李精忠, 艾廷华, 柯舒. DEM提取谷地线的有效汇水量阈值范围[J]. 武汉大学学报 ( 信息科学版), 2012, 37(10): 1244-1247.
引用本文: 李精忠, 艾廷华, 柯舒. DEM提取谷地线的有效汇水量阈值范围[J]. 武汉大学学报 ( 信息科学版), 2012, 37(10): 1244-1247.
LI Jingzhong, AI Tinghua, Ke Shu. Effective Flow Accumulation Threshold of Extracting Valley-line from Grid-based Digital Elevation Model[J]. Geomatics and Information Science of Wuhan University, 2012, 37(10): 1244-1247.
Citation: LI Jingzhong, AI Tinghua, Ke Shu. Effective Flow Accumulation Threshold of Extracting Valley-line from Grid-based Digital Elevation Model[J]. Geomatics and Information Science of Wuhan University, 2012, 37(10): 1244-1247.

DEM提取谷地线的有效汇水量阈值范围

Effective Flow Accumulation Threshold of Extracting Valley-line from Grid-based Digital Elevation Model

  • 摘要: 基于地表径流的自然特性从DEM提取谷地线,使用的一个关键参量是汇水量阈值,目前该阈值的选择具有很大的主观性和随机性,没有一个定量的确定模型。从谷地系统自身的相似性特征出发,研究了多尺度条件下汇水量阈值与谷地线平均分叉比的关系,基于自相似性和平均分叉比趋近常数的原理确定了有效的汇水量阈值区间。

     

    Abstract: Most algorithms of valley-line extraction from Grid-DEM are based on the natural characteristics of surface runoff.A key parameter of these methods is the threshold of flow accumulation.At present the choice of the threshold is usually subjective and random,not based on a quantitative model.In this paper,we study the relationship of flow accumulation with the average bifurcation ratio of valley-line network in the context of multi-scale based on the self-similarity of the valley system.The effective threshold range is determined based on the principle of self-similarity and the average bifurcation ratio closer to constant.

     

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