【摘要】 在传统电子地图中,注记位置是固定不变的,当在有限的屏幕内放大、平移等动态浏览地图时,很容易使当前屏幕内的一些要素的注记全部或者部分落到屏幕外,不利于表达地理要素,甚至引起表达的错误。文章从点、线、面三类要素着手,提出适合屏幕浏览的自适应注记:无论在当前屏幕怎样移动,对于能看到的地理要素,只要大小足够注记,系统都能调整这些要素的注记位置,使注记呈现在屏幕内,达到良好的地图表达效果。更多还原

【Abstract】 Label positions are fixed in a traditional electronic map.When the map is zoomed in or moved within a lim-ited screen,the labels of map elements can be out of screen completely or in part though the map elements themselves are in the boundary.This is undesirable for the expression of geographic elements and makes unclear expression.This paper proposes a self-adaptive labelling method for point ,line and area elements to the following effect.For those ele-ments visible in the current window,the system can adjust the positions of their labels and show the labels in the cur-rent screen with a good visual expression.更多还原