| 基于DEM的山地鞍部点分级提取方法 |
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| 引用本文： | 熊礼阳,汤国安,宴实江.基于DEM的山地鞍部点分级提取方法[J].测绘科学,2013,38(2). |
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| 作者姓名： | 熊礼阳 汤国安 宴实江 |
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| 作者单位： | 南京师范大学虚拟地理环境教育部重点实验室,南京,210046 |
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| 基金项目： | 国家自然科学基金重点基金(40930531):基于DEN的黄土高原地貌形态空间格局研究 |
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| 摘 要： | 本文以地形起伏变化较大的陕北黄土丘陵沟壑区为例,通过流域边界线上高程相对低点的自动识别,实现基于DEM数据的地面鞍部点自动获取。实验结果显示,采用该方法所提取的地面鞍部点具有层次结构显著、提取精度高、操作简便、便于确定重要性等级及与山顶点空间关系等优点,对于DEM地形特征点簇的构建与分析具有重要意义。
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| 关 键 词： | DEM 鞍部点 流域边界线 分级提取 |
Grading extraction method of saddles based on DEM |
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| Abstract: | Saddle is the steepest terrain feature point in the evaluation of landform units,which conveys the basic landform morphology and the hierarchical structure.In this paper,a method was designed to extract the saddle points of land reliefs by the notion that saddle points are relatively low points on the watershed boundaries,which were extracted by a carefully designed D8 procedure.The method was validated in a typical geomorphologic area with low hills and dense gullies in the northern Shaanxi Loess Plateau.Experimental result showed that the terrain saddle extracted by this method could inherit the characteristics of high precision,simple extraction,better conveying the hierarchical structure of landforms,and remain the spatial relationship with peaks so as to determine hierarchical levels of the saddles.It is a vital way of constructing the landform characteristic retained terrain feature point clusters. |
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| Keywords: | DEM saddle points water-dividing line grading extraction |
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