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

[Moskovitz, Bob]

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_analyst_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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