Therefore, the OD matrix estimate and the forecast are necessary.

因此，OD矩阵估计与预测是必要的。

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The paper reviews the current research situation of od estimation, and puts forward the method using floating vehicle to estimate a time_dependent od matrix.

回顾了国内外估算实时OD矩阵现状，提出了用浮动车检测实时OD矩阵的方法。

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