Get cell numbers
Get the cell numbers covered by a SpatVector or SpatExtent. Or that match values in a vector; or all non NA values.
## S4 method for signature 'SpatRaster,missing' cells(x, y) ## S4 method for signature 'SpatRaster,numeric' cells(x, y) ## S4 method for signature 'SpatRaster,SpatVector' cells(x, y, method="simple", weights=FALSE, exact=FALSE, touches=is.lines(y)) ## S4 method for signature 'SpatRaster,SpatExtent' cells(x, y)
x |
SpatRaster |
y |
SpatVector, SpatExtent, 2-column matrix representing points, numeric representing values to match, or missing |
method |
character. Method for getting cell numbers for points. The default is "simple", the alternative is "bilinear". If it is "bilinear", the four nearest cells and their weights are returned |
weights |
logical. If |
exact |
logical. If |
touches |
logical. If |
numeric vector or matrix
r <- rast(ncols=10, nrows=10)
values(r) <- 1:ncell(r)
r[c(1:25, 31:100)] <- NA
r <- ifel(r > 28, r + 10, r)
# all cell numbers of cells that are not NA
cells(r)
# cell numbers that match values
x <- cells(r, c(28,38))
x$lyr.1
# cells for points
m <- cbind(x=c(0,10,-30), y=c(40,-10,20))
cellFromXY(r, m)
v <- vect(m)
cells(r, v)
cells(r, v, method="bilinear")
# cells for polygons
#f <- system.file("ex/lux.shp", package="terra")
#v <- vect(f)
#r <- rast(v)
#cv <- cells(r, v)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.