Proportional-symbol (bubble) map — bubble

Plots sized circles at country centroids – the right idiom for totals (population, total emissions, total GDP), which a choropleth misrepresents because big values hide in small countries and vice versa.

Usage

bubble_map(
  data,
  size,
  color = NULL,
  projection = "equal_earth",
  backend = c("polygon", "sf"),
  max_size = 18,
  alpha = 0.7
)

Arguments

data: A country-level frame with iso3c and the size column.
size: The column controlling bubble size (unquoted).
color: Optional column controlling bubble colour (unquoted).
projection: Projection for the base map (sf path). See world_map() for the projections available.
backend: "polygon" (default) or "sf" for the base map.
max_size: Largest bubble size.
alpha: Bubble transparency.

Value

A ggplot object.

Examples

# \donttest{
snap <- countryatlas::world_snapshot$countries
if (requireNamespace("maps", quietly = TRUE)) {
  bubble_map(snap, population)
}
#> Warning: population: 5 countries are not drawn -- no bundled centroid.
#> • "GIB", "HKG", "MAC", "TUV", and "VGB"
#> ℹ They are counted as missing in the caption and in `map_provenance()`.

# }