Implementation of the Sappington et al., (2007) vector
ruggedness measure
Usage
vrm(x, s = 3, file.name = NULL, ...)
Arguments
x
Elevation raster class object
s
Scale of window. Must be odd number, can
represent 2 dimensions (eg., s=c(3,5) would
represent a 3 x 5 window)
file.name
Name of output raster (optional)
...
Additional arguments passed to writeRaster
Value
raster class object or raster written to disk
References
Sappington, J.M., K.M. Longshore, D.B. Thomson (2007). Quantifying Landscape
Ruggedness for Animal Habitat Analysis: A case Study Using Bighorn Sheep in
the Mojave Desert. Journal of Wildlife Management. 71(5):1419-1426