separable \(sill\,C_s(h)C_t(u)\); productSum \(C_t + C_s + k C_t C_s\)
(De Cesare et al. 2001); metric \(C_j(\sqrt{h^2 + (\kappa u)^2})\);
sumMetric \(C_s + C_t + C_j(\sqrt{h^2 + (\kappa u)^2})\). Components
are lists with model (Exp, Gau, Sph, Mat with kappa, Nug),
psill, range, nugget, as gstat vgm (Graeler,
Pebesma and Heuvelink 2016).
Usage
STCovariance(ds, dt, model)
Arguments
- ds
Spatial lag(s).
- dt
Time lag(s).
- model
List with type and its components.
References
Graeler, B., Pebesma, E. and Heuvelink, G. (2016).
Spatio-temporal interpolation using gstat. The R Journal 8, 204-218.
Examples
m <- list(type = "separable", sill = 2, space = list(model = "Exp", range = 1),
time = list(model = "Gau", range = 2))
STCovariance(1, 1, m)
#> [1] 0.5730096
