Aiming at the problem of lack of data model to analyze the level of transportation integration, the paper taking Changsha-Zhuzhou-Xiangtan City Group of China as the research object, based on the Gravity measurement m...Aiming at the problem of lack of data model to analyze the level of transportation integration, the paper taking Changsha-Zhuzhou-Xiangtan City Group of China as the research object, based on the Gravity measurement model, transportation comprehensive distance model, weighted road density model, analysis of Changsha-Zhuzhou-Xiangtan City Group accessibility and transportation integration level. A new method to measure the level of traffic integration is proposed and verified by the road network data and socio-economic data of Changsha-Zhuzhou-Xiangtan City Group. The results show that: Changsha-Zhuzhou-Xiangtan City Group traffic accessibility was “point to surface” shape distribution, taking the core region of Changsha as the optimal, Xiangtan, Zhuzhou, Changsha County next, in remote Yanling County, Chaling county has the lowest accessibility;the correlation between traffic network connection degree and economic connection degree reached 0.871, indicating that the transportation integration level of urban agglomerations has a high degree of fit with the level of economic integration. The research results on the one hand for the Chang-Zhuzhou-Xiangtan urban agglomeration traffic present situation to make an annotation;on the other hand, that provide a reference for further optimization of Changsha-Zhuzhou-Xiangtan urban agglomeration traffic planning.展开更多
为分析城镇土地利用及路网形态对过境公路交通事故的影响程度,以北方某市G503、G302、G334、G203、S514等5条公路沿线的33个城镇为研究对象,通过对城镇路网建模获取拓扑特征参数,采用兴趣点(point of interest,POI)计算土地利用强度与...为分析城镇土地利用及路网形态对过境公路交通事故的影响程度,以北方某市G503、G302、G334、G203、S514等5条公路沿线的33个城镇为研究对象,通过对城镇路网建模获取拓扑特征参数,采用兴趣点(point of interest,POI)计算土地利用强度与土地混合利用程度,采用随机森林模型分析自变量对过境公路交通事故的影响程度,并通过负二项回归分析自变量与过境公路交通事故的相关性。结果表明:随机森林模型中的城镇POI数、过境公路介数中心性、过境公路节度、城镇节点数、土地混合利用程度的特征权重分别为0.62、0.14、0.11、0.07、0.06,城镇POI数对过境公路交通事故的影响最大,过境公路介数中心性与节点数对过境公路交通事故有一定影响,城镇节点数、土地混合利用程度对过境公路交通事故的影响较弱;在负二项回归方法下,过境公路介数中心性、城镇POI数与过境公路交通事故显著正相关,城镇节点数、过境公路节度和土地混合利用程度与过境公路交通事故的相关性不显著。随机森林模型结论与负二项回归分析结论接近,随机森林模型对自变量的非加和性与非线性特点适应较好,适用于交通事故致因分析。控制城镇规模、合理规划城镇路网对减少过境公路交通事故风险和提高交通安全有重要意义。展开更多
文摘Aiming at the problem of lack of data model to analyze the level of transportation integration, the paper taking Changsha-Zhuzhou-Xiangtan City Group of China as the research object, based on the Gravity measurement model, transportation comprehensive distance model, weighted road density model, analysis of Changsha-Zhuzhou-Xiangtan City Group accessibility and transportation integration level. A new method to measure the level of traffic integration is proposed and verified by the road network data and socio-economic data of Changsha-Zhuzhou-Xiangtan City Group. The results show that: Changsha-Zhuzhou-Xiangtan City Group traffic accessibility was “point to surface” shape distribution, taking the core region of Changsha as the optimal, Xiangtan, Zhuzhou, Changsha County next, in remote Yanling County, Chaling county has the lowest accessibility;the correlation between traffic network connection degree and economic connection degree reached 0.871, indicating that the transportation integration level of urban agglomerations has a high degree of fit with the level of economic integration. The research results on the one hand for the Chang-Zhuzhou-Xiangtan urban agglomeration traffic present situation to make an annotation;on the other hand, that provide a reference for further optimization of Changsha-Zhuzhou-Xiangtan urban agglomeration traffic planning.
文摘为分析城镇土地利用及路网形态对过境公路交通事故的影响程度,以北方某市G503、G302、G334、G203、S514等5条公路沿线的33个城镇为研究对象,通过对城镇路网建模获取拓扑特征参数,采用兴趣点(point of interest,POI)计算土地利用强度与土地混合利用程度,采用随机森林模型分析自变量对过境公路交通事故的影响程度,并通过负二项回归分析自变量与过境公路交通事故的相关性。结果表明:随机森林模型中的城镇POI数、过境公路介数中心性、过境公路节度、城镇节点数、土地混合利用程度的特征权重分别为0.62、0.14、0.11、0.07、0.06,城镇POI数对过境公路交通事故的影响最大,过境公路介数中心性与节点数对过境公路交通事故有一定影响,城镇节点数、土地混合利用程度对过境公路交通事故的影响较弱;在负二项回归方法下,过境公路介数中心性、城镇POI数与过境公路交通事故显著正相关,城镇节点数、过境公路节度和土地混合利用程度与过境公路交通事故的相关性不显著。随机森林模型结论与负二项回归分析结论接近,随机森林模型对自变量的非加和性与非线性特点适应较好,适用于交通事故致因分析。控制城镇规模、合理规划城镇路网对减少过境公路交通事故风险和提高交通安全有重要意义。
