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

Dylan Beaudette dylan.beaudette at gmail.com
Wed Aug 29 18:36:07 EDT 2007

Hi Bob,

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.


On Wednesday 29 August 2007 15:07, Moskovitz, Bob wrote:
> Hello Grassuser,
> I am looking for a Grass equivalent to Focalmean(grid, ANNULUS, irad, orad)
> (info at
> http://edndoc.esri.com/arcobjects/9.2/NET/shared/geoprocessing/spatial_anal
>yst_tools/focalmean.htm).  What I ultimately want to do is calculate
> Topographic Position Index (info at
> http://www.jennessent.com/downloads/TPI-poster-TNC_18x22.pdf).
> Bob
> Bob Moskovitz
> Seismic Hazard Zonation Project
> California Geological Survey
> http://www.conservation.ca.gov/cgs/shzp<?xml:namespace prefix = o ns =
> "urn:schemas-microsoft-com:office:office" />
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Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis

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