RSAGA Vectorizing Grid Classes creates unclosed rings
Roger Bivand <Roger.Bivand <at> nhh.no> writes:
On Tue, 11 May 2010, manuel.schneider <at> art.admin.ch wrote:
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Error in is.vector(X) : ring not closed
http://shapelib.maptools.org/dl/shapefile.pdf does specify that a polygon in a shapefile must be closed. You may be able to use readShapePoly(..., force_ring=TRUE) in maptools to work around the problem. Roger
As always, your suggestion does the trick. Thanks a lot. However, still puzzled why it occurs.