random_habitat: Simulate a Random Habitat
In petrelharp/landsim: Simulate Populations on Landscapes

Simulates a random habitat, with holes and varying carrying capacity.

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random_habitat(diam = 20000, res = 100, randfun = function(n) pmin(20, (2
  + rcauchy(n))), kern = "gaussian", sigma = 300, radius = 1500,
  width = diam, height = diam)

`diam`	Diameter of the desired habitat (in real units, not number of cells).
`res`	Spatial resolution of the Raster.
`randfun`	Function used to sample values for the habitat (negative values will be set to NA).
`kern`	Smoothing kernel.
`sigma`	Smoothing kernel scale.
`radius`	Smoothing kernel maximum radius.
`width`	Width of the region (default: diam).
`height`	Height of the region (default: diam).