Message-ID: <Pine.LNX.4.44.0606161039270.22366-100000@reclus.nhh.no>
Date: 2006-06-16T08:41:54Z
From: Roger Bivand
Subject: conversion to polygons
In-Reply-To: <s48fe98b.064@ffdata.setur.fo>
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