Package: LatticeKrig
Version: 5.4
Date: 2015-10-21
Title: Multiresolution Kriging Based on Markov Random Fields
Author: Douglas Nychka [aut, cre], Dorit Hammerling [aut], Stephan Sain [aut], Nathan Lenssen [aut]
Authors@R: c(
person("Douglas", "Nychka", role = c("aut", "cre"),
email = "nychka@ucar.edu"),
person("Dorit", "Hammerling", role = c("aut"),
email = "hammerling@samsi.info"),
person("Stephan", "Sain", role = "aut",
email = "ssain@ucar.edu"),
person("Nathan", "Lenssen", role = "aut",
email = "lenssen@ucar.edu"))
Maintainer: Douglas Nychka <nychka@ucar.edu>
Description: Functions for the interpolation of large spatial
datasets. This package follows a "fixed rank Kriging" approach using
a large number of basis functions and provides spatial estimates
that are comparable to standard families of covariance functions.
Using a large number of basis functions allows for estimates that
can come close to interpolating the observations (a spatial model
with a small nugget variance.)  Moreover, the covariance model for this method
can approximate the Matern covariance family but also allows for a
multi-resolution model and supports efficient computation of the
profile likelihood for estimating covariance parameters. This is
accomplished through compactly supported basis functions and a
Markov random field model for the basis coefficients. These features
lead to sparse matrices for the computations. An extension of this
version over previous ones ( < 5.4 ) is the support for different
geometries besides a rectangular domain.
One benefit of the LatticeKrig model/approach
is the facility to do unconditional and conditional
simulation of the field for large numbers of arbitrary points. There
is also the flexibility for estimating non-stationary covariances. Included are
generic methods for prediction, standard errors for prediction,
plotting of the estimated surface and conditional and unconditional
simulation.
License: GPL (>= 2)
URL: http://www.r-project.org
Depends: R (>= 3.0.1), methods, spam, fields (>= 6.9.1)
Packaged: 2015-10-22 15:12:56 UTC; nychka
NeedsCompilation: yes
Repository: CRAN
Date/Publication: 2015-10-22 22:14:23