自适应显示环境可视化表达的线要素图形化简

Responsively Simplifing Line by Adapting to Display Environment

基于众源、VGI数据的元数据信息缺失以及地图显示环境的多样化,提出一种实时自适应显示窗口大小、分辨率动态化简线要素的方法。该方法采用自适应与尺度变换的策略,根据不同的平台环境和数据表达范围、坐标值分布,自动调整曲线化简的比例尺、控制参量,动态输出适宜的简化表达。试验表明,该方法能够实现自适应显示窗口环境对VGI线要素数据进行动态化简,且具有良好的可视化效果。

Aimed at the lack of meta data of volunteered geographic information and the diversity of map display environment,this paper presents a real-time line-simplifying method adapting to both size and resolution of different display windows.The method which adopts an adaptive and scale transformation strategy,can automatically adjust scale and control factor of line generalization,and dynamically outputs appropriate simplified representation according to platform display,data representation range and coordinate value distribution.Experiments show that this approach not only can responsively simplify VGI lines by adapting to environment display,but also has a good visual effect.