Adjacent cells
Identify cells that are adjacent to a set of raster cells. Or identify adjacent polygons
## S4 method for signature 'SpatRaster' adjacent(x, cells, directions="rook", include=FALSE) ## S4 method for signature 'SpatVector' adjacent(x, type="rook", pairs=TRUE, symmetrical=FALSE )
x |
SpatRaster |
cells |
vector of cell numbers for which adjacent cells should be found. Cell numbers start with 1 in the upper-left corner and increase from left to right and from top to bottom |
directions |
the directions in which cells should be connected: "rook" (4 directions), "queen" (8 directions), "16" (knight and one-cell queen moves), or "bishop" to connect cells with one-cell diagonal moves. |
include |
logical. Should the focal cells be included in the result? |
type |
character. One of "rook", "queen", "touches", or "intersects". "queen" and "touches" are synonyms. "rook" exclude polygons that touch at a single node only. "intersects" includes polygons that touch or overlap |
pairs |
logical. If |
symmetrical |
logical. If |
matrix
r <- rast(nrows=10, ncols=10)
adjacent(r, cells=c(1, 5, 55), directions="queen")
r <- rast(nrows=10, ncols=10, crs="+proj=utm +zone=1 +datum=WGS84")
adjacent(r, cells=11, directions="rook")
# global lat/lon wraps around
r <- rast(nrows=10, ncols=10, crs="+proj=longlat +datum=WGS84")
adjacent(r, cells=11, directions="rook")
f <- system.file("ex/lux.shp", package="terra")
v <- vect(f)
a <- adjacent(v, symmetrical=TRUE)
head(a)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.