等高线群拓扑关系的提取和表示是基于等高线的空间推理和地形特征挖掘的关键。在顾及地形特征的基础上,本文提出了一种拓扑关系网络来组织地理目标之间的拓扑关系,并进而提出分区二叉树、增量等高线树、等高线拓扑关系网三种拓扑关系网络来组织含未封闭等高线的复杂等高线群的拓扑关系,从而从根本上解决了等高线群的侧向不连续性,使基于等高线的空间推理更加简便和准确。

The key of automated reasoning and extraction of terrain features with contour maps is the mining and description of topologic relations among contour lines.This paper suggests the networks of topologic relations(NTR) to describe the topologic relations among geographical objects,and three kinds of NTRs named the binary subdivision tree(BST),the incremental contour tree(ICT) and the networks of topologic relations of contour lines(NTRC) are presented to express the topologic relations among complicated contour groups having unclosed contour lines.These models have ultimately dealt with the lateral uncontinuity of contour lines and make the automated reasoning with contour maps more easily and exactly.