raster (version 2.1-49)

distance: Distance

Description

Calculate the distance, for all cells that are NA, to the nearest cell that is not NA. The distance unit is in meters if the RasterLayer is not projected (+proj=longlat) and in map units (typically also meters) when it is projected.

Usage

## S3 method for class 'RasterLayer':
distance(x, filename='', doEdge=TRUE, ...)

Arguments

x

RasterLayer object

filename

Character. Filename for the output RasterLayer (optional)

doEdge

Logical. If TRUE, the edge function is called first. This may be efficient in cases where you compute the distance to large blobs. Calling edge determines the edge cells that matter for distance c

...

Additional arguments as for writeRaster

Value

• RasterLayer

See Also

distanceFromPoints, gridDistance, pointDistance See the gdistance package for more advanced distances, and the geosphere package for great-circle distances (and more) between points in longitude/latitude coordinates.

Examples

r <- raster(ncol=36,nrow=18)
r[] <- NA
r[500] <- 1
dist <- distance(r) 
#plot(dist / 1000)