HU Zhi-rui,YANG Qin-ke,LIU Jian-fei,et al.Study on the Spatial Interpolation Uncertainty of Soil Steady Water Infiltration Rates[J].Research of Soil and Water Conservation,2009,16(03):48-51,56.
土壤稳定入渗速率空间插值不确定性研究
- Title:
- Study on the Spatial Interpolation Uncertainty of Soil Steady Water Infiltration Rates
- 分类号:
- S152.7
- 摘要:
- 以黄土丘陵沟壑第三副区的藉河流域为研究区，根据65个实测点数据，采用普通克里格法、反距离权重法、样条函数法等插值方法，分析了测点数量变化、栅格像元尺寸变化及插值方法的差异对土壤稳定入渗速率空间插值结果的影响，剖析了空间插值中的不确定性。结果表明：（1）参与插值站点越多，所得插值结果不确定性越小；（2）像元尺寸在25～800 m间变化对土壤稳定入渗速率的插值结果影响微弱；（3）不同插值方法对插值结果的精度影响较大，说明插值方法的差异对插值结果的不确定性有较大影响。
- Abstract:
- This study mainly discuss the spatial interpolation uncertainty of soil steady water infiltration rates in Ji river basin which located in the third vice-area of loess hilly and gully region. Based on the 65 actual measurement points data, the spatial interpolation methods of inverse distance weighted, ordinary kriging and spline are utilized to analyze the impact of sample numbers, cell size of interpolation grid and different interpolation methods on the results of spatial interpolation of steady water infiltration rates. The results are as follows:(1)The more samples in the interpolation, the lower uncertainty reflected by MAE; (2)The variations of cell size from 25 m, 50 m, 100 m, 200 m, 400 m, 800 m does not affect the accuracy remarkably; (3)Different interpolation methods affect the accuracy remarkably, and bring different levels of uncertainty.
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备注/Memo
收稿日期:2009-1-17。
基金项目:黄委会天水水土保持实验站项目（黄土丘陵第三副区水土流失预测预报的区域模型研究）
作者简介:胡志瑞（1983- ），男，宁夏同心县人，硕士研究生，主要从事遥感与GIS应用、空间数据挖掘和不确定性研究。E-mail：zhiruihu@nwsuaf.edu.cn
通讯作者:杨勤科（1962- ），男，陕西陇县人，研究员，主要从事基于遥感和GIS的区域水土流失评价研究。E-mail：qkyang@ms.iswc.ac.cn