yes dropping points was my first solution. But there are quite a number along the cost... what i want at the end is to compute the distance from each of my points to the nearest "ocean coastline", and my solution was to get a simplified coast line and compute the distance from that using bdist.points(). Maybe someone has a better suggestion on another way to do this
________________________________ Da: Barry Rowlingson <b.rowling...@lancaster.ac.uk> A: "r-sig-geo@r-project.org" <r-sig-geo@r-project.org> Inviato: Giovedì 4 Ottobre 2012 15:16 Oggetto: Re: [R-sig-Geo] simplify a polygon window > Hi, > > I am working with a point pattern whose window is a spatial polygon which > describe the cost of Norway. > > I need to get a smoother version of such polygon which wraps the original one. You mean 'coast' of Norway? You want to undo all Slartibartfast's good [[elided Yahoo spam]] http://en.wikipedia.org/wiki/Slartibartfast > I have tried to use the function > >> simplify.owin(my.owin,80000) > but this does not work since some parts of the original polygon will lay > outside the simplified one. > > Does anyone know how to do that? You could use the buffering functions in rgeos to expand the area slightly - but that might end up making the polygon more complex again. You could possibly also use an alpha-shape instead of whatever polygon you have: http://procomun.wordpress.com/2011/04/07/alpha-shapes-with-lattice/ but at that point you are probably throwing away the concept that the polygon is the window in which your process occurs. In which case your analysis becomes problematic. Are you losing points after the simplification? You could just drop them. _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo [[alternative HTML version deleted]]
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