R: point-point, point-area or area-area semivariance

vgmArea {gstat} | R Documentation

## point-point, point-area or area-area semivariance

### Description

Compute point-point, point-area or area-area variogram values from point model

### Usage

    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?

### Value

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

[Package gstat version 2.0-3 Index]