direction function

Direction

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.

## 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

Returns

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)