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《Journal of Anhui Agricultural Sciences》 2009-19
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Quantitative Analysis on the Influence of Three Sampling Methods on DEM Quality

TIAN Hong-zhen et al(Key Laboratory of Western China's Environmental Systems(Ministry of Education),Lanzhou University,Lanzhou,Gansu 730000)  
This research was designed to evaluate different sampling methods of collecting Digital Elevation model(DEM) source data.A variety of methods including simple random sampling,systematic sampling,stratified sampling,cluster sampling,and progressive sampling had been used to collect DEM source data.However,there was little quantitative information on sampling methods of collecting DEM source data.In practice,sampling method was determined by experience.A 30 cm×30 cm DEM was used to test the effect of three common used sampling methods(simple random sampling,systematic sampling,stratified sampling).Every sampling result of each sampling methods was interpolated using three ways including Kriging,Spline,and Inverse Distance Weighted(IDW) in order to eliminate influence of different interpolating methods.By a combined analysis of experimental results,demonstrating simple random sampling was less accurate than the others;systematic sampling was suitable for applications that require precise relative altitudes;stratified sampling was suitable for applications that require precise average altitudes.
【Fund】: 国家自然科学基金项目(40871057)
【CateGory Index】: P208
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