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《Bulletin of Soil and Water Conservation》 2016-03
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A Study on Optimal Statistical Unit for Relief Amplitude of Land Surface in Shaanxi Province

CHEN Xuexiong;ZHANG Xiaojun;CHANG Qingrui;College of Resources and Environment,Shanxi Agricultural University;College of Horticulture,Shanxi Agricultural University;College of Natural Resources and Environment,Northwest A&F University;  
[Objective]To determine the optimal statistical unit,analyze the spatial distribution of topographical relief in Shaanxi Province in order to provide basic data for the classification of geomorphic types.[Methods]Based on the 90 mresolution SRTM(shuttle radar topography mission),DEM(digital elevation model data),the relief amplitude of Shaanxi Province was extracted with neighborhood statistics analysis.We selected 34 rectangular neighborhood windows(2×2,3×3,4×4,…,35×35)and 20 circular neighborhood windows(the radius ranged from 2to 21),and calculated the ratio of relief amplitude at different rectangular windows and circular windows.The optimal calculation unit was calculated by using the mean change-point analysis method.Classification map of relief amplitude in Shaanxi Province was obtained,and the features of relief amplitude were analyzed.[Results]The ratios of different topographic relief types varied greatly.The optimal statistical unit at rectangular neighborhood was 12×12,with an area of 898 704m2,while the optimal statistical unit at circular neighborhood was R=8,with an area of 1 254 191.4m2,indica-ting that the circular neighborhood was different from the rectangular neighborhood.Generally,the terrain in Shaanxi Province was relatively flat,and the relief amplitude was mainly at small and medium level.[Conclusion]The mean change-point analysis is an ideal method to determine the optimal statistical unit.
【Fund】: 山西农业大学引进人才博士科研启动项目“多尺度DEM提取地形起伏度的对比分析:以山西省为例”(2014YJ02);; 国家“863”计划项目(2013AA102401-2)
【CateGory Index】: S157
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