buffer {terra}

R Documentation

Create a buffer around vector geometries or raster patches

Description

Calculate a buffer around all cells that are not NA in a SpatRaster, or around the geometries of a SpatVector)

Note that the distance unit of the buffer width parameter is meters if the CRS is (+proj=longlat), and in map units (typically also meters) if not.

Usage

## S4 method for signature 'SpatRaster'
buffer(x, width, filename="", ...)

## S4 method for signature 'SpatVector'
buffer(x, width, quadsegs=10)

Arguments

x	SpatRaster or SpatVector
width	numeric. Unit is meter if x has a longitude/latitude CRS, or mapunits in other cases. Should be > 0 for SpatRaster
filename	character. Output filename
...	additional arguments for writing files as in writeRaster
quadsegs	positive integer. Number of line segments to use to draw a quart circle

Value

SpatRaster

See Also

distance

Examples

Run examples

r <- rast(ncols=36, nrows=18)
v <- rep(NA, ncell(r))
v[500] <- 1
values(r) <- v
b <- buffer(r, width=5000000) 
plot(b)

v <- vect(rbind(c(10,10), c(0,60)), crs="+proj=merc")
b <- buffer(v, 20)
plot(b)
points(v)

crs(v) <- "+proj=longlat" 
b <- buffer(v, 1500000)
plot(b)
points(v)

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