map_counties: Map counties

In geanders/hurricaneexposure: Explore and Map County-Level Hurricane Exposure in the United States

Description

Map counties

Usage

map_counties(
  storm,
  metric = "distance",
  wind_var = "vmax_sust",
  days_included = c(-2, -1, 0, 1),
  add_track = TRUE,
  wind_source = "modeled"
)

Arguments

storm	Character string giving the name of the storm to plot (e.g., "Floyd-1999")
metric	Character string giving the metric to plot. Current options are "distance", "wind", and "rainfall". These options are used to customize the color palette and scale of the choropleth map produced by this function.
wind_var	A character string giving the wind variable to use. Choices are "vmax_sust" (maximum sustained winds; default), "vmax_gust" (maximum gust winds), "sust_dur" (minutes of sustained winds of 20 m / s or higher) and "gust_dur" (minutes of gust winds of 20 m / s or higher). If the Extended Best Tracks wind radii are used as the source of wind data, the "gust_dur" option cannot be selected.
days_included	A numeric vector listing the days to include when calculating total precipitation. Negative numbers are days before the closest date of the storm to a county. For example, c(-1, 0, 1) would calculate rain for a county as the sum of the rainfall for the day before, the day of, and the day after the date when the storm center was closest to the county center. Values can range from -5 to 3 (i.e., at most, you can calculate the total rainfall from five days to three days after the day when the storm is closest to the county).
add_track	TRUE / FALSE of whether to add the storm's track to the map. The default is TRUE.
wind_source	A character string specifying the source to use for the winds. Options are "modeled", for estimates based on running a wind model from Best Tracks data inputs, and "ext_tracks", for estimates based on the wind radii in the Extended Best Tracks data. See the help files for the datasets storm_winds and ext_tracks_wind in the hurricaneexposuredata package for more details on each of these sources for wind estimates. For the gust wind estimates, these are based on applying a gust factor of 1.49 to the sustained wind estimates in both wind data sources.

Value

This function creates a choropleth map of counties in the eastern part of the United States, showing distance from a storm track, maximum wind speed (or duration of winds at or above 20 m / s), or total rainfall over a given window of one or more days near the date of the storm's closest approach.

Examples

# Ensure that data package is available before running the example.
#  If it is not, see the `hurricaneexposure` package vignette for details
# on installing the required data package.
if (requireNamespace("hurricaneexposuredata", quietly = TRUE)) {

map_counties("Floyd-1999", metric = "rainfall", days_included = c(-2, -1, 0, 1))

map_counties("Katrina-2005", metric = "wind")
map_counties("Katrina-2005", metric = "wind", wind_var = "vmax_gust")
map_counties("Katrina-2005", metric = "wind", wind_var = "sust_dur")
map_counties("Katrina-2005", metric = "wind", wind_source = "ext_tracks")

#' map_counties("Michael-2018", metric = "wind")
map_counties("Michael-2018", metric = "wind", wind_var = "vmax_gust")
map_counties("Michael-2018", metric = "wind", wind_source = "ext_tracks")
}

geanders/hurricaneexposure documentation built on Feb. 16, 2020, 8:19 a.m.