网格法追踪等深线的多义性问题研究

A study for ambiguity in tracing depth contour on regular grid

在采用网格法追踪等值线时,如果某个网格四条边上都有等值点,等值点的连接就会出现多义性问题。本文首先介绍了解决网格法追踪等值点中多义性问题的常用方法,针对绘制等深线的特殊要求,分析了这些方法用于追踪等深点的不合理性。为了解决网格法追踪等深线多义性问题,本文提出了追踪等深点的浅点相近方法。通过理论分析和实验,证明本文所提方法解决网格法追踪等深线时的多义性是有效的。

Assume that there is an equivalent node on each side of a grid when using gridding method to draw isoline,how to connect these nodes is ambiguous.Usual algorithms to eliminate the ambiguity in tracing equivalent nodes are introduced.In consideration of the special demands of plotting depth contour,irrationality of the methods for tracing equal depth node is analyzed.To eliminate the ambiguity in drawing depth contour,the method that the following node should thread the side which have shallower depth than another side are proposed.By theoretical analyses and practical applications,the methods suggested in the paper are found to be effective.