Last data update: 2014.03.03

 R: Expand an existing class of patches.
expandClassR Documentation

Expand an existing class of patches.

Description

Expand an existing class of patches.

Usage

expandClass(context, class, size, bgr = 0, pts = NULL)

Arguments

context

Raster object or matrix, an empty landscape raster or a mask indicating where the patch cannot be generated (see bgr below).

class

(or patch),

size

integer. Size of expansion, as number of raster cells.

bgr

integer. The background available where expansion is allowed (i.e. shrinking classes).

pts

integer, the seed point locations around which the patches are built (random points are given by default)

Value

A RasterLayer object. If rast=FALSE returns a list of vectors, each containing the context cells assigned to each patch.

Examples

require(raster)

m = matrix(0, 33, 33)
r = raster(m, xmn=0, xmx=10, ymn=0, ymx=10)
r = makeClass(r, 5, 10)
plot(r)

rr = expandClass(r, 1, 100)
plot(rr)

## This function can be used to mimic shapes, by providing a skeleton:
m[,17] = 1
r = raster(m, xmn=0, xmx=10, ymn=0, ymx=10)
plot(r)

rr = expandClass(r, 1, 100)
plot(rr)

Results


Created & Maintained by Osamu Ogasawara (osamu.ogasawara@gmail.com) and IMSBIO