A nearest‐neighbour Gaussian process spatial factor model for censored, multi‐depth geochemical data
A nearest‐neighbour Gaussian process spatial factor model for censored, multi‐depth geochemical data
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用于审查的多深度地球化学数据的最近邻高斯过程空间因子模型
DOI:
10.1111/rssc.12565
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Turnbull, Rose E.
中科院分区:
文献类型:
--
作者:
Davies, Tilman M.;Banerjee, Sudipto;Martin, Adam P.;Turnbull, Rose E.
We investigate the relationships between local environmental variables and the geochemical composition of the Earth in a region spanning over 26,000 km2in the lower South Island of New Zealand. Part of the Southland–South Otago geochemical baseline survey—a pilot study pre-empting roll-out across the country—the data comprise the measurements of 59 chemical trace elements, each at two depth prescriptions, at several hundred spatial sites. We demonstrate construction of a hierarchical spatial factor model that captures inter-depth dependency; handles imputation of left-censored readings in a statistically principled manner; and exploits sparse approximations to Gaussian processes to deliver inference. The voluminous results provide a novel impression of the underlying processes and are presented graphically via simple web-based applications. These both confirm existing knowledge and provide a basis from which new research hypotheses in geochemistry might be formed.
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DOI:
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1952
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