On Tue, 26 May 2009, Ingo Holz wrote:
Hi Roger,
thank you for your reply. After sending my email to R-sig-Geo I recognized
that you answered a similar question somedays ago.
However, if I use col = "transparent" some of my polygons are only "colored
dots in the space".
Is there no posibility to get filled colored polygons and colored borders?
I believe that grid.polygon() as used in spplot() fills to the exact
polygon boundary, so adding coloured boundary lines might only add a pixel
in some places on some devices, half a point line width on vector devices.
So if the polygons are only "dots", then that is simply their size. In
spplot() I do not think that extracting and passing a colour vector is
easy. It could be done with base graphics, but the plot order of the
contiguous polygons would determine which got the extra pixels, and which
got overpainted. I think that col="transparent" is about as much as you
can get, really.
Roger
Thank you,
Ingo
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.biv...@nhh.no
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