Extending plot_usmap with ggplot2
The nice thing about usmap::plot_usmap is it returns a ggplot object object, which means we can add ggplot layers to the plot right out of the box.
library(usmap)
library(ggplot2)
plot_usmap(regions = "counties") +
labs(title = "US Counties",
subtitle = "This is a blank map of the counties of the United States.") +
theme(panel.background = element_rect(color = "black", fill = "lightblue"))
Plot only certain states
library(usmap)
library(ggplot2)
plot_usmap(include = c("CA", "ID", "NV", "OR", "WA")) +
labs(title = "Western US States",
subtitle = "These are the states in the Pacific Timezone.")
Add some data to the map
library(usmap)
library(ggplot2)
plot_usmap(data = statepop, values = "pop_2015", color = "red") +
scale_fill_continuous(name = "Population (2015)", label = scales::comma) +
theme(legend.position = "right")
Notice the comprehensive expandability that can be applied to the map using ggplot2 layers. For example, we might want to use a different color scheme.
Change fill color scale
library(usmap)
library(ggplot2)
plot_usmap(data = statepop, values = "pop_2015", color = "red") +
scale_fill_continuous(
low = "white", high = "red", name = "Population (2015)", label = scales::comma
) + theme(legend.position = "right")
The data-filled map can also be filtered to show certain regions only, like the western states shown above.
Show data in certain states
library(usmap)
library(ggplot2)
plot_usmap(
data = statepop, values = "pop_2015", include = c("CA", "ID", "NV", "OR", "WA"), color = "red"
) +
scale_fill_continuous(
low = "white", high = "red", name = "Population (2015)", label = scales::comma
) +
labs(title = "Western US States", subtitle = "These are the states in the Pacific Timezone.") +
theme(legend.position = "right")
