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StudyontheAccuracyandAlgorithmsforCalculating

SlopesandAspectsBasedontheDigitalElevationModel

LITian2wen1,　LIUXue2jun1,2,　CHENGZheng2jiang1

(1.DepartmentofUrbanandResourcesSciences,NorthwestUniversity,Xi’an710069,China;

2.CollegeofHighwayEngineering,ChangshaUniversityofScienceandEngineering,Changsha410076,China)

Abstract:Slopeandaspectarethemostfrequentlyusedterrainparametersingeosciencemodels,theycannotonlyindirectlydescribetheshapeandstructureofaterrain,butalsoarethebasicparametersinthehydrologicalmodels,monitoringandanalysisoflandslides,surfacematerialmovement,soilerosionmodels,landuseplan2ning,etc.However,therearesomedifferentviewpointsandevencontradictionsintheaccuracyandalgorithmsofslopeandaspectduetothedifferencesinthesourcesoferrors,analysisandevaluationmethods.Inthispa2

per,theerrorsincalculatingslopesandaspectswithdigitalelevationmodel(DEM)aretheoreticallyanalyzed,andtheconclusionsconcernedareverifiedwiththeexperimentaldatasoastoclarifythecontradictionsincalcu2latingslopesandaspects.ItisconsideredthatthesourcesandcharactersoftheerrorsincalculatingslopesandaspectswithDEMshouldbedifferentiated,andtheevaluationofthealgorithmsshouldbecarriedoutintheob2jectiveandquantitativeenvironmentwiththecomparableobjects.KeyWords:digitalelevationmodel;slope;aspect;algorithm;accuracy.

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