Covariance Functions on Spheres cross Time: Beyond Spatial Isotropy and Temporal Stationarity

Abstract : Spectral representations uniquely define the covariance functions associated to random fields defined over spheres or spheres cross time. Covariance functions on spheres cross time are usually modelled under the assumptions of either spatial isotropy or axial symmetry, and the assumption of temporal stationarity. This paper goes beyond these assumptions. In particular, we consider the problem of spatially anisotropic covariance functions on spheres. The crux of our criterion is to escape from the addition theorem for spherical harmonics. We also challenge the problem of temporal nonstationarity in nonseparable space-time covariance functions, where space is the n-dimensional sphere.
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Pré-publication, Document de travail
MAP5 2016-34. 2018
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https://hal.archives-ouvertes.fr/hal-01417668
Contributeur : Anne Estrade <>
Soumis le : jeudi 11 octobre 2018 - 15:42:08
Dernière modification le : samedi 13 octobre 2018 - 01:20:54

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EFP_oct_2018.pdf
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  • HAL Id : hal-01417668, version 4

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Anne Estrade, Alessandra Fariñas, Emilio Porcu. Covariance Functions on Spheres cross Time: Beyond Spatial Isotropy and Temporal Stationarity. MAP5 2016-34. 2018. 〈hal-01417668v4〉

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