CAJ | 학술논문

利用野外获得的离散点数据制作地球化学图，通常采用规则矩形网格化和不规则三角网格化两种方式，前者易出现元素浓集区中心与极值点偏移的现象，后者难以保证等值线圆滑美观，且成图边界不规则。针对上述问题，笔者提出了一种极值无偏的地球化学等值线图生成方法，合并极值点与规则矩形网格点，并剔除畸形网格点，在此基础上构建不规则三角网，而后追踪等值线，通过极值点和规则矩形网格点分别控制等值线图的精度和可视化效果。实验结果证明，采用该方法制作的等值线图，元素浓集中心与极值点位置完全吻合，曲线光滑美观，同时有效解决了扩边问题。
이용야외획득적리산점수거제작지구화학도，통상채용규칙구형망격화화불규칙삼각망격화량충방식，전자역출현원소농집구중심여겁치점편이적현상，후자난이보증등치선원활미관，차성도변계불규칙。침대상술문제，필자제출료일충겁치무편적지구화학등치선도생성방법，합병겁치점여규칙구형망격점，병척제기형망격점，재차기출상구건불규칙삼각망，이후추종등치선，통과겁치점화규칙구형망격점분별공제등치선도적정도화가시화효과。실험결과증명，채용해방법제작적등치선도，원소농집중심여겁치점위치완전문합，곡선광활미관，동시유효해결료확변문제。
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.