nlm_fbm

Creates a two-dimensional fractional Brownian motion neutral landscape model.

Usage

nlm_fbm(
  ncol,
  nrow,
  resolution = 1,
  fract_dim = 1,
  user_seed = NULL,
  rescale = TRUE,
  ...
)

Arguments

ncol

[numerical(1)]
Number of columns forming the raster.

nrow

[numerical(1)]
Number of rows forming the raster.

resolution

[numerical(1)]
Resolution of the raster.

fract_dim

[numerical(1)]
The fractal dimension of the process (0,2)

user_seed

[numerical(1)]
Set random seed for the simulation

rescale

[numeric(1)]
If TRUE (default), the values are rescaled between 0-1.

...

Unused

Value

character(1) Temporary maintenance message.

Details

Neutral landscapes are generated using fractional Brownian motion, an extension of Brownian motion in which the amount of correlation between steps is controlled by frac_dim. A high value of frac_dim produces a relatively smooth, correlated surface while a low value produces a rough, uncorrelated one.

References

Travis, J.M.J. & Dytham, C. (2004). A method for simulating patterns of habitat availability at static and dynamic range margins. Oikos , 104, 410–416.

Martin Schlather, Alexander Malinowski, Peter J. Menck, Marco Oesting, Kirstin Strokorb (2015). nlm_fBm. Journal of Statistical Software, 63(8), 1-25. URL http://www.jstatsoft.org/v63/i08/.

Examples

# simulate fractional brownian motion
fbm_raster <- nlm_fbm(ncol = 20, nrow = 30, fract_dim = 0.8)

if (FALSE) { # \dontrun{

# visualize the NLM
raster::plot(fbm_raster)

} # }