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N the longitudinal outline of a riverbed from source to mouth 河流谷底线 [geography]
The study shows that the technology and method of distilling the thalweg using DEM are practical and effective.
实验结果证明，利用DEM自动提取沟沿线是一种快速、有效的技术方法。
The thalweg in loess hill area is an important terrain structural line, reflecting topography and landform character.
黄土丘陵区的沟沿线，是反映该区地形地貌特征的重要的地形结构线。
Raster DEM grid search method is to obtain the riverbed thalweg through a two-dimensional matrix search with a certain height rules.
栅格DEM搜索法是通过二维高程矩阵按照一定规则进行搜索，获取河床深泓线；
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