https://github.com/cran/gstat
Tip revision: 1549b8b75c1deb686557cf1fc81402e3170801cc authored by Edzer Pebesma on 19 October 2010, 11:41:01 UTC
version 0.9-74
version 0.9-74
Tip revision: 1549b8b
blockkr.R
library(gstat)
data(meuse)
coordinates(meuse) = c("x", "y")
new.locs <- SpatialPoints(data.frame(
x = c(181170, 180310, 180205, 178673, 178770, 178270),
y = c(333250, 332189, 331707, 330066, 330675, 331075)))
krige(zinc ~ 1, meuse, new.locs, vgm(1.34e5, "Sph", 800, nug = 2.42e4),
block = c(40,40), nmax = 40)
new.locs <- SpatialPoints(data.frame(x = c(181170), y = c(333250)))
disc = c(-15,-5,5,15)
block.irreg <- data.frame(expand.grid(x = disc, y = disc))
block.irreg
# first disable default Gaussian quadrature used for block integration, by
# setting nblockdiscr explicitly:
krige(zinc ~ 1, meuse, new.locs, model = vgm(1.34e5, "Sph", 800, nug = 2.42e4),
block = c(40,40), nmax = 40, set = list(nblockdiscr=4))
# now pass the same block discretization as block.irreg:
krige(zinc ~ 1, meuse, new.locs, vgm(1.34e5, "Sph", 800, nug = 2.42e4),
block = block.irreg, nmax = 40)
# check weights argument:
block.irreg <- data.frame(expand.grid(x = disc, y = disc), weights = rep(1/16, 16))
krige(zinc ~ 1, meuse, new.locs, vgm(1.34e5, "Sph", 800, nug = 2.42e4),
block = block.irreg, nmax = 40)