有序标记与气象等值线的自动填充和隐藏  

Identification method in automatic filling and hiding of contours

作　　者：冯建设[1] 薛晓萍[1] 李鸿怡[1] 陈辰[1] 张继波[1] 

机构地区：[1]山东省气候中心,山东济南250031

出　　处：《海洋气象学报》2018年第1期82-90,共9页Journal of Marine Meteorology

基　　金：公益性行业(气象)科研专项(GYHY201306039)

摘　　要：气象要素等值线分析是气象业务与服务不可或缺的手段,依据等值线自动填充的色斑图广泛应用于各类气象要素场的空间分析。等值线自动填充最关键的环节是确定区域属性值和排序,不可避免地要进行格点与区域、区域与区域之间的包含关系判别,通常需要反复遍历格点数组和创建临时区域,占用内存较多,影响运行效率。文中基于有序标记,巧妙地运用位置关系替代传统的包含关系判别,显著降低了区域属性值确定与排序的难度和复杂度。对于离散的气象要素场,密集的等值线不仅没有实际意义,而且影响空间分布的直观效果,文中基于同一网格边上等值点的有序标记,提出一种自动隐藏部分密集等值线的方法,有效改善了离散场空间分布特征的直观效果。Contour analysis of meteorological factors is the indispensable tool for meteorological service,and the color map based on automatic filling of contours was widely used in the spatial analysis of meteorological element field. The most critical step of isolines color filling is determining the attributes of the regions and sorting. Generally,it was needed to judge the inclusion relation between grid points and regions,regions and regions. As its complexity,this method would occupy a large amount of RAM,and it would affect the computational efficiency. This paper presents a method to replace the traditional judgment of inclusion relation as positional relation judgment which can effectively simplify the contours color-filling with reduced difficulties and complexities. For the discrete data,dense isolines between two neighboring points have no practical significance,and they would affect the visual effect of spatial distribution. Based on the orderly marking of equivalent points on the same grid side,a method to automatically hiding partial isolines is proposed in this paper. It would effectively improve the visual effect of spatial distribution of dispersed field.

关 键 词：三角网格 等值线 多边形 区域填充 包含关系 自动隐藏 

分 类 号：P455[天文地球—大气科学及气象学]