endas.localization.taper.Spherical

class endas.localization.taper.Spherical

Bases: endas.localization.TaperFn

Spherical covariance tapering function.

The taper function is defined by

\[\begin{split}G(r) = \begin{cases} \left( 1 - \left( \frac{2}{3}\frac{r}{L} - \frac{1}{2}\frac{r}{L}^3 \right) \right) & \mbox{if } r < L \\ 0 & \mbox{otherwise} \end{cases}\end{split}\]

where r is the distance (between two state variables) and L is the distance scale factor (the localization radius). Therefore, the support range of the tapering function is L.