vgmArea function

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)

Arguments

• 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?

Returns

semivariance or covariance matrix of dimension length(x) x lenght(y)

Author(s)

Edzer Pebesma

Examples

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