polygons: sets spatial coordinates to create spatial data, or retrieves...

polygonsR Documentation

sets spatial coordinates to create spatial data, or retrieves spatial coordinates

Description

sets spatial coordinates to create spatial data, or retrieves spatial coordinates

Usage

	polygons(obj)
	polygons(object) <- value

Arguments

obj

object of class "SpatialPolygons" or "SpatialPolygonsDataFrame"

object

object of class "data.frame"

value

object of class "SpatialPolygons"

Value

polygons returns the SpatialPolygons of obj; polygons<- promotes a data.frame to a SpatialPolygonsDataFrame object

Examples

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)

sp documentation built on June 7, 2022, 1:10 a.m.