晕线地图的自动绘制

Automatic Map Shading

随着专题地图的广泛应用,晕线地图起着越来越重要的作用。晕线地图是以不同的晕线图形填绘在不同的区域范围内,以表示专门现象的类型或数量差异。晕线地图的自动绘制是在计算机软硬件支持下,图形信息自动输出的一种重要形式,同时也是地理信息系统终端输出的重要组成部分。决定晕线图形类型的参数有4个,即晕线的方向、密度。

This paper present the arismetic design of automatic map shading.It gives a new method to identify whether shading line and marginal line intersect. As for singular intersecting point management, it was solved using XXj minus a differential value.Therefore this has not only improved automatic level but also solved the question of than two intersecting points.