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基于偏移四叉树投票的“大尺寸”点状符号多尺度无压盖可视化
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Journal Article
基于偏移四叉树投票的“大尺寸”点状符号多尺度无压盖可视化
2016
Overview
为解决Web 2.0环境下点状符号地图混搭中的制图问题,本文研究并实现了一种可100%避免压盖的＂大尺寸＂点符号高效可视化方法。该方法的核心思想是四叉树网格单选,采用网格平移对多次单选结果投票来计算符号在各缩放级别的显著性等级,可解决符号在相邻网格的空间冲突。该过程不需要显式探测冲突,因而处理效率极高。随着地图放大,重要性较低的符号也逐级显现,实现了语义层次的多尺度表达。针对符号和网格大小比率关系、有效网格平移方案及图面利用率不足问题提出两种扩展：格网增选和多级符号叠加。对方法的可行性进行了试验验证,并分析了该方法在用户查询条件改变下的稳定性和不同数据量下的伸缩性（非优化实现可达到10^5量级数据的亚秒级处理）。
Publisher
Surveying and Mapping Press,武汉大学资源与环境科学学院,湖北 武汉,430079%中国科学院软件研究所计算机科学国家重点实验室,北京,100190%北京大学遥感与地理信息系统研究所,北京,100871
Subject
