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A comparison of search strategies to design the cokriging neighborhood for predicting coregionalized variables

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Abstract

Cokriging allows predicting coregionalized variables from sampling information, by considering their spatial joint dependence structure. When secondary covariates are available exhaustively, solving the cokriging equations may become prohibitive, which motivates the use of a moving search neighborhood to select a subset of data, based on their closeness to the target location and the screen effect approximation. This paper investigates the efficiency of different strategies for designing a sub-optimal neighborhood wherein the simplification of the cokriging equations is challenging. To do so, five alternatives (single search, multiple search, strictly collocated search, multi-collocated search and isotopic search) are tested and compared with the reference unique neighborhood, through synthetic examples with different data configurations and spatial joint correlation models. The results indicate that the multi-collocated and multiple searches bear the highest resemblance to the reference case under the analyzed spatial structure models, while the single and the isotopic searches, which do not differentiate the primary and secondary sampling designs, yield the poorest results in terms of cokriging error variance.

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Acknowledgements

The first author acknowledges the Nazarbayev University for funding this work via “Faculty development competitive research Grants for 2018–2020” under Contract No. 090118FD5336. The second author acknowledges the Chilean Commission for Scientific and Technological Research (CONICYT), through Grant CONICYT PIA Anillo ACT1407.

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Authors and Affiliations

  1. Department of Mining Engineering, School of Mining and Geosciences, Nazarbayev University, Astana, Kazakhstan

    Nasser Madani

  2. Department of Mining Engineering, University of Chile, Santiago, Chile

    Xavier Emery

  3. Advanced Mining Technology Center, University of Chile, Santiago, Chile

    Xavier Emery

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  1. Nasser Madani
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  2. Xavier Emery
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Correspondence to Nasser Madani.

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Madani, N., Emery, X. A comparison of search strategies to design the cokriging neighborhood for predicting coregionalized variables. Stoch Environ Res Risk Assess 33, 183–199 (2019). https://doi.org/10.1007/s00477-018-1578-1

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