A class of Matérn-like covariance functions for smooth processes on a sphere

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Spatio-Temporal Covariance and Cross-Covariance Functions of the Great Circle Distance on a Sphere (2016, background): “Notable attempts to solve this problem have been made in Jeong and Jun (2015) without success because closed forms are not available. Instead, the Matérn function can be composed with the chordal distance without any restriction on the parameter ν. Standard Taylor expansion shows that all of the par”