Vector Ruggedness Measure (VRM)

Implementation of the Sappington et al., (2007) vector ruggedness measure

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

Note

This function measures terrain ruggedness by calculating the vector ruggedness measure

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

Author

Jeffrey S. Evans <jeffrey_evans@tnc.org>

Examples

 library(raster)
 data(elev)
   vrm3 <- vrm(elev) 
   vrm5 <- vrm(elev, s=5)
   plot(stack(vrm3, vrm5))