Created
January 17, 2018 09:05
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This is a small fix of Carson Farmer's Voronoi Polygons function (http://carsonfarmer.com/2009/09/voronoi-polygons-with-r/) which also copies the input points layer's CRS string over to the output polygons.
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| voronoipolygons = function(layer) { | |
| require(deldir) | |
| crds = layer@coords | |
| z = deldir(crds[,1], crds[,2]) | |
| w = tile.list(z) | |
| polys = vector(mode='list', length=length(w)) | |
| require(sp) | |
| for (i in seq(along=polys)) { | |
| pcrds = cbind(w[[i]]$x, w[[i]]$y) | |
| pcrds = rbind(pcrds, pcrds[1,]) | |
| polys[[i]] = Polygons(list(Polygon(pcrds)), ID=as.character(i)) | |
| } | |
| SP = SpatialPolygons(polys, proj4string = layer@proj4string) | |
| voronoi = SpatialPolygonsDataFrame(SP, | |
| data = data.frame(x=crds[,1], | |
| y=crds[,2], | |
| row.names=sapply(slot(SP, 'polygons'), | |
| function(x) slot(x, 'ID')))) | |
| } |
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