The object motion was represented using hierarchical data structure of quad tree.
采用四叉树的层次数据结构来表示物体运动。
Each node represents one DEM data block. According this separation, by quad-tree data structure can get global different resolution DEM data storage architecture.
每个结点表示一个DEM数据分块，根据如此剖分，由这棵四叉树结构就得到全球范围不同分辨率的DEM数据存储结构。
The generation algorithm of adaptive mesh which is based on the quad-tree data structure is presented.
以四分树为数据结构，建立了网格细分法生成自适应网格算法。
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