interpolating sites

[Christine Weiss]

Hello Grass Users,

Does GRASS have the capability to interpolate one site from multiple sites?  I want to "average" the sites, so to speak, of where wildlife was spotted to give me one site for each species surveyed within a given range.   

Up till now, this has been done manually by techs who visually "averaged" the clusters of wildlife to determine the one point.  There's got to be an easier way.  
Any pointers would be much appreciated.  Thanks,

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Christine Weiss				
NYC Dept. Parks & Recreation
Natural Resources Group
cmw at nycparks.gov
(212) 360-2749