conversion to polygons
On Wed, 14 Jun 2006, Luis Ridao Cruz wrote:
R-Sig-Geo help, I have an objct of class "SpatialPointsDataFrame" which I woul like to convert to polygon. I have used the following: test1<-Polygon(test) test2<-SpatialPolygons(list(test),1)
test2<-SpatialPolygons(list(Polygons(list(test)),ID=1))) should do it - there are two layers, because some "Polygons" objects with a single ID can have multiple "Polygon" object members. Roger
plot(test2,col=2,pbg="white")
but I get en error message like this:
Error in as.list(X) : cannot get a slot ("Polygons") from an object of
type "double"
I also try ploting:
plot(test1)
which gives :
Error in plot.window(xlim, ylim, log, asp, ...) :
need finite 'xlim' values
In addition: Warning messages:
1: no non-missing arguments to min; returning Inf
2: no non-missing arguments to max; returning -Inf
3: no non-missing arguments to min; returning Inf
4: no non-missing arguments to max; returning -Inf
Thank you in advance
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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