| 基于样本容量的浮动车数据路网覆盖能力研究 |
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| 引用本文： | 辛飞飞,陈小鸿,林航飞.基于样本容量的浮动车数据路网覆盖能力研究[J].公路交通科技,2009,26(8). |
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| 作者姓名： | 辛飞飞 陈小鸿 林航飞 |
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| 作者单位： | 同济大学,交通工程系,上海,200092 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 摘 要： | 以出租车作为浮动车数据采集探测车,针对探测车在路网上行驶的不确定性,提出浮动车数据路网覆盖能力的概念,研究覆盖能力与探测车样本量之间的关系.以覆盖强度和覆盖率为指标,采用简单随机抽样方法,研究了在10种样本条件下浮动车数据路网覆盖能力的变化情况,并进行回归分析.结果表明:在不同样本容量下,浮动车数据对各等级路网的覆盖强度和覆盖率均具有相似的时变特征;各等级路网的平均覆盖强度随样本容量线性增长,增长率随道路等级下降而迅速减小,高等级道路具有更高的覆盖强度;各等级路网的覆盖率随样本容量增大呈非线性增长,高等级道路能够更快达到稳定值;用浮动车数据判别高等级道路的交通状态,可适当降低样本容量.
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| 关 键 词： | 交通工程 路网覆盖能力 样本容量 浮动车数据 回归分析 |
Study on Detecting Capability of Floating Car Data in Road Network Based on Sample Size |
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| XIN Feifei,CHEN Xiaohong,LIN Hangfei.Study on Detecting Capability of Floating Car Data in Road Network Based on Sample Size[J].Journal of Highway and Transportation Research and Development,2009,26(8). |
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| Authors: | XIN Feifei CHEN Xiaohong LIN Hangfei |
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| Institution: | Department of Traffic Engineering;Tongji University;Shanghai 200092;China |
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| Abstract: | Taxies were selected as probe cars to collect Floating Car Data(FCD) which can be used to evaluate traffic conditions in road network.In order to study the uncertainty of probe cars when traveling in urban road network,the definition of Detecting Capability(DC) was put forward.The relationship between DC of FCD and probe car sample size was investigated,which can help find reasonable sample size.Two indexes named Detecting Intensity(DI) and Detecting Rate(DR) were designed to analyze the change of DC under ... |
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| Keywords: | traffic engineering detecting capability sample size floating car data regression analysis |
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