[GRASS-user] Looking for a Grass equivalent to ESRI'sFocalmean(grid, ANNULUS, irad, orad)

Moskovitz, Bob Bob.Moskovitz at conservation.ca.gov
Fri Aug 31 20:15:52 EDT 2007

Hi Glynn,

I was just looking at the CVS version of r.neighbors but didn't see where I can specify use an arbitrary neighbourhood shape unless it has something to do with the weight=string option.  Unfortunately the documentation doesn't mention how to use it.

So, with r.neighbors, how would I annulus shape neighbourhood shape?

Thanks for your help!

Bob Moskovitz
Seismic Hazard Zonation Project
California Geological Survey

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-----Original Message-----
From: Glynn Clements [mailto:glynn at gclements.plus.com]
Sent: Wednesday, August 29, 2007 7:21 PM
To: dylan.beaudette at gmail.com
Cc: grassuser at grass.itc.it; Moskovitz, Bob
Subject: Re: [GRASS-user] Looking for a Grass equivalent to
ESRI'sFocalmean(grid, ANNULUS, irad, orad)

Dylan Beaudette wrote:

> not sure if there is any simple way to compute the neighborhood stats via an 
> annulus shape, but you can use r.neighbors for a rectangular window.

The current CVS version of r.neighbors allows the use of an arbitrary
neighbourhood shape, as well as per-neighbor weights.

Glynn Clements <glynn at gclements.plus.com>

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