| 一种基于DEM的河网快速提取算法 |
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| 引用本文： | 黎展荣,陈朝晖,卢苇. 一种基于DEM的河网快速提取算法[J]. 地理与地理信息科学, 2010, 26(1) |
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| 作者姓名： | 黎展荣 陈朝晖 卢苇 |
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| 作者单位： | 南宁市国土资源信息中心,广西,南宁,530021;广西大学计算机与电子信息学院,广西,南宁,530004;南宁市国土资源信息中心,广西,南宁,530021;广西大学化工学院,广西,南宁,530004 |
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| 基金项目： | 广西自然科学基金项目(桂科自0728243) |
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| 摘 要： | 目前从DEM中提取河网应用最普遍的是径向水流算法,但DEM中存在平地会形成平行水流,存在洼地会造成平行水流形成断流。该文提出一种快速提取算法:首先在DEM中标注山顶、平地、洼地和盆地,以山顶区域周围的低洼点为起点,按照最陡坡降追踪谷地,当追踪到盆地区域或其他谷地区域则结束;连接谷地和盆地,建立初步的河流网络。然后计算出网络中连接点的汇水量,舍弃汇水量小的节点的上游谷地,得到需要提取的网络。该算法避免了平行水流和断流的产生,其仅追踪从山顶区域(而非所有格网点)发育的水流,汇水量计算中仅计算连接点(而非所有格网点)的汇水量,实现了河网的快速提取。
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| 关 键 词： | 河网模型 数字高程模型 径向水流算法 |
A Fast Algorithm for Drainage Networks Extraction from Digital Elevation Model |
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| LI Zhan-rong,CHEN Zhao-hui,LU Wei. A Fast Algorithm for Drainage Networks Extraction from Digital Elevation Model[J]. Geography and Geo-Information Science, 2010, 26(1) |
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| Authors: | LI Zhan-rong CHEN Zhao-hui LU Wei |
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| Affiliation: | 1.Naning Land and Resources Information Centre;Nanning 530021;2.School of Computer;Electronics and Information;Guangxi University;Nanning 530004;3.School of Chemistry and Chemical Engineering;China |
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| Abstract: | Flow-routing algorithm is the mostly common algorithm for drainage networks extraction from DEM(Digital Elevation Model),however,if there are flat surfaces in DEM,it would produce parallel flows,and it would broke the river connection because of depressions.In this paper,an improved flow-routing algorithm is proposed,it includes four steps.It scans all the data grids of the landscape and labels the peaks,the depressions and the flats at first;in the second step,it labels the basins by expanding depressions;... |
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| Keywords: | drainage networks digital elevation model flow routing algorithm |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
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