Identify pairs of cells that are adjacent.

adjacencyFromTransition(x)

Arguments

x

TransitionLayer

Value

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

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.

See also

Examples

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

aft <- adjacencyFromTransition(tr)

head(aft)