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| DOI | 10.1007/S00477-021-02162-2 | ||||
| Año | 2022 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
This paper presents a parametric family of compactly-supported positive semidefinite kernels aimed to model the covariance structure of second-order stationary isotropic random fields defined in the d-dimensional Euclidean space. Both the covariance and its spectral density have an analytic expression involving the hypergeometric functions F-2(1) and F-1(2), respectively, and four real-valued parameters related to the correlation range, smoothness and shape of the covariance. The presented hypergeometric kernel family contains, as special cases, the spherical, cubic, penta, Askey, generalized Wendland and truncated power covariances and, as asymptotic cases, the Matern, Laguerre, Tricomi, incomplete gamma and Gaussian covariances, among others. The parameter space of the univariate hypergeometric kernel is identified and its functional properties-continuity, smoothness, transitive upscaling (montee) and downscaling (descente)-are examined. Several sets of sufficient conditions are also derived to obtain valid stationary bivariate and multivariate covariance kernels, characterized by four matrix-valued parameters. Such kernels turn out to be versatile, insofar as the direct and cross-covariances do not necessarily have the same shapes, correlation ranges or behaviors at short scale, thus associated with vector random fields whose components are cross-correlated but have different spatial structures.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Emery, Xavier M. | Hombre |
Universidad de Chile - Chile
Advanced Mining Technology Center - Chile Centro Avanzado de Tecnologia para la Mineria - Chile |
| 2 | Alegria, A. | Hombre |
Universidad Técnica Federico Santa María - Chile
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| Fuente |
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| Fondo Nacional de Desarrollo Científico y Tecnológico |
| ANID |
| National Agency for Research and Development of Chile |
| Agradecimiento |
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| The authors acknowledge the funding of the National Agency for Research and Development of Chile, through Grants ANID/FONDECYT/REGULAR/1210050 (X.E. and A.A.) and ANID PIA AFB180004 (X.E.). |
| The authors acknowledge the funding of the National Agency for Research and Development of Chile, through Grants ANID / FONDECYT / REGULAR / 1210050 (X.E. and A.A.) and ANID PIA AFB180004 (X.E.). |