基于画家算法的2.5维统计地图符号消隐方法  

A Hidden Method of 2.5-Dimensional Statistical Symbols Based on the Painter's Algorithm

作　　者：张晓楠[1] 张亚军[1] 华一新[1] 赵军喜[1] 张政[1] 

机构地区：[1]信息工程大学,河南郑州450001

出　　处：《测绘科学技术学报》2015年第4期422-426,共5页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金项目(41271450;41471336)

摘　　要：在利用2维符号图元构建2.5维统计地图符号时,图元的绘制顺序会影响其相互之间的压盖关系,不合理的绘制顺序将会导致2.5维地图符号模糊不清、表达无力。因此,必须采取特定的策略合理地安排图元的绘制顺序,以完成符号的顺利绘制。此处通过对画家算法的分析,探讨基于该算法构建2.5维统计地图符号的基本思路,提出基于画家算法的2.5维统计地图符号空间消隐方法,详细阐述轴式消隐、面式消隐、体式消隐和扇式消隐等几种消隐方法,在保证图元完整性表达方面取得了良好的效果。实验结果表明,该方法可以有效地解决符号图元之间因绘制顺序不合理而产生的相互遮挡压盖问题,构建外形精美的2.5维统计地图符号,在一定程度上提高了统计地图的整体显示效果。Primitive drawing orders will affect the shade gland relationship between each other while building 2.5D statistical thematic symbols by using 2D figure primitives, so unreasonable drawing orders will lead to map symbol obscure or insignificant. Therefore, specific strategies must be taken to reasonably arrange primitive drawing orders in order to complete the design of symbols. By means of the analysis on painter＇ s algorithm basic idea, the basic train of thought of 2.5D statistical symbols to be generated was discussed. A kind of space hidden method of 2.5D statistical cartographic symbols based on the painter algorithm was put forward which specifically includesed shaft hidden, surface hidden, asana hidden and fan hidden etc, and then the good effect in integrated express of figure primitives has been made. Experimental results show that the algorithm can effectively solve the mutual shade prob- lem between figure primitives caused by unreasonable drawing orders, then elegant shape of the 2.5D statistic the- matic symbols have been built, and to a certain extent, the overall display effect of statistic thematic map has been improved.

关 键 词：画家算法 2.5维 统计地图 符号 空间消隐 

分 类 号：P208[天文地球—地图制图学与地理信息工程]