buffer: buffer

In raster: Geographic Data Analysis and Modeling

Description

Calculate a buffer around all cells that are not NA or around SpatialPoints, Lines, or Polygons.

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.

Except for SpatialLines and SpatialPolygons that are currently handled by rgeos, and can only deal with planar coordinate reference systems.

Usage

## S4 method for signature 'RasterLayer'
buffer(x, width=0, filename='', doEdge=FALSE, ...)

## S4 method for signature 'Spatial'
buffer(x, width=1, dissolve=TRUE, ...)

Arguments

x	RasterLayer or Spatial* object
width	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)
values(r) <- NA
r[500] <- 1
b <- buffer(r, width=5000000) 
#plot(b)

Example output

Loading required package: sp

raster documentation built on Jan. 5, 2021, 3:01 a.m.