Hi Roosbeh,

one way to that is:

## a=SpatialPointsDataFrame
## b= SpatialPolygonsDataFrame


pts <- list("sp.points",a[,"column_to_map"])
spplot(b[,"column_to_map"],sp.layout=list(pts))

in the first line you can add parameters cex, pch, col,... In the second
line you can add parameters such as col.regions,... to make a map like as
you need

Hope this help


Sam


On Mon, Jul 16, 2012 at 3:57 PM, Roosbeh Nowrouzian <
roosbeh.nowrouzian@gmail.com> wrote:

> Dear List members:
>
> I have plotted a  SpatialPointsDataFrame (originated from GWR estimation)
> using spplot function. I need to add
> county boundaries(a SpatialPolygonsDataFrame ) of the points where
> they belong to. I can plot these two spatial data frame separately but how
> can I show the spplot of SpatialPointsDataFrame which shows the value of
> the points in space and plot of a SpatialPolygonsDataFrame which
> represent county boundaries at one plot.
>
>
> Thanks in advance
>
> Roosbeh
> Department of Civil and Coastal Engineering
> PhD student University of Florida
>
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