基于GIS绘制海水污染物分布等值线算法研究

将三角网法应用于海水污染物分布等值线的绘制,并结合海岸线及海洋污染监测站点的分布特点对海水污染物分布等值线的绘制提出了一种新思路,即,在具有强大地图分析功能的ActiveX控——MapObjects图层上绘制海水污染物分布等值线,并将GIS中的图层技术应用到了裁剪海陆相接处等值线的过程中,在保证绘制精度的同时,免去了使用传统计算机图形学裁剪方法所必须进行的大量且复杂的数学计算,提高了绘制速度。

Algorithm for Building Oceanic Pollution Distrubution Isoline Based on the GIS

Combing the method of triangulation web with the process of drawing distribution isoline of the oceanic pollution , and introducing a new view based on the distribution characters of the coastline and oceanic pollution monitor sites , that is taking the advantages of the AcitiveX control - MapObjects ,which has powerful map analysis ability, to draw oceanic pollution distribution isoline on it. At the same time using the technique of maplayer which is included in the GIS into the process of ocean and land's crossing area isoline cutting , which can both guarantee the drawing precision and avoid a mass of and complex mathematical calculation ,which can not be avoided if using the traditional computer graphics cutting method, increase the speed of drawing obviously.