浮动车数据路网时空分布特征研究

Research on Time Space Distribution Characteristics of Floating Car Data in Road Network

以出租车作为浮动车数据采集源,针对浮动车数据路网分布的不均衡性,提出覆盖强度和覆盖率2个指标,通过大量样本分析浮动车数据路网分布的时变特征,以及在不同区域、不同通道上的分布特征。结果表明:浮动车数据的路网覆盖强度和覆盖率在一天中具有持久而稳定的高峰时段,在一周的工作日内能够保持稳定;高等级道路在各个时段总是具有更高的覆盖强度和覆盖率,根据浮动车数据计算的路段行程车速与人工实测数据吻合较好;在非高峰时段、非中心区域,以及低等级道路上,浮动车数据的覆盖强度和覆盖率相对不足。

Regarded taxi as the source of floating car data （FCD）, aimed at the disequilibrium of distribution of FCD in road network, two indexes named detecting intensity （DI） and detecting rate （DR） were designed to analyze the distribution characteristics of FCD in different areas and traffic corridors by large sample analysis. The result shows that there are long and steady peak hours for the values of DI and DR during a day. In working days, the values of DI and DR remain stable. The values of DI and DR of urban expressway and arterial roads are higher through the whole day. The travel speeds of expressways and arterial roads calculated by FCD agree well with the travel speeds calculated by artificial survey. DI and DR are poor in non-central areas of the city, access roads and off-peak hours.