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I'm running into problems running the r.neighbors GRASS command in QGIS. Although it will run for small neighborhoods as soon as I increase my neighborhood above a certain number it becomes unbearably slow. I don't understand why Focal Statistics on Arcmap will do this in the blink of an eye while R.Neighbors takes ages?

  • Which statistic are you computing? – whuber Aug 11 '14 at 21:26
  • How many pixels are involved? – markusN Aug 18 '14 at 6:44

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