raster: direction – R documentation

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direction

Direction

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

Examples

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

raster

Geographic Data Analysis and Modeling

v3.4-10

GPL (>= 3)

Authors

Robert J. Hijmans [cre, aut] (<https://orcid.org/0000-0001-5872-2872>), Jacob van Etten [ctb], Michael Sumner [ctb], Joe Cheng [ctb], Dan Baston [ctb], Andrew Bevan [ctb], Roger Bivand [ctb], Lorenzo Busetto [ctb], Mort Canty [ctb], Ben Fasoli [ctb], David Forrest [ctb], Aniruddha Ghosh [ctb], Duncan Golicher [ctb], Josh Gray [ctb], Jonathan A. Greenberg [ctb], Paul Hiemstra [ctb], Kassel Hingee [ctb], Institute for Mathematics Applied Geosciences [cph], Charles Karney [ctb], Matteo Mattiuzzi [ctb], Steven Mosher [ctb], Babak Naimi [ctb], Jakub Nowosad [ctb], Edzer Pebesma [ctb], Oscar Perpinan Lamigueiro [ctb], Etienne B. Racine [ctb], Barry Rowlingson [ctb], Ashton Shortridge [ctb], Bill Venables [ctb], Rafael Wueest [ctb]

Initial release

2021-05-02