Calculate a buffer around all cells that are not NA.
Note that the distance unit of the buffer width parameter is meters if the RasterLayer is not projected (+proj=longlat), and in map units (typically also meters) when it is projected.
numeric > 0. Unit is meter if x has a longitude/latitude CRS, or mapunits in other cases
filename
character. Filename for the output RasterLayer (optional)
doEdge
logical. If TRUE, the boundaries function is called first. This may be efficient in cases where you compute a buffer around very large areas because boundaries determines the edge cells that matter for distance computation
dissolve
logical. If TRUE, buffer geometries of overlapping polygons are dissolved and all geometries are aggregated and attributes (the data.frame) are dropped
...
Additional arguments as for writeRaster
Value
RasterLayer or SpatialPolygons* object
See Also
distance, gridDistance, pointDistance
Examples
r <- raster(ncol=36,nrow=18)
r[] <- NA
r[500] <- 1
b <- buffer(r, width=5000000)
#plot(b)