Adjacent cells

Description

Identify pairs of cells that are adjacent.

Usage

adjacencyFromTransition(x) 

Arguments

Details

Extracts the indices of those cells that are connected (e.g. cells i,j that have a non-zero value in the transition matrix).

Cell numbers are unique indices of cells in the original grid. By convention, cell numbers start with 1 in the upper-left corner of the grid and increase from left to right and from top to bottom.

Value

A two column matrix with each row containing a pair of adjacent cells.

Author(s)

Jacob van Etten jacobvanetten@yahoo.com

See Also

adjacent

Examples

r <- raster(nrows=6, ncols=7, xmn=0, xmx=7, ymn=0, ymx=6, crs="+proj=utm +units=m")
r[] <- runif(6*7)
T <- transition(r, function(x) 1/mean(x), 8) 
adjacencyFromTransition(T)

Results