quad tree [计] 象限四分树 ; 四元树 ; 四叉树
quad tree structure 四象限树状结构
quad-tree code 四叉树编码
Quad tree based segmentation 四叉树分割
quad-tree hierarchy 四叉树层次结构
Harmonic Structure Quad Tree 谐波结构四元树音讯压缩演算法
quad tree grid 四叉树网格
tile quad tree 瓦片四叉树
Space quad-tree 体影分离渲染
Aiming at terrain simplification, we advance a rule of model simplification giving attention to both the character of nature and the user-defined properties, which is based on the quad-tree.
针对地形的简化提出了基于四叉树的兼顾自然特征和用户自定义特征的模型简化规则，并巧妙地将三角形二又树与四叉树结合实现对三角化中裂缝的处理。
参考来源 - 3DGIS中大数据量场景可视化研究Exploiting the idea of midpoint-divide and combining the procedure of quad-tree generating, its view-culling is precise and fast.
算法中，视区剪裁采用“中点分割”的思想，结合了四叉树剖分过程，提高了效率。
参考来源 - 期刊学术社区·2,447,543篇论文数据，部分数据来源于NoteExpress
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。
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。
It used a fast-created quad-tree to execute region query, which not only improved the query efficiency, but also shortened the time of constructing a spatial index.
使用快速生成的四叉树进行区域查询，在提高查询效率的同时，有效缩短构造空间索引的时间。
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