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.
Dylan 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" /> > > CONFIDENTIALITY NOTICE: This communication is intended only for the use of > the individual or entity to which it is addressed. This message contains > information from the State of California, California Geological Survey, > which may be privileged, confidential and exempt from disclosure under > applicable law, including the Electronic Communications Privacy Act. If the > reader of this communication is not the intended recipient, you are hereby > notified that any dissemination, distribution, or copying of this > communication is strictly prohibited. -- Dylan Beaudette Soils and Biogeochemistry Graduate Group University of California at Davis 530.754.7341 _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
