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投稿时间：2005-08-24 修订日期：2005-12-15
投稿时间：2005-08-24 修订日期：2005-12-15
中文摘要: 介绍用规则四方矩阵网格资料绘制等值线,实现天气形势检索的思路方法。一是利用成图规则构造顶点绘制不规则点的平滑曲线;二是采用“三象限扫描法”追踪网格各等值点。结果与手绘图一致,线条流畅、准确,响应较快,对于开发自己的软件工具有一定的借鉴意义。
中文关键词: 等值线，B样条三次曲线，三象限扫描法，等值点追踪
Abstract:To realize searching synoptic situations, a method of drawing contours is introduced, which is based on grid data of regular square matrix. Firstly, controlling points are added according to plotting rule and irregular points linked with smooth curve. Secondly, to catch equivalent points, the method of scanning in three quadrants is put forward. The result is similar to the handmade, the lines are proper and smooth, the procedure responds quickly, and there are certain reference meanings for making our own software.
keywords: contour, B-spline cubic curve, method of scanning in three quadrants, catching equivalent points
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引用文本：
张蔺廉,范其平,2006.用规则四方矩阵网格资料分析等值线的一种方法[J].气象,32(6):75-78.
,2006.A Method of Using Grid Data of Regular Square Matrix to Realize Drawing Contours[J].Meteor Mon,32(6):75-78.
张蔺廉,范其平,2006.用规则四方矩阵网格资料分析等值线的一种方法[J].气象,32(6):75-78.
,2006.A Method of Using Grid Data of Regular Square Matrix to Realize Drawing Contours[J].Meteor Mon,32(6):75-78.