The cell centered finite volume method is used as the spatial discretization method.
空间上应用中心平均的有限体积法进行离散。
The discretization model includes: (1) Urban population spatial discretization model;
离散化模型包括：（1）城镇人口的空间离散化模型；
The spatial discretization method is used to detect the fast collision among moving objects and collision between moving objects and terrain.
为了实现运动物体与地形的匹配，采用了一点匹配法和面匹配法。
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