一种改进的基于区间树的等值线提取算法

Computer and Modernization(2011)

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Abstract
从DEM中提取等值线是计算机制图和地理信息系统的基本功能之一。本文提出一种基于区间树索引的等值线提取算法。借鉴在平衡二叉排序树中插入元素的算法来建立区间树结点;在查找等值线经过的网格时,仅对搜索路径上区间树结点的网格队列排序,避免对区间树全部结点的网格队列排序。实验表明,此算法较以往算法在时间上具有优势。
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Key words
interval tree,isoline,AVL tree,DEM
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