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《Science of Surveying and Mapping》 2008-06
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Topographic attributes extraction and analysis based on grid DEM

YUAN Li-feng①,LI Fa-yuan②,ZHANG Hai-tao①(①College of Telcommunication and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;②Key Laboratory of Virtual Geographic Environment,Nanjing Normal University,Nanjing 210046,China)  
Taking Yan'er Gully watershed as a test area and ArcGIS as a test tool,extraction and analysis of topographic attributes based on grid DEMs are discussed in this paper.The spatial and statistical distribution of topographic attributes are computed and compared.It is assumed that a relative real DEM which is consistent with natural land surface can be produced through reconditioning basic material generated DEM and reprocessing DEM.Methodology of Mathematic statistics and comparative analysis are used to analyze effect of DEMs with different grid resolutions on the outcome of topographic terrain extraction,including slope,topographic index(i.e.ln(α/tan β)),watershed and subwatershed area,and drainage network.Analysis results of topographic attributes derived form different grid resolution DEMs indicates that with the decrease of DEM resolution,terrain is smoothing,the mean value of slope decreases,the mean value of ln(α/tanβ) distribution increases,the total area of the watershed increases,the count of subwatersheds decrease,the total length of streams decrease,and the drainage density decreases.
【Fund】: 南京邮电大学“攀登计划”项目(XK0020906075)
【CateGory Index】: P208
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