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Compute Spatial Variogram

Usage

variogram(krig, nint, plotit=T, ...)

Arguments

krig trend-surface or kriging object with columns x, y, and z
nint number of bins used
plotit logical for plotting
... parameters for the plot

Description

Divides range of data into nint bins, and computes the average squared difference for pairs with separation in each bin. Returns results for bins with 6 or more pairs.

Value

x and y coordinates of the variogram and cnt, the number of pairs averaged per bin.

Side Effects

Plots the variogram if plotit = T

See Also

correlogram

Examples

  data(topo)
  topo.kr <- surf.ls(2, topo)
  variogram(topo.kr, 25)