不同分辨率DEM提取地面坡度的不确定性模拟:以在黄土高原的试验为例

不同分辨率DEM提取地面坡度的不确定性模拟:以在黄土高原的试验为例

Slope is one of the crucial terrain variables in spatial analysis and land use planning,especially in the Loess Plateau area of China which is suffering from serious soil erosion. DEM based slope extracting method has been widely accepted and applied in practice. However slope accuracy derived from this method usually does not match with its popularity. A quantitative simulation to slope data uncertainty is important not only theoretically but also necessarily to applications. This paper focuses on how resolution and terrain complexity impact on the accuracy of mean slope extracted from DEMs of different resolutions in the Loess Plateau of China. Six typical geomorphologic areas are selected as test areas, representing different terrain types from smooth to rough. Their DEMs are produced from digitizing contours of 1:10,000 scale topographic maps. Field survey results show that 5 m should be the most suitable grid size for representing slope in the Loess Plateau area. Comparative and math-simulation methodology was employed for data processing and analysis. A linear correlativity between mean slope and DEM resolution was found at all test areas,but their regression coefficients related closely with the terrain complexity of the test areas. If taking stream channel density to represent terrain complexity, mean slope error could be regressed against DEM resolution (X) and stream channel density (S) at 8 resolution levels and expressed as (0.0015S2+0.031S-0.0325)X-0.0045S2-0.155S+0.1625, with a R2 value of over 0.98. Practical tests also show an effective result of this model in applications. The new development methodology applied in this study should be helpful to similar researches in spatial data uncertainty investigation.

作 者： 汤国安 赵牡丹 李天文 Liu Yongmei ZHANG Ting TANG Guoan ZHAO Mudan LI Tianwen Liu Yongmei ZHANG Ting   作者单位： 汤国安,TANG Guoan(Department of Urban and Resource Science,Northwest University,Xi'an 710069,China;National Laboratory for Information Engineering in Survey,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China)

赵牡丹,Liu Yongmei,ZHAO Mudan,Liu Yongmei(Department of Urban and Resource Science,Northwest University,Xi'an 710069,China;Institute of Soil and Water Conservation,CAS and Ministry of Water Resources,Yangling 712100,China)

李天文,ZHANG Ting,LI Tianwen,ZHANG Ting(Department of Urban and Resource Science,Northwest University,Xi'an 710069,China) 

刊 名： 地理学报(英文版)  ISTIC SCI 英文刊名： JOURNAL OF GEOGRAPHICAL SCIENCES  年，卷(期)： 2003 13(4)  分类号： P283.1  关键词： Loess Plateau   DEM   slope   terrain  

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