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三维约束重力模型及其应用 被引量:3

Tri-constrained Gravity Model and its Application
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摘要 双约束重力模型对多中心、长距离组团之间的出行分布描述误差较大,因此需要建立一种多条件的约束模型。从最大熵模型理论入手,在产生量与吸引量双约束基础上,新增第3类约束条件。利用总体阻抗约束最大熵模型推导出三维约束重力模型的一般形式,增加了缩放系数,并利用重力式先验概率的最大熵模型对其进行论证。同时,提出了模型参数标定与检验方法。以福州市交通分布模型为例,对长距离出行约束和跨江出行约束进行分析,并分别应用双约束和三维约束重力模型进行计算,结果说明了三维约束重力模型的可操作性和优越性。 The double-constrained gravity model may generate relatively large errors of trip distributions among distantly separated land-use groups of multi-centers. Therefore, there is need to develop a new constrained model under more conditions. In light of the maximum entropy theory, and considering a third constrain in addition to the double constrains of Os and Ds, this paper formulates a general equation of a tri-constrained gravity model by introducing the total impedance entropy-maximizing model with a relaxing factor, and further performs a verification through the priori-probability of the gravity entropy-maximizing model. Meanwhile, the paper presents a methodology to calibrate and validate the model. The paper also reports a demonstrative application in the City of Fuzhou, Fujian Province, with the constrains of long distance trips and cross-river trips tested using the double-constrained and the tri-constrained gravity models, respectively, The results show that the tri-constrained gravity model is more promising in real-world implementation.
作者 陈仁春
出处 《城市交通》 2009年第2期74-80,共7页 Urban Transport of China
关键词 交通规划 交通模型 三维约束重力模型 缩放系数 参数标定 transportation.planning transportation model tri-constrained gravity model relaxing factor parameters calibration
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