| 基于不同DEM数据源的数字河网提取对比分析——以韩江流域为例 |
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| 引用本文： | 刘远,周买春,陈芷菁,李绍文.基于不同DEM数据源的数字河网提取对比分析——以韩江流域为例[J].地理科学,2012(9):1112-1118. |
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| 作者姓名： | 刘远 周买春 陈芷菁 李绍文 |
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| 作者单位： | 华南农业大学水利与土木工程学院;广东省水文局;广东省韩江流域管理局 |
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| 基金项目： | 国家自然科学基金(41171029);华南农业大学校长科学基金(7600-K07050);广东省高等学校人才引进专项资金(粤教师[2008]86号);广东省水利科技创新项目(2009-42)资助 |
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| 摘 要： | 基于HYDRO1K、SRTM3和ASTER GDEM三种DEM数据,利用BTOPMC地形子模型提取韩江流域河网,并作对比分析。结果表明:①SRTM3提取的河网精度最高,HYDRO1K相对最低。②DEM的垂直精度对提取的河网精度起控制作用。ASTER GDEM的水平分辨率较高,但垂直精度不如SRTM3,因而提取的河网精度不如SRTM3。③HYDRO1K提取大尺度流域河网具有一定的精度,但在地势平坦区域的效果较差,HY-DRO1K不宜用来提取小尺度流域河网。④由DEM提取的数字河网精度与当地的地面坡度以及处理DEM的填洼算法有关。
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| 关 键 词： | DEM 水平分辨率 数字河网 韩江流域 |
Comparison of Drainage Network Extraction from Different DEM Data Sources:A Case Study of Hanjiang River Basin |
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| LIU Yuan,ZHOU Mai-chun,CHEN Zhi-jing,LI Shao-wen.Comparison of Drainage Network Extraction from Different DEM Data Sources:A Case Study of Hanjiang River Basin[J].Scientia Geographica Sinica,2012(9):1112-1118. |
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| Authors: | LIU Yuan ZHOU Mai-chun CHEN Zhi-jing LI Shao-wen |
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| Institution: | 1.College of Water Conservancy and Civil Engineering,South China Agricultural University,Guangzhou, Guangdong 510642,China;2.Hydrology Bureau of Guangdong Province,Guangzhou,Guangdong 510150,China; 3.Administration Bureau of Hanjiang River Basin of Guangdong Province,Shantou,Guangdong 515041,China) |
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| Abstract: | Based on the three DEMs of HYDRO1K,SRTM3(version 4) and ASTER GDEM,drainage networks of Hanjiang River basin are extracted by using the terrain module of BTOPMC.The comparison shows that: ① the accuracy of drainage networks extracted from SRTM3 is the highest,then that from ASTER GDEM.The accuracy of drainage networks extracted from HYDRO1K are not so good.② The vertical accuracy of DEM controls the accuracy of drainage network extraction.Although the horizontal resolution of ASTER GDEM is high,its vertical accuracy is not so good as SRTM3.Thus,the accuracy of drainage networks extracted from ASTER GDEM is not so good as that from SRTM3,both in whole basin and in sub-basins.③ In large basin,drainage networks extracted from HYDRO1K are reasonable but become bad in low-relief regions.HYDRO1K is unsuitable for drainage network extraction in small-scale basins.④ The accuracy of drainage network extraction from DEM is affected by local terrain slopes and the depression filling algorithm.Compared with Arc Hydro Tools,the terrain module of BTOPMC avoids most parallel channels.Also,the threshold contributing area used for channel sources should be identified by referring to the map scale. |
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| Keywords: | DEM horizontal resolution digital drainage network Hanjiang River basin |
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