基于DEM提取坡谱信息的不确定性  

The Uncertainty of Slope Spectrum Derived from Grid Digital Elevation Model

作　　者：王春[1] 汤国安[1] 李发源[1] 朱雪坚[1] 贾旖旎[1] 

机构地区：[1]南京师范大学地理虚拟环境教育部重点实验室

出　　处：《地球信息科学》2008年第4期539-544,共6页Geo-information Science

基　　金：国家自然科学基金(40671148);江苏省普通高校研究生科研创新计划项目(CX07B_040z)

摘　　要：坡谱是黄土高原地学分析新方法、新思路的探索。本文基于坡谱不确定性的概念及其过程分布模型的论述,以陕北黄土高原国家1∶10000和1∶50000DEM数据为基本信息源,分析了坡谱不确定性的产生原因、主要影响因素与影响规律,阐述了坡谱提取与应用中应注意的主要问题,为正确应用坡谱进行地学分析提供重要依据。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.

关 键 词：DEM 坡谱 坡度 黄土 不确定性 

分 类 号：P931.6[天文地球—自然地理学]