摘要
本文介绍了一种简单实用的基于规则格网数据绘制高质量等值线图形的方法。在该方法的关键过程(等值线追踪过程)中,提出栅格右关联标志的概念,并据此确定初始追踪段;追踪过程中依据邻域栅格值的组合特征确定后续点的走向,设计了避免等值线交叉的处理措施;为获得高质量的等值线图形,采用线性插值方法,得到准确定位和视觉效果较好的等值线图形。文中还介绍了编程实现的方法和技巧,关键算法的程序代码非常简洁,易于实现。
This paper introduces a simple but practical method to create high-quality contour line for grid data.In the key step of this method(the process of contour tracking),the paper puts forward the concept of grid right-correlation flag to determine the initial segment of tracking curve.In the tracking procedure,the trend of subsequent points are determined by the combinatorial values of neighborhood cells,and a method is designed to avoid contours crossing.In order to obtain high-quality contour line,it adopts the linear interpolative method to show a contour chart of accurate localization and better visual effect.This paper also introduces the implementation tips with program languages,the presented codes are very laconic and easy to realize.
出处
《测绘科学》
CSCD
北大核心
2007年第6期88-90,共3页
Science of Surveying and Mapping
基金
国家自然科学基金(40401046)
关键词
栅格数据
等值线
后继点追踪
等值点内插
raster data
contour
subsequence point tracing
isometric points interpolating
