离散化模型包括：（1）城镇人口的空间离散化模型；
The discretization model includes: (1) Urban population spatial discretization model;
这种方法基于任意几何形状网格的抽样定理，利用六边形网格来实现空间离散化。
In the H-FDTD method, Hegxagon grid is used for the spatial discretization by virtue of peridodical sampling theorem based on arbitrary geometry.
本文提出了类条件概率密度随机变量（特征）空间离散化及类条件概率分布估计方法。
A discrete method for stochastic variable (features) space of class-conditional-probability density and estimation method for class-conditional -probability distribution is proposed.
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