数字地面模型中等高线的自动绘制

Automated portarying of contours in DEM

等高线图在实际工作中应用非常广泛,在数字地面模型的基础上自动生成等高线图有许多算法。在数字地面模型的基础上,着重讨论了四边形格网等高线图的自动生成方法,主要包括等高点的判断、跟踪和连接,为了使等高线跟踪唯一,提出一个新的等高线追踪的判别算法。实践表明在"跟踪—连接"中确定等高线的走向时,不仅可以避免追踪的不确定性,而且简单实用,所述等高线的"判断—跟踪—连接"是正确可行的。

Contour map is quite useful in practice. There is much arithmetic in automated generating contour map based on the Digital Elevation models. In this paper, we focus on discussing a method on the base of DEM, including judging?tracking and linking of the points of same altitude. In order to confirm the contour's uniqueness, the paper introduces a new method of tracking contour. While confirming the direction of contour in the 'tracking-linking' procedure, the method not only is simply and utility, but also can avoid some uncertain result. Practice show that the 'judging-tracking-linking' method describled in the paper is correct and practicable.