[R] how to get points from SpatialPolygonsDataFrame

[Jarek Jasiewicz]

Milton Cezar Ribeiro wrote:
> Dear all,
>
> I need to get all points for each polygons and save these points in a data.frame. I tryed to use the slot() function, but I can´t access the "coords". 
>
> grd <- GridTopology(c(1,1), c(1,1), c(10,10))
> polys <- as.SpatialPolygons.GridTopology(grd)
> centroids <- coordinates(polys)
> x <- centroids[,1]
> y <- centroids[,2]
> z <- 1.4 + 0.1*x + 0.2*y + 0.002*x*x
> ex_1.7 <- SpatialPolygonsDataFrame(polys, data=data.frame(x=x, y=y, z=z, row.names=sapply(slot(polys, "polygons"), function(i) slot(i, "ID"))))
> ex_1.7.selected<-ex_1.7[1,]
> slot(ex_1.7.selected,"coords")
>
> Any idea?
>
> Kind regards,
>
> Miltinho
>
>
>
>  para armazenamento!
>
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>
>   
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probably as.data.frame(spPointsDataFrame) will help
look maptools package
Jarek