https://github.com/cran/fields
Tip revision: edc2e35928199cac9fcb165e66ad178009f37726 authored by Doug Nychka on 20 April 2012, 00:00:00 UTC
version 6.7.6
version 6.7.6
Tip revision: edc2e35
Tps.r
# fields, Tools for spatial data
# Copyright 2004-2011, Institute for Mathematics Applied Geosciences
# University Corporation for Atmospheric Research
# Licensed under the GPL -- www.gpl.org/licenses/gpl.html
"Tps" <- function(x, Y, m = NULL, p = NULL, scale.type = "range",
lon.lat = FALSE, miles = TRUE, ...) {
x <- as.matrix(x)
d <- ncol(x)
if (is.null(p)) {
if (is.null(m)) {
m <- max(c(2, ceiling(d/2 + 0.1)))
}
p <- (2 * m - d)
if (p <= 0) {
stop(" m is too small you must have 2*m -d >0")
}
}
Tpscall <- match.call()
if (!lon.lat) {
Tpscall$cov.function <- "Thin plate spline radial basis functions (Rad.cov) "
Krig(x, Y, cov.function = Rad.cov, m = m, scale.type = scale.type,
outputcall = Tpscall, p = p, GCV = TRUE, ...)
}
else {
# use different coding of the radial basis fucntions to use with great circle distance.
Tpscall$cov.function <- "Thin plate spline radial basis functions (RadialBasis.cov) using great circle distance "
Krig(x, Y, cov.function = stationary.cov, m = m, scale.type = scale.type,
outputcall = Tpscall, GCV = TRUE, cov.args = list(Covariance = "RadialBasis",
M = m, dimension = 2, Distance = "rdist.earth",
Dist.args = list(miles = miles)), ...)
}
}