[R-sig-Geo] sampling a raster using sample points

[Robert Hijmans]

> Does anyone have any suggestions on sampling a raster (NLCD land cover 
> map, 30 m res) using circular buffers centered on 100+ sample points? 

You can do:

library(raster)
r <- raster('filename')
extract(r, points, buffer=250)

where points is a two column matrix (x,y), or (inherits from) a
SpatialPoints object

Robert
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