物探与化探Issue(3)：610-614,5.DOI:10.11720/wtyht.2015.3.30
一种极值无偏的地球化学等值线图生成方法
A contour generating algorithm for solving excursion of geochemical concentration focus
摘要
Abstract
Grid and TIN are usually used during the computer graphics of medium⁃large scale geochemical contour maps; nevertheless, the former generates the problem of " excursion of geochemical concentration focus" , while the latter can't ensure smooth contours as well as regular border. Aimed at solving these problems, this paper presents a contour generating algorithm for discrete data based on extreme points constraint. Firstly, the original sampling points and grid points are merged. Secondly, the abnormal grid points are rejec⁃ted. Finally, triangulated irregular networks and track contour lines are built. The original sampling points and grid points are merged to improve accuracy and visualization of contour lines. The experimental results show that geochemical concentration focus coincides with extreme points in the contour map generated by this method, which is visually smooth and edge⁃expanded.关键词
浓集中心偏移/极值点提取/畸形网格点剔除/地球化学图件Key words
excursion of geochemical concentration focus/extreme points extraction/rejection of abnormal grid points/geochemical map分类
天文与地球科学引用本文复制引用
任泽,刘修国,张剑波,高艳芳..一种极值无偏的地球化学等值线图生成方法[J].物探与化探,2015,(3):610-614,5.基金项目
中国地质调查局地质调查工作项目（12120113026700）；国家自然科学基金项目（41001225）；长江三角洲重点地区三维地质调查项目 （）
