基于曲率的小比例尺地貌晕渲图生成方法  

GENERATION METHOD OF SMALL-SCALE RELIEF SHADING BASED ON CURVATURE

作　　者：王少荣[1] 陈星宇[1] 徐秋红[1] 

机构地区：[1]北京林业大学信息学院,北京100083

出　　处：《计算机应用与软件》2015年第7期204-206,271,共4页Computer Applications and Software

基　　金：国家自然科学基金项目(90915010);北京林业大学新进教师科研启动基金项目(BLX2009012)

摘　　要：晕渲法是在平面地图上产生地貌立体效果的主要方法。以DEM(Digital Elevation Model)数据为基础,由计算机自动生成的小比例尺地貌晕渲图,通常有很多干扰的地形细节,影响晕渲图的整体效果。提出一种新的小比例尺地貌晕渲图生成方法,该方法将DEM数据整体滤波后,借助曲率属性提取特征地形并做夸大或加深处理,再利用处理后的数据生成晕渲图。实验表明:该方法有效地移除了破碎的地形细节,同时保护重要的特征地形,生成的晕渲图整体效果很好。Shading algorithm is the main method for generating 3D effects of relief in plane map. The small-scale shaded relief automati- cally generated by the computer based on digital elevation model＇ s data usually has quite a few disturbing topographic details that impair the overall portrayal of shading map. This paper proposes a novel generation method for small-scale relief shading. After the DEM data being fil- tered unitarily, the method extracts the terrain features by means of curvature attribute and further processes with either exaggeration or deepe- ning, and then generates the shading map using the processed DEM data. Experiments have shown that this method effectively removes the broken terrain details while retaining the important terrain features, thus generating a shading map with superb over-all portrayal.

关 键 词：DEM 地貌晕渲 曲率 特征地形 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]