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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