spatialEco (version 0.1-5)

vrm: Vector Ruggedness Measure (VRM)

Description

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). Quantifiying Landscape Ruggedness for Animal Habitat Anaysis: A case Study Using Bighorn Sheep inthe Mojave Desert. Journal of Wildlife Management. 71(5):1419-1426

Examples

 library(raster)
 elev <- getData('alt', country='CHE')
   vrm3 <- vrm(elev) 
   vrm5 <- vrm(elev, s=5)
   plot(stack(vrm3, vrm5))