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What is a good R equivalent of the GRASS function r.grow?

The closest I've been able to find is the script suggested by whuber in response to Creating randomly shaped clumps of cells in a raster from seeds of 1 cell/pixel?, which is written to address a different problem, so I'd like to know whether there are more efficient tools to simply grow outward uniformly.

  • Have you solved this? I have a feeling that you could use focal{raster} to do this... I'll give it some more thought. – si_2012 Jun 3 '14 at 8:28
  • Still haven't solved this. Best I can come up with so far is to somehow modify the code I linked to to remove randomness (not yet implemented, but seems doable). – user1521655 Jun 3 '14 at 14:33
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There is a workflow to fill in NA values by the nearest non-NA value in R here. You can easily set a maximum distance (in map units/meters).

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