gsi.Cokriging {gmGeostats}

Cokriging of all sorts, internal function

Description

internal function to compute cokriging (simple, ordinary, universal, with trend)

Usage

gsi.Cokriging(
  Xout,
  Xin,
  Zin,
  vgram,
  Fin = rep(1, nrow(Xin)),
  Fout = rep(1, nrow(Xout)),
  krigVar = FALSE,
  tol = 1e-15
)

Arguments

Xout

(M,g)-matrix with coordinates of desired interpolation locations

Xin

(N,g)-matrix with coordinates of conditioning locations

Zin

(N,D)-matrix with condtioning observations

vgram

D-dimensional variogram model of class "gmCgram"

Fin

either NULL or a (N,p)-matrix with the base functions of the trend evaluated at the conditioning locations (defaults to a vector of $N$ 1's)

Fout

either NULL or a (m,p)-matrix with the base functions of the trend evaluated at the conditioning locations (defaults to a vector of $M$ 1's)

krigVar

logical or NA, should kriging variances be returned? FALSE=no, TRUE=give point-wise cokriging covariance; NA=return the whole covariance matrix of all points

tol

tolerance for the inversion of the cokriging matrix (in case of near-singularity)

Value

A (M,D)-matrix of predictions, eventually with an attribute "krigVar" containing the output defined by argument krigVar