raster: buffer – R documentation

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buffer

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

Examples

r <- raster(ncol=36,nrow=18)
values(r) <- NA
r[500] <- 1
b <- buffer(r, width=5000000) 
#plot(b)

raster

Geographic Data Analysis and Modeling

v3.4-10

GPL (>= 3)

Authors

Robert J. Hijmans [cre, aut] (<https://orcid.org/0000-0001-5872-2872>), Jacob van Etten [ctb], Michael Sumner [ctb], Joe Cheng [ctb], Dan Baston [ctb], Andrew Bevan [ctb], Roger Bivand [ctb], Lorenzo Busetto [ctb], Mort Canty [ctb], Ben Fasoli [ctb], David Forrest [ctb], Aniruddha Ghosh [ctb], Duncan Golicher [ctb], Josh Gray [ctb], Jonathan A. Greenberg [ctb], Paul Hiemstra [ctb], Kassel Hingee [ctb], Institute for Mathematics Applied Geosciences [cph], Charles Karney [ctb], Matteo Mattiuzzi [ctb], Steven Mosher [ctb], Babak Naimi [ctb], Jakub Nowosad [ctb], Edzer Pebesma [ctb], Oscar Perpinan Lamigueiro [ctb], Etienne B. Racine [ctb], Barry Rowlingson [ctb], Ashton Shortridge [ctb], Bill Venables [ctb], Rafael Wueest [ctb]

Initial release

2021-05-02