A Comparison of Metheods for Computating Slope Length Based on DEM

CAO Long-xi; FU Su-hua

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A Comparison of Metheods for Computating Slope Length Based on DEM

- A Comparison of Metheods for Computating Slope Length Based on DEM
- Bulletin of Soiland Water Conservation Vol. 26, Issue 5, Pages: 58-62(2007)
- 作者机构：
  
  北京师范大学地理学与遥感科学学院,北京,100875
- 作者简介：
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- Published：2007
- 稿件说明：
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CAO Long-xi, FU Su-hua. A Comparison of Metheods for Computating Slope Length Based on DEM[J]. Bulletin of Soiland Water Conservation, 2007, 26(5): 58-62.
DOI：

CAO Long-xi, FU Su-hua. A Comparison of Metheods for Computating Slope Length Based on DEM[J]. Bulletin of Soiland Water Conservation, 2007, 26(5): 58-62. DOI：

摘要

坡长是重要的地形因子

流域坡长的提取有多种方法

国内应用到实际研究中的有基于格网的直接计算法和基于山脊线的快速计算法。以陕西省安塞县大南沟流域5 m分辨率DEM为数据源探讨这两种方法的提取精度。分析可能存在的问题。在ArcGIS 9.0环境中分别用直接计算法和快速计算法进行坡长提取

并与通过地形图量算的坡长进行比较分析。结果表明

直接方法计算结果的合格率为86.9%

与量算值之间的相关系数为0.800

确定性系数为0.520。快速计算法的合格率为69.7%

Abstract

Slope length is an important topographic factor.There are various methods to extract the slope length factor of a watershed. Both of grid based direct calculation method and fast calculation method based on the ridge line have been used in practical research in China. Based on the DEM data of the Danangou wa-tershed in Shaanxi Province

this study attempts to make a comparison of precision for the two methods

and analyze the problems that may exist. Results show that direct calculation method has the eligible ratio of 86.9% and model efficiency of 0.520

whereas fast calculation method has the eligible ratio of 69.7% and model efficiency of-0.150. It can be seen that direct calculation method is superior to fast calculation method. This study can serve the further research work on slope length calculation and other related fields.

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Related Institution

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