raster (version 1.9-13)

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

distance(x, ...)

Arguments

x

a RasterLayer object

...

additional arguments. See Details.

Value

• A RasterLayer object

Details

The following additional arguments can be passed, to replace default values for this function rll{ filename Filename for the output RasterLayer 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 computation format Character. Output file type. See writeRaster datatype Character. Output data type. See dataType overwrite Logical. If TRUE, "filename" will be overwritten if it exists progress Character. "text", "window", or "" (the default, no progress bar) }

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)