direction: Direction

In rspatial/terra: Spatial Data Analysis

Direction

Description

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

Usage

## S4 method for signature 'SpatRaster'
direction(x, from=FALSE, degrees=FALSE, method="cosine", filename="", ...) 

Arguments

x	SpatRaster
from	Logical. Default is FALSE. If TRUE, the direction from (instead of to) the nearest cell that is not NA is returned
degrees	Logical. If FALSE (the default) the unit of direction is radians.
method	character. Should be "geo", or "cosine". With "geo" the most precise but slower geodesic method of Karney (2003) is used. The "cosine" method is faster but less precise
filename	Character. Output filename (optional)
...	Additional arguments as for writeRaster

Value

SpatRaster

See Also

distance

Examples

r <- rast(ncol=36,nrow=18, crs="+proj=merc")
values(r) <- NA
r[306] <- 1
b <- direction(r, degrees=TRUE) 
plot(b)

crs(r) <- "+proj=longlat"
b <- direction(r) 
plot(b)

rspatial/terra documentation built on Jan. 7, 2025, 6:27 p.m.