The Uncertainty of Slope Spectrum Derived from Grid Digital Elevation Model

Abstract

Slope Spectrum is a new method in geomorphologic research in the Loess Plateau. It can be used to describe not only the spatial variation of loess landform features, but also the rules and the development process of soil erosion in the Loess Plateau. The uncertainty is inherent law of the Slope Spectrum, which directly restricts the application of the Slope Spectrum. The concept and influencing factors of the uncertainty of Slope Spectrum are investigated with the theory and methodology of the geo-information. The Loess Plateau of northern Shaanxi province is taken as a research area. More attentions are paid to the investigation of the key factors affecting the uncertainty of Slope Spectrum, such as scale effect of terrain description based on DEM, classification method, description and modeling and sample area of the slope spectrum. The critical area in which the slope spectrum can exist stably is not only the foundation of extraction corrected slope spectrum, but also the reflection of the comparability of topographic feature between the local and globe.