sets spatial coordinates to create spatial data, or retrieves spatial coordinates
sets spatial coordinates to create spatial data, or retrieves spatial coordinates
polygons(obj) polygons(object) <- value
obj |
object of class "SpatialPolygons" or "SpatialPolygonsDataFrame" |
object |
object of class "data.frame" |
value |
object of class "SpatialPolygons" |
polygons returns the SpatialPolygons of obj; polygons<- promotes a data.frame to a SpatialPolygonsDataFrame object
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 df <- data.frame(x=x, y=y, z=z, row.names=row.names(polys)) polygons(df) <- polys class(df) summary(df)
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