variogram.line {gstat} | R Documentation |
Generates a semivariance values given a variogram model
variogram.line(object, maxdist, n = 200, min = 1.0e-6 * maxdist, dir = c(1,0,0), covariance = FALSE, ...)
object |
variogram model for which we want semivariance function values |
maxdist |
maximum distance for which we want semivariance values |
n |
number of points |
min |
minimum distance; a value slightly larger than zero is usually used to avoid the discontinuity at distance zero if a nugget component is present |
dir |
direction vector: unit length vector pointing the direction in x (East-West), y (North-South) and z (Up-Down) |
covariance |
logical; if TRUE return covariance values, otherwise return semivariance values |
... |
ignored |
a data frame of dimension (n
x 2), with columns distance and gamma
this function is used to plot a variogram model
Edzer J. Pebesma
variogram.line(vgm(5, "Exp", 10, 5), 10, 10) # anisotropic variogram, plotted in E-W direction: variogram.line(vgm(1, "Sph", 10, anis=c(0,0.5)), 10, 10) # anisotropic variogram, plotted in N-S direction: variogram.line(vgm(1, "Sph", 10, anis=c(0,0.5)), 10, 10, dir=c(0,1,0))