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《Geo-Information Science》 2007-02
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Analysis of the Slope Uncertainty Derived from DEMs

LIU Min1,2,TANG Gouan1,WANG Chun2,DANG Weiqing3(1 Department of Urban and Resource Sciences,Northwest University,Xi'an 710069,China; 2 Nanjing Normal University, Nanjing 210097,China;3 Institute of Mountain Hazards and Environment(IMHE),CAS,Chengdu 610041,China)  
Slope is one of the crucial terrain variables in spatial analysis and land use planning.DEM based slope extracting method has been widely used in practice.However,the slope data uncertainty which is very important to the applications has always been neglected.This paper focuses on how resolution affects the uncertainty of the slope extracted from DEMs in Shaanxi Province.Taking 1∶50 000 DEM with a resolution of 25m with a total of 671 sheets of Shaanxi as source data.The research shows that the average slope reduction along with the DEM resolution assumes a conic trend,but when the DEM resolution reduces to a certain degree,the average slope would tend to be stable;and from the result of the comparison of the slopes derived from different resolutions,we can see that the slope uncertainty presents an obvious spatial constitutive distribution.
【Fund】: 国家自然科学基金资助项目(40671148).
【CateGory Index】: P28
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