[R-sig-Geo] object of SpatialPolygonsDataFrame from several objects of the class

[Roger Bivand]

On Fri, 17 Sep 2010, Berta Ibáñez wrote:

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> Dear R-users,
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> I am trying to built a shp file of the class SpatialPolygonsDataFrame 
> using several shps. After handling the objects, I have 20 objects of the 
> class SpatialPolygonsDataFrame (some are SpatialPolygons only) and I 
> want to built one object (one shp) that is the result of gathering all 
> shps but conserving the borders (that is, I cannot use 
> unionSpatialPolygons). I want to plot the final objetc in a given order, 
> so that if I am able to convert it in a spatialpolygondataframe, I guess 
> I can use slot(globalshp,"plotOrder").


No, avoid using internal slots unless you know what you are doing. See 
spRbind() methods in maptools, and use it sequentially, after making sure 
that the row.names() of the objects to be combined are not duplicated 
(they must be unique in the combined object).

Hope this helps,

Roger

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> Thanks a lot in advance,
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> Berta
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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