[R-sig-Geo] R function to match closest points to second point set?

[Rick Reeves]

Hello all:

I checked inside most of the R spatial analysis packages, without success,
so I'll ask the list:

I have a set of data collection points georeferenced with lat/long 
coordinates.
The task is to find the closest (in lat/long) matching point in a second 
set of
points (polygon centroids, that I created with R get.Pcent() function).
both point sets are stored in data frames, I would like to record the
index of the matching point as a new column on the first data frame.

Is there an existing R function or package that would support this, or 
get close?
Thanks for any assistance.

Thanks,
Rick R

-- 
Rick Reeves	
Scientific ProgrammerAnalyst
National Center for Ecological Analysis and Synthesis (NCEAS)
University of California, Santa Barbara
reeves at nceas.ucsb.edu
805 892 2533