基于规则格网DEM的建模及晕渲方法研究  

Research on modeling and hill shading of regular grid DEM

作　　者：薛志伟[1,2] 王富强[1,3] 马俊[1,4] 曹坤[1,5] 徐永岗 

机构地区：[1]信息工程大学测绘学院 [2]63710部队 [3]78138部队 [4]61363部队 [5]南昌陆军学院

出　　处：《测绘工程》2012年第3期31-34,共4页Engineering of Surveying and Mapping

摘　　要：DEM数据是生成晕渲图的重要数据源。基于对角线剖分法建立地表模型并添加光照是由规则格网DEM生成晕渲图的常规方法。分析数字晕渲中常规建模方法的优缺点,使用基于自由曲面的地表建模方法对常规建模方法的不足进行改进,最终生成的晕渲图整体立体感强,明暗变化柔和。最后,对不同建模方法的适应性进行分析。DEM data is an important data source that generates shaded-relief map. The conventional meth- ods of regular grid DEM in generating shaded-relief map is to use diagonal triangulation method to establish surface model and add lighting. The paper analyzes the advantages and disadvantages of conventional modeling methods in automatic hill-shading, and tries to improve conventional modeling methods by using free-form surface modeling methods so as to generate shaded relief map with strong stereoscopic sensation and soft changes of light. In the end, the paper makes an analysis about the adaptability of different modeling methods.

关 键 词：DEM 数字晕渲 自由曲面 

分 类 号：P208[天文地球—地图制图学与地理信息工程]