UScensus2010 (version 0.20.0)

areaPoly: Area of the polygons in SpatialPolygonsDataFrame

Description

Calculates the area of each polygon in SpatialPolygonsDataFrame.

Usage

areaPoly(sp.object=NULL)

Arguments

sp.object

SpatialPolygonsDataFrame, must be a SpatialPolygonsDataFrame object.

Value

a numeric vector.

References

Zack W. Almquist (2010). US Census Spatial and Demographic Data in R: The UScensus2000 Suite of Packages. Journal of Statistical Software, 37(6), 1-31. https://www.jstatsoft.org/v37/i06/.

Also see: SpatialPolygonsDataFrame

Examples

# NOT RUN {
data(oregon.county10)



## Build density using areaPoly()
den00<-oregon.county10$P0010001/areaPoly(oregon.county10)
oregon.county10$den00<-den00

choropleth(oregon.county10,"den00",

color = list(fun = "rainbow", 

attr = list(4)),

main="2010 US Counties \n Oregon",type="plot",border="transparent")
# }
# NOT RUN {



# }