Automated extraction of shoulder line of valleys based on flow paths from grid Digital Elevation Model （DEM） data
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摘要: 基于数字高程模型（DEM）进行沟缘线的自动提取是黄土丘陵沟壑区进行分布式水文计算与土壤侵蚀建模的关键技术.该文以基于栅格数字高程模型进行河网提取与流域划分技术为基础,基于栅格单元间八流向算法构建水流路径,提出一种基于汇流路径坡度变化特征确定沟坡段,进一步形成封闭沟缘线的新方法,并编程实现了该方法.通过对蔡家川流域1∶10000等高线生成2m数字高程模型,依据35°作为判断沟坡单元的标准,自动生成沟缘线分布图,并与原始坡度分布图比较,取得满意的结果.Abstract: The extraction of a continuous shoulder line of valleys with a precise location is a critical technique in constructing the mechanism-process models of spatial distributionsuch as those for soil erosionsediment transportation and runoff process in gully areas of the Loess Plateau．The extraction technique presented in this paper is based on a hydrological method of river network and catchment boundary extractionutilizing slope variation of a flow path to define the feature segment of slope profile and produce a continuous shoulder line of valleys．In this paperthe authors presented an algorithmby which the drainage network and the continuous shoulder line of valleys were extracted automatically from the DEM of Caijiachuan watershed in Jixian County Shanxi Provincewhich is located in the gully area of the Loess Plateau．The final result agrees with the optical interpretation from slope distribution in the experimental area．
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