[R-sig-Geo] Current location of the Srings object (or its replacement)?

[Roger Bivand]

On Wed, 21 Dec 2005, Edzer J. Pebesma wrote:

> Rick, this change has been done a while back already --
> substitute:
> Srings with Polygons
> Sring with Polygon
> 
> see also the article about sp in the latest R-News issue.

The reason for the incompatibility, as we wrote at the time, was to reduce 
the number of copies of metadata carried around by lines and polygons.

If you happen to have stored objects in SRings format, remove the current 
sp, install the older version - the source can be downloaded from:

http://cran.r-project.org/src/contrib/Archive/S/

and Windows binary for example from:

http://cran.univ-lyon1.fr/bin/windows/contrib/2.1/

and your old spmaptools, write as a shapefile, and read in again after 
replacing old sp with the current one. I've had to do this, so I guess I'm 
not the only person who finds out that data from a terminated project 
needs to be revisited.

Hope this helps,

Roger

> 
> Best regards,
> --
> Edzer
> 
> Rick Reeves wrote:
> 
> >Hello all:
> >
> >Following is a code sample that used the Srings class,
> >and which used to work before I upgraded to the
> >latest build of the 'sp' package and removed the
> >spmaptools package from my build.
> >
> >Now, running this code generates the error:
> > 
> >Error: couldn't find function "Srings".
> >Even loading the spmaptools package does
> >not resolve this problem.
> >
> >Any suggestions on resolving this issue?
> >
> >Thanks, Rick Reeves
> >
> >
> >
> >Now, R reports that
> ># ----------start -------------------
> >
> >#
> >   Srsl <- vector(mode="list", length=length(AllSps))
> >#
> ># Srings object comes from sp package
> >#
> >   for (iCtr in 1:length(AllSps))
> >   {
> >      Srsl[[iCtr]] <- Srings(list(Sring(AllSps[[iCtr]])), 
> >names(AllSps)[iCtr])
> >      if ((iCtr %% 50) == 0)
> >          print(sprintf("....Srings() call for AllSps: %d done...",iCtr))
> >   }
> >#
> >print("....Srings object is made....")
> >#browser()
> >   SpShapes <- SpatialRings(Srsl, pO=1:SpListCount)
> >print("....SpShapes Spatial Rings object is made...plot them....")
> >#browser()
> >plot(SpShapes,col = "orange")
> >
> ># ----------end-------------------
> >
> >
> >  
> >
> 
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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