三维约束重力模型及其应用

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。

Tri-constrained Gravity Model and its Application

The double-constrained gravity model may generate relative-ly large errors of trip distributions among distantly separated land-use groups of multi-centers.Therefore,there is need to develop a new con-strained model under more conditions.In light of the maximum entropy theory,and considering a third constrain in addition to the double con-strains of Os and Ds,this paper formulates a general equation of a tri-constrained gravity model by introducing the total impedance entro-py-maximizing model with a relaxi...