Spatial prediction of soil properties in a watershed scale through maximum likelihood approach |
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Authors: | Priyabrata Santra Bhabani Sankar Das Debashish Chakravarty |
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Institution: | (1) Present address: Division of Agricultural Engineering for Arid Production Systems, Central Arid Zone Research Institute, Jodhpur, Rajasthan, 345001, India;(2) Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur, 721302, India;(3) Department of Mining Engineering, Indian Institute of Technology, Kharagpur, 721302, India |
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Abstract: | Surface map of soil properties plays an important role in various applications in a watershed. Ordinary kriging (OK) and regression
kriging (RK) are conventionally used to prepare these surface maps but generally need large number of regularly girded soil
samples. In this context, REML-EBLUP (REsidual Maximum Likelihood estimation of semivariogram parameters followed by Empirical
Best Linear Unbiased Prediction) shown capable but not fully tested in a watershed scale. In this study, REML-EBLUP approach
was applied to prepare surface maps of several soil properties in a hilly watershed of Eastern India and the performance was
compared with conventionally used spatial interpolation methods: OK and RK. Evaluation of these three spatial interpolation
methods through root-mean-squared residuals (RMSR) and mean squared deviation ratio (MSDR) showed better performance of REML-EBLUP
over the other methods. Reduction in sample size through random selection of sampling points from full dataset also resulted
in better performance of REML-EBLUP over OK and RK approach. The detailed investigation on effect of sample number on performance
of spatial interpolation methods concluded that a minimum sampling density of 4/km2 may successfully be adopted for spatial prediction of soil properties in a watershed scale using the REML-EBLUP approach. |
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