| 数字地貌晕渲的特征增强方法研究 |
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| 引用本文： | 胡丹丹,江文萍,孙二洋,张萍.数字地貌晕渲的特征增强方法研究[J].测绘与空间地理信息,2016(5). |
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| 作者姓名： | 胡丹丹 江文萍 孙二洋 张萍 |
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| 作者单位： | 武汉大学资源与环境科学学院,湖北武汉,430072 |
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| 基金项目： | 国家自然科学基金项目(41371428，41201473)，国家基础科学人才培养基金项目(J1103409) |
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| 摘 要： | 小比例尺DEM制作的晕渲图地形破碎,含有大量的干扰细节,不利于从宏观上把握地形的骨架。为了增强数字地貌晕渲图中的地形特征,本文利用滤波和平面曲率相组合的DEM化简方法来描述山谷和山脊区域。分别针对盆地、平原和山地三种地貌类型,采用90 m、100 m和110 m三种分辨率的DEM数据进行实验,研究发现,这三种地貌类型最佳的山脊夸张系数都为1.3,相应的山谷深化系数分别为0.4、0.6和0.8;而三种分辨率情况下山地的最佳山谷深化系数都为0.8,且山脊的夸张系数都为1.3。
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| 关 键 词： | DEM化简 平面曲率 滤波 地貌晕渲图 |
The Study of Digital Hill-shading Feature Enhancement Method |
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| Abstract: | Shading topography produced by small scale DEM broken , containing details of a large number of interference , is not con-ducive to grasp the terrain skeleton on the whole .In order to enhance digital hill -shading map in the characteristics of the terrain , the article use the combination of filtering and plane curvature to describe valleys and ridges area .Do experiment respectively on three geographical types such as basins , plains, mountains and 90 m,100 m, 110 m three resolution, discover that best ridge exaggerated coefficients of three types are 1.3 and valley deepened coefficient respectively is 0.4, 06. and 0.8, and the coefficients of three reso-lution mountain are the same:valley best deepened coefficient is 0.8 and the ridge coefficient is 1.3.These parameters having some regularity have a great significance for the study of generating enhanced topography hill -shading map . |
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| Keywords: | DEM reduction plane curvature filtering hill-shading map |
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