autofitVgm: Auto fit variogram for points.

In atakrig: Area-to-Area Kriging

Auto fit variogram for points.

Description

Auto fit variogram for points.

Usage

autofitVgm(x, y = x, ngroup = c(12, 15), rd = seq(0.3, 0.9, by = 0.1),
    model = c("Sph", "Exp", "Gau"), fit.nugget = TRUE, fixed.range = NA,
    longlat = FALSE, fig = FALSE, ...)

Arguments

x, y	values of areas, data.frame(areaId,centx,centy,value).
ngroup	number of bins to average from semivariogram cloud.
rd	ratio of max distance between points to be considered for bins.
model	variogram model defined in gstat::vgms(), e.g. "Exp", "Sph", "Gau".
fit.nugget	fit variogram nugget or not.
fixed.range	variogram range fixed or not.
longlat	indicator whether coordinates are longitude/latitude.
fig	whether to plot fitted variogram.
...	additional parameters passed to gstat::vgm().

Value

model	fitted variogramModel.
sserr	fit error.
bins	binned gstatVariogram.

Note

The auto-search strategy was derived from automap::autofitVariogram(). The function tries different initial values of vgm to find the best fitted model.

atakrig documentation built on Oct. 9, 2023, 5:10 p.m.