[R-sig-Geo] finding points outside but very near a polygon

[Medina, Hernan]

I used the code below to find points in a North American Regional
Reanalysis data set that were within the 48 contiguous states.  

# The 48 contiguous states
m <- map("state",fill=TRUE,plot=FALSE)
indx1 <- in.polygon(m,list(x=my_lon,y=my_lat))
st <- map.where("state",my_lon,my_lat)

Unfortunately, this leaves out points that are over water.  For some of
the counties around Seattle Washington, I missed some of the points.  Is
there a way to find points that are just a little bit outside the border
of the polygon?

Hernan L. Medina

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