Description Usage Arguments Value Note Author(s) See Also Examples
Generates a semivariance values given a variogram model
1 2 |
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 |
dist_vector |
numeric vector or matrix with distance values |
debug.level |
gstat internal debug level |
a data frame of dimension (n
x 2), with columns distance and gamma
(semivariances or covariances), or in case dist_vector
is a matrix, a
conforming matrix with semivariance/covariance values is returned.
variogramLine is used to generate data for plotting a variogram model.
Edzer Pebesma
plot.gstatVariogram
1 2 3 4 5 6 7 | variogramLine(vgm(5, "Exp", 10, 5), 10, 10)
# anisotropic variogram, plotted in E-W direction:
variogramLine(vgm(1, "Sph", 10, anis=c(0,0.5)), 10, 10)
# anisotropic variogram, plotted in N-S direction:
variogramLine(vgm(1, "Sph", 10, anis=c(0,0.5)), 10, 10, dir=c(0,1,0))
variogramLine(vgm(1, "Sph", 10, anis=c(0,0.5)), dir=c(0,1,0), dist_vector = 0.5)
variogramLine(vgm(1, "Sph", 10, anis=c(0,0.5)), dir=c(0,1,0), dist_vector = c(0, 0.5, 0.75))
|
dist gamma
1 0.00001 5.000005
2 1.11112 5.525807
3 2.22223 5.996316
4 3.33334 6.417346
5 4.44445 6.794100
6 5.55556 7.131234
7 6.66667 7.432915
8 7.77778 7.702871
9 8.88889 7.944439
10 10.00000 8.160603
dist gamma
1 0.00001 0.0000030
2 1.11112 0.3278489
3 2.22223 0.6227728
4 3.33334 0.8518530
5 4.44445 0.9821677
6 5.55556 1.0000000
7 6.66667 1.0000000
8 7.77778 1.0000000
9 8.88889 1.0000000
10 10.00000 1.0000000
dist gamma
1 0.00001 0.0000015
2 1.11112 0.1659821
3 2.22223 0.3278475
4 3.33334 0.4814824
5 4.44445 0.6227716
6 5.55556 0.7475999
7 6.66667 0.8518521
8 7.77778 0.9314130
9 8.88889 0.9821674
10 10.00000 1.0000000
dist gamma
1 0.5 0.0749375
dist gamma
1 0.00 0.0000000
2 0.50 0.0749375
3 0.75 0.1122891
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