direction: Direction

In raster: Geographic Data Analysis and Modeling

Description

The direction (azimuth) to or from the nearest cell that is not NA. The direction unit is in radians, unless you use argument degrees=TRUE.

Usage

## S4 method for signature 'RasterLayer'
direction(x, filename='', degrees=FALSE, from=FALSE, doEdge=FALSE, ...) 

Arguments

x	RasterLayer object
filename	Character. Output filename (optional)
degrees	Logical. If FALSE (the default) the unit of direction is radians.
from	Logical. Default is FALSE. If TRUE, the direction from (instead of to) the nearest cell that is not NA is returned
doEdge	Logical. If TRUE, the boundaries function is called first. This may be efficient in cases where you compute the distance to large blobs. Calling boundaries determines the edge cells that matter for distance computation
...	Additional arguments as for writeRaster

Value

RasterLayer

See Also

distance, gridDistance

For the direction between (longitude/latitude) points, see the azimuth function in the geosphere package

Examples

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

Example output

Loading required package: sp

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