[R-sig-Geo] spplot - polygons with colored borderlines

[Roger Bivand]

On Tue, 26 May 2009, Ingo Holz wrote:

> Hi,
>
> I am using function spplot (library sp) to plot polygons:
>
> spplot(SPDF, "var", col.regions=topo.colors(100))
>
> SPDF is a SpatialPolygonsDataFrame
>
> Some of my polygons are very small and you can not see the color of the
> polygon (only the black borderlines).
>
> I could use
>
> spplot(as(SPDF, "SpatialLinesDataFrame"), "variable1",
> col.regions=topo.colors(100))
>
> to get colored borderlines.
>
> Is there a possibility to get filled colored polygons with borderlines 
> in the same color?

Although it isn't obvious, you use the col= argument passed through to 
grid.polygon() used internally - see ?gpar after loading the gris package. 
You'll find that col="transparent" is OK:

library(rgdal)
scot_BNG <- readOGR(system.file("vectors", package = "rgdal")[1],
   "scot_BNG")
spplot(scot_BNG, "SMR")
spplot(scot_BNG, "SMR", col="transparent")

Hope this helps,

Roger

>
> Thank you for your help.
> Best wishes,
> Ingo
>
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no