tigris (version 0.8.2)

coastline: Download a shapefile of the US coastline into R

Description

Download a shapefile of the US coastline into R

Usage

coastline(year = NULL, ...)

Arguments

year

The year of the dataset (defaults to 2017)

...

arguments to be passed to the underlying `load_tiger` function, which is not exported. Options include class, which can be set to "sp" (the default) or "sf" to request sp or sf class objects, and refresh, which specifies whether or not to re-download shapefiles (defaults to FALSE).).

See Also

Other water functions: area_water, linear_water

Examples

# NOT RUN {
library(tigris)
library(ggplot2)
library(ggthemes)
library(rgeos)
library(sp)

coast <- coastline()

# ggplot really doesn't like a ton of detailed lines so
# we use rgeos::gSimplify to get the structure to a reasonable size
# but we also lose the SpatialLinesDataFrame, so re-bind the
# data from the original spatial structure so we can use fortify

coast_simp <- gSimplify(coast, tol=1/200, topologyPreserve=TRUE)
coast_simp <- SpatialLinesDataFrame(coast_simp, coast@data)

coast_map <- fortify(coast_simp)

gg <- ggplot()
gg <- gg + geom_map(data=coast_map, map=coast_map,
                    aes(x=long, y=lat, map_id=id),
                    color="black", fill="white", size=0.25)
gg <- gg + coord_map(xlim=c(-125.0011, -66.9326),
                     ylim=c(24.9493, 49.5904))
gg <- gg + theme_map()
gg
# }