point-point, point-area or area-area semivariance
Compute point-point, point-area or area-area variogram values from point model
vgmArea(x, y = x, vgm, ndiscr = 16, verbose = FALSE, covariance = TRUE)
x |
object of class SpatialPoints or SpatialPolygons |
y |
object of class SpatialPoints or SpatialPolygons |
vgm |
variogram model, see vgm |
ndiscr |
number of points to discretize an area, using spsample |
verbose |
give progress bar |
covariance |
logical; compute covariances, rather than semivariances? |
semivariance or covariance matrix of dimension length(x) x lenght(y)
Edzer Pebesma
library(sp) demo(meuse, ask = FALSE, echo = FALSE) vgmArea(meuse[1:5,], vgm = vgm(1, "Exp", 1000)) # point-point vgmArea(meuse[1:5,], meuse.area, vgm = vgm(1, "Exp", 1000)) # point-area
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