% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/counties.r
\name{counties_composite}
\alias{counties_composite}
\title{Retreive a U.S. county composite map, optionally with a projection}
\usage{
counties_composite(proj = c("longlat", "laea", "lcc", "eqdc", "aeqd"))
}
\arguments{
\item{proj}{if anything but \code{longlat} is specified, the shapefile will
be pre-projected before being returned}
}
\description{
The \code{proj} parameter is intende to simplify usage for those using base
plotting. If anything but \code{longlat} is specified the composite map
will be pre-projected to those
}
\details{
This is what's in the SPDF \code{@data} slot:

\preformatted{
Observations: 3,143
Variables: 9
$ fips        (chr) "01001", "01009", "01017", "01021", "01033", "01045", "01051",...
$ state_fips  (chr) "01", "01", "01", "01", "01", "01", "01", "01", "01", "01", "0...
$ county_fips (chr) "001", "009", "017", "021", "033", "045", "051", "065", "079",...
$ name        (chr) "Autauga", "Blount", "Chambers", "Chilton", "Colbert", "Dale",...
$ lsad        (chr) "County", "County", "County", "County", "County", "County", "C...
$ census_area (dbl) 594.436, 644.776, 596.531, 692.854, 592.619, 561.150, 618.485,...
$ state       (chr) "Alabama", "Alabama", "Alabama", "Alabama", "Alabama", "Alabam...
$ iso_3166_2  (chr) "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "A...
$ population  (dbl) 54590, 57466, 34228, 43611, 54451, 50129, 79330, 15750, 34148,...
}

A reference GeoJSON file isprovided in the following location (i.e. you can use
it in any mapping program):

\preformatted{
system.file("extdata/composite_us_counties.geojson.gz", package="albersusa")
}
}
\examples{
library(sp)

plot(counties_composite())
plot(counties_composite("laea"))
}