This paper investigates and further studies the EM and IM models for estimating OD matrices from link traffic counts which is a vital subject in urban transport planning. The algorithm and application results are also presented.

• 本文介绍和研究了国际上od阵估计的热门题目,即由路段交通量推算od阵的熵极大(EM)和信息极小(IM)两个模型,算法与应用情况也做了适当介绍。