County level thematic map

Uses the tmap package to generate a thematic map at the county level. Input consists of a dataframe with countyFIPS identifiers.

countyMap(
  data = NULL,
  parameter = NULL,
  state_SFDF = "USCensusStates_02",
  county_SFDF = "USCensusCounties_02",
  palette = "YlOrBr",
  breaks = NULL,
  style = ifelse(is.null(breaks), "pretty", "fixed"),
  showLegend = TRUE,
  legendOrientation = "vertical",
  legendTitle = NULL,
  conusOnly = TRUE,
  stateCode = NULL,
  projection = NULL,
  stateBorderColor = "gray50",
  countyBorderColor = "white",
  title = NULL
)

Arguments

data

Dataframe containing values to plot. This dataframe must contain a column named countyFIPS with the 5-digit FIPS code.

parameter

Name of the column in data to use for coloring the map.

state_SFDF

simple features data frame with US states. It's data @slot must contain a column named stateCode if either conusOnly = TRUE or the stateCode argument is specified.

county_SFDF

simple features data frame with US counties. It's data @slot must always contain a column named and countyFIPS and a column named stateCode if either conusOnly = TRUE or the stateCode argument is specified.

palette

Palette name or a vector of colors based on RColorBrewer or Viridis.

breaks

Numeric vector of break points.

style

Method to process the color scale.

showLegend

Logical specifying whether or not to draw the legend

legendOrientation

Orientation of the legend. Either 'vertical' or 'horizontal'

legendTitle

Text string to use as the legend title.

conusOnly

Logical specifying Continental US state codes. Ignored when the stateCode argument is specified.

stateCode

Vector of state codes to include on the map.

projection

Specified method to represent surface of Earth.

stateBorderColor

Color used for state borders.

countyBorderColor

Color used for county borders.

title

Text string to use as the plot title.

Value

A ggplot object.

Details

See tmap::tm_fill() for a more detailed description of the following parameters:

• palette

• breaks

Note

Color palettes can be chosen from either RColorBrewer or Viridis. See tmaptools::palette_explorer() for a list of available palletes.

Examples

# \donttest{
library(MazamaSpatialPlots)

countyMap(
  data = example_US_countyCovid,
  parameter = "cases",
  breaks = c(0,100,200,500,1000,2000,5000,10000,20000,50000,1e6),
  title = "COVID-19 Cases on June 01 2020"
)


countyMap(
  data = example_US_countyCovid,
  parameter = "deaths",
  state_SFDF = USCensusStates_02,
  county_SFDF = USCensusCounties_02,
  palette = "OrRd",
  breaks = c(0, 1, 50, 100, 250, 500, 1000, 2500, 3000),
  stateCode = c( "NY", "PA", "MD", "NJ", "DE"),
  stateBorderColor = "black",
  countyBorderColor = 'grey70',
  title = "COVID-19 Deaths* in the Mid Atlantic"
) +
  tmap::tm_layout(
    main.title.size = 1.2,
    main.title.color = "white",
    attr.color = 'white',
    bg.color = "dodgerblue4"
  ) +
  tmap::tm_credits("*as of June 01, 2020", col = "white", position = "left")

# }