基于用地结构熵的广义熵重力模型

Generalized entropy gravity model based on land-use structure entropy

针对重力模型存在区内出行量预测精度较低,以及采用非重力模型的方法单独估计区内出行量会导致与出行分布理论不一致的问题,在借鉴熵函数形式的基础上,考虑出行产生(吸引)量、出行成本和用地混合程度的影响,提出了基于用地结构熵的广义熵重力模型,构建了区内出行和区间出行一致的理论模型。以2008年西安市大规模居民出行调查数据为输入参数进行了应用研究,验证了模型的精度。研究结果表明:所构建模型对区间出行估计精度提高了19.56%,而对区内出行估计精度提高了36.44%;该模型将城市用地规划中的构成要素直接引入交通规划理论结构中,实现了土地利用与城市交通在规划理论和技术上的衔接,提高了交通规划的科学性。

Aimed at the fact that gravity model is low in prediction precision within an area,but other method to estimate separately area trip will lead to the inconsistency with trip distribution theory.To solve the problem,on basis of the entropy function,with consideration of the amount of trip generation/attraction,travel cost and the effect of mixed degree of land use.The generalized entropy gravity model was proposed based on the land-use structure entropy,the purpose of which was to obtain theoretical model between the area trip and interval trip.The theoretical model was verified by the trip survey data of Xi＇an in 2008.The results show that estimation precision with the proposed model of interval trip is improved by 19.56%,and for the area trip,the precision is improved by 36.44%.The model directly introduces elements of urban land planning into traffic planning theory,which leads to connection of theory and technology between land use and urban traffic planning and improves the scientificity of traffic planning.