| 黄土丘陵沟壑第三副区水文地貌关系正确DEM的建立与评价 |
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| 引用本文： | 胡志瑞,杨勤科,任宗萍,刘建飞.黄土丘陵沟壑第三副区水文地貌关系正确DEM的建立与评价[J].测绘科学,2009,34(6). |
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| 作者姓名： | 胡志瑞 杨勤科 任宗萍 刘建飞 |
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| 作者单位： | 1. 西北农林科技大学资源环境学院,陕西,杨凌,712100
2. 西北大学城市与资源学系,西安,710069 |
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| 基金项目： | 黄委会天水水土保持实验站项目，国家重点基础研究发展规划(973计划) |
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| 摘 要： | 本文以黄土丘陵沟壑第三副区的藉河流域为研究区,利用ANUDEM软件和1:5万地形图研究了水文地貌关系正确DEM的建立方法,从派生等高线与原始数字化等高线对比等方面对建立的DEM进行了质量评价。并且与传统TIN方法建立的不同水平分辨率的DEM做了比较。结果表明:由等高线、高程点、河流和陡崖线在ANUDEM5.1中生成的DEM质量优于由等高线、高程点和地形特征点用TIN方法生成的DEM。ANUDEM建立的DEM更能精确地反映水文地貌特征。在此基础上,研究了确定集水面积阈值的方法,通过在Arc/Info环境下运行AML程序自动提取了基于水文地貌关系正确DEM的流域特征。
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| 关 键 词： | 水文地貌关系正确DEM ANUDEM 集水面积阈值 河网提取 |
Generate and evaluate hydrologically correct DEMs in loess hill and gully area Ⅲ |
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| HU Zhi-rui,YANG Qin-ke,REN Zong-ping,LIU Jian-fei.Generate and evaluate hydrologically correct DEMs in loess hill and gully area Ⅲ[J].Science of Surveying and Mapping,2009,34(6). |
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| Authors: | HU Zhi-rui YANG Qin-ke REN Zong-ping LIU Jian-fei |
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| Abstract: | Research was conducted to generate hydrologically correct DEMs in Xi river basin with 1∶ 50 000 topographic maps and ANUDEM software. The cross validation, the derived contours, the frequency of slope and channel networks were selected to evaluate the quality of the DEMs. The results showed that using ANUDEM software can generate hydrologically correct DEMs and which is better than using TIN method. ANUDEM-based DEM can reflect topographic feature precisely. The authors studied the determination of drainage area threshold. By running AML program, watershed feature was extracted automatically. |
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| Keywords: | ANUDEM hydrologically correct DEMs ANUDEM drainage area threshold channel network extraction |
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