# 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
"fields.x.to.grid" <- function(x, nx = 80, ny = 80,
xy = c(1, 2)) {
M <- ncol(x)
grid.list <- as.list(1:M)
# add columns names
names(grid.list) <- dimnames(x)[[2]]
# cruise through x dimensions and find medians.
for (k in 1:M) {
grid.list[[k]] <- median(x[, k])
}
#
#
# overwrite with sequences for the two variables of surface
xr <- range(x[, xy[1]])
yr <- range(x[, xy[2]])
grid.list[[xy[1]]] <- seq(xr[1], xr[2], , nx)
grid.list[[xy[2]]] <- seq(yr[1], yr[2], , ny)
grid.list
}