raster (version 3.6-30)

localFun: Local functions

Description

Local functions for two RasterLayer objects (using a focal neighborhood)

Usage

# S4 method for RasterLayer,RasterLayer
localFun(x, y, ngb=5, fun, filename='', ...)

Value

RasterLayer

Arguments

x

RasterLayer or RasterStack/RasterBrick

y

object of the same class as x, and with the same number of layers

ngb

integer. rectangular neighbourhood size. Either a single integer or a vector of two integers c(rows, cols), such as c(3,3) to have a 3 x 3 focal window

fun

function

filename

character. Output filename (optional)

...

additional arguments as for writeRaster

See Also

corLocal, localFun

Examples

set.seed(0)
b <- stack(system.file("external/rlogo.grd", package="raster"))
x <- flip(b[[2]], 'y') + runif(ncell(b))
y <- b[[1]] + runif(ncell(b))

f <- localFun(x, y, fun=cor)

if (FALSE) {
# local regression:
rfun <- function(x, y, ...) {
	m <- lm(y~x)
	# return R^2
	summary(m)$r.squared
}

ff <- localFun(x, y, fun=rfun)
plot(f, ff)
}