| 摘要: |
| 以陕北延河流域的县南沟小流域为样区,利用1∶5万数字地形图和ANUDEM软件,对黄土丘陵区中等分辨率水文地貌关系正确DEM的建立方法进行研究,并从建立的DEM与基础数据比较、DEM对地形的表现能力分析及水系网络分析3个方面对DEM的质量进行了评价。结果表明,利用ANUDEM和1∶5万地形图插值建立的黄土丘陵区DEM 3个主要参数分别为:分辨率10 m,迭代次数35,第二糙度系数0.7。从建立的DEM上提取的派生等高线与原始等高线符合度高;并且对地形形态的描述和对地貌与水文关系的表现,均更加准确和真实。 |
| 关键词: 数字高程模型 ANUDEM 分辨率 黄土丘陵区 |
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| 基金项目:国家“973”计划项目(2007CB407203);国家“十一五”科技支撑计划项目(2006BAD09B05);黄河水利委员会治黄专项（2004SZ01-04） |
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| The research on generating a hydrologically correct DEM of mesoscale in the loess hilly region |
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| Abstract: |
| The research was conducted to generate a hydrologically correct DEM of Mesoscale in the loess hilly region with the 1∶50 000 digital topographic maps,including contours,spot heights and streams,and the ANUDEM software in Xian Nangou catchment of Yanhe river.The derived contours,the representation of topography and river networks were selected to evaluate the quality of the DEM.Result showed that using digital map and ANUDEM software can generate hydrologically correct DEM of meso scale in the loess hilly region.For generating the DEM,three main parameters of ANUDEM including resolution,iteration number and 2nd roughness,were 10 m,35,and 0.7 respectively.The derived contours and river networks were highly up to the input data.The DEM generated can correctly describe the topography characteristics and the relationship of physiognomy and hydrology. |
| Key words: DEM ANUDEM resolution loess hilly region |
