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• W3039573042 startingPage "1479" @default.
• W3039573042 abstract "Two algorithms are proposed to simulate space-time Gaussian random fields with a covariance function belonging to an extended Gneiting class, the definition of which depends on a completely monotone function associated with the spatial structure and a conditionally negative definite function associated with the temporal structure. In both cases, the simulated random field is constructed as a weighted sum of cosine waves, with a Gaussian spatial frequency vector and a uniform phase. The difference lies in the way to handle the temporal component. The first algorithm relies on a spectral decomposition in order to simulate a temporal frequency conditional upon the spatial one, while in the second algorithm the temporal frequency is replaced by an intrinsic random field whose variogram is proportional to the conditionally negative definite function associated with the temporal structure. Both algorithms are scalable as their computational cost is proportional to the number of space-time locations that may be irregular in space and time. They are illustrated and validated through synthetic examples." @default.
• W3039573042 created "2020-07-10" @default.
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• W3039573042 date "2020-06-29" @default.
• W3039573042 modified "2023-10-06" @default.
• W3039573042 title "Simulating space-time random fields with nonseparable Gneiting-type covariance functions" @default.
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• W3039573042 doi "https://doi.org/10.1007/s11222-020-09956-4" @default.
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