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[1]GUO Weiling,FAN Yu,YANG Qinke.Statistical Distribution of Slope Length Derived from DEM With Different Spatial Resolutions[J].Research of Soil and Water Conservation,2019,26(03):72-76,85.

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Statistical Distribution of Slope Length Derived from DEM With Different Spatial Resolutions

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 03 Page number: 72-76,85 Column: Public date: 2019-04-12

Title:: Statistical Distribution of Slope Length Derived from DEM With Different Spatial Resolutions

Author(s):: GUO Weiling¹, FAN Yu¹, YANG Qinke²; 1. School of Geomatics, Anhui University of Science and Technology, Huainan, Anhui 232001, China;
2. College of Urban and Environmental Sciences, Northwest University, Xi’an 710127, China

Keywords:: slope length; DEM; spatial resolution; empirical formula of error

CLC:: P283.1;S157

DOI:: -

Abstract:: Slope length is an important terrain factor in the research of soil erosion and watershed hydrology, etc. In the research of soil erosion assessment at watershed or regional scale, slope length is normally extracted from coarser resolution DEMs. However, slope length tends to increase as resolution becomes coarser, which makes the accuracy of hydrology and soil erosion model declined. At present, effects of DEM resolution on slope length has been received attention, but the mechanism for these effects is unclear. Based on this, we used the method of grading the surface of slope length to analyze the statistical distribution of slope length changes with DEM spatial resolution. The results showed that with the resolution decreasing the slope length classification surface presented different trends, the overall performance was that the short slope length grade expanded to the medium grade area, the high grade slope length appeared attenuating and the slope length centrally distributed in the medium grade area. Based on this, the quantitative expression of the slope length surface changes caused by the resolution reduction was proposed. The formula and the empirical formula of slope length error may calculate the appropriate resolution parameters according to the requirement of the slope length extraction precision, and provide the basis for selecting the appropriate DEM resolution to improve the calculation efficiency.

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