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

Brad Douglas rez at touchofmadness.com
Fri Aug 31 23:22:34 EDT 2007

On Fri, 2007-08-31 at 17:15 -0700, Moskovitz, Bob wrote:
> 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.

That would be Glynn's documentation skills at work. :-)  I'll try to
correct that.

Yes, you use the 'weight=' option.

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

r.neighbors in=input.map out=output.map size=3 weight=weight.file

weights.file should contain something along the lines of:
3 3 3 1 4 8 9 5 3

> Thanks for your help!
> Bob
> Bob Moskovitz
> Seismic Hazard Zonation Project
> California Geological Survey
> http://gmw.consrv.ca.gov/shmp
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such thing as express or implied confidentiality here. :-)

Brad Douglas <rez touchofmadness com>                    KB8UYR/6
Address: 37.493,-121.924 / WGS84    National Map Corps #TNMC-3785

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