NDLI: Uncertainty of slope length derived from digital elevation models of the Loess Plateau, China

Content Provider	Springer Nature Link
Author	Zhu, Shi jie Tang, Guo an Xiong, Li yang Zhang, Gang
Copyright Year	2014
Abstract	Although many studies have investigated slope gradient uncertainty derived from Digital Elevation Models (DEMs), the research concerning slope length uncertainty is far from mature. This discrepancy affects the availability and accuracy of soil erosion as well as hydrological modeling. This study investigates the formation and distribution of existing errors and uncertainties in slope length derivation based on 5-m resolution DEMs of the Loess Plateau in the middle of China. The slope length accuracy in three different landform areas is examined to analyse algorithm effects. The experiments indicate that the accuracy of the flat test area is lower than that of the rougher areas. The value from the specific contributing area (SCA) method is greater than the cumulative slope length (CSL), and the differences between these two methods arise from the shape of the upslope area. The variation of mean slope length derived from various DEM resolutions and landforms. The slope length accuracy decreases with increasing grid size and terrain complexity at the six test sites. A regression model is built to express the relationship of mean slope length with DEM resolution less than 85 m and terrain complexity represented by gully density. The results support the understanding of the slope length accuracy, thereby aiding in the effective evaluation of the modeling effect of surface process.
Starting Page	1169
Ending Page	1181
Page Count	13
File Format	PDF
ISSN	16726316
Journal	Journal of Mountain Science
Volume Number	11
Issue Number	5
e-ISSN	19930321
Language	English
Publisher	Science Press
Publisher Date	2014-09-18
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Slope length Uncertainty Digital Elevation Models (DEM) Loess terrain Earth Sciences Geography (general) Environment Ecology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Geography, Planning and Development Geology Global and Planetary Change Nature and Landscape Conservation

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