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《Journal of Anhui Agricultural Sciences》 2008-17
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Algorithm Comparison of Slope and Aspect from DEM

LI Fen-ling et al(College of Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100)  
The slope and aspect were extracted by 6 different algorithms based on DEM,which was produced by digitalizing the relief map with map scaled at 1∶10 000.By comparing mean value,maximum value,standard deviation,median error of slope and standard deviation,coefficient of variation,cosine median error and area data of aspects,analyzing the relationship between errors and terrain change,a reasonable algorithm of extracting slope and aspect was found.Furthermore,area errors,change regularity of slope and aspect based on different resolution DEM was analyzed.The indices of the total error of weighted area percentage and total error of average area percentage were used for obtaining the linear relationship between two indices and horizontal resolutions.The study aimed at providing some basis for choosing the approximate horizontal resolutions and it was meaningful for cost saving and decreasing the data amount at the condition of accuracy assuredness.
【CateGory Index】: P208
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