等高线整体综合方法研究

Technology and Applicational Research of Contours’ Holistic Generalization

等高线制图综合因其关系复杂,处理难度大,现有软件的等高线综合手段实用化水平不高、效果不理想,本文提出一种等高线整体综合方法:根据谷地的主次关系,从整体上控制谷地的逐步综合。该方法研究了基于特征线层次关系的综合算法,合理控制等高线谷地的综合次序,通过依次选取次要特征线删除谷地,实现了等高线渐次综合,满足了等高线制图综合要求,能够较好地保持地貌基本形态特征,同时兼顾了等高线间的协调性,较好弥补了现有GIS软件在地貌综合方面的不足,适合等高线快速综合处理与编辑。

Contours generalization is a key task of the geography information’s comprehensive approach,but there are many difficulties with existing tools, such as it cannot maintain the basic morpho-logical characteristics of topography, and also cannot take into account the harmonization be-tween the contour lines. This paper puts forward a technology of contours’ holistic generalization that gradually eliminates valleys based on the hierarchical level of the terrain feature lines and can control the generalization in the mass. The method of synthesis algorithm based on the relationship between the characteristic line levels, reasonably selects lower-grade characteristic line for valley generalization. It can goodly maintain the basic characteristics of topography, consider the harmonization between the contour lines, and be fit for quickly contours generalization.