focalWeight

0th

Percentile

Focal weights matrix

Calculate focal ("moving window") weight matrix for use in the focal function. The sum of the values adds up to one.

Keywords
spatial
Usage
focalWeight(x, d, type=c('circle', 'Gauss', 'rectangle'))
Arguments
x

Raster* object

d

numeric. If type=circle, the radius of the circle (in units of the CRS). If type=rectangle the dimension of the rectangle (one or two numbers). If type=Gauss the size of sigma, and optionally another number to determine the size of the matrix returned (default is 3 times sigma)

type

character indicating the type of filter to be returned

Value

matrix that can be used in focal

Aliases
  • focalWeight
Examples
# NOT RUN {
r <- raster(ncols=36, nrows=18, xmn=0)
# Gaussian filter for square cells
gf <- focalWeight(r, 2, "Gauss")
# }
Documentation reproduced from package raster, version 2.9-5, License: GPL (>= 3)

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