raster (version 1.8-3)

direction: Direction

Description

The direction (azimuth) to the nearest cell that is not NA. The direction unit is in degrees (not radians). If you want radians, use fun=function(x){x}.

Usage

direction(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{ fun A function that takes the direction (in radians!) as argument. E.g. sin from Logical. Default is FALSE. If TRUE, the direction from (instead of to) the nearest cell that is not NA is returned filename Filename for the output RasterLayer 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

distance, gridDistance For the direction between points, see the azimuth function in the geosphere package

Examples

r <- raster(ncol=36,nrow=18)
r[] <- NA
r[306] <- 1
b <- direction(r, fun=sin, from=TRUE) 
#plot(b)