Gaode＂ in time aspect,while there are differences between systems in space aspect because of the various road attribute and surroundings.