About the data
A spatial data object contained in tmap is called World. It is a data frame with a row for each country. The columns are the following data variables plus an additional geometry column which contains the geometries (see sf package):
names(World)
#> [1] "iso_a3" "name" "sovereignt" "continent" "area"
#> [6] "pop_est" "pop_est_dens" "economy" "income_grp" "gdp_cap_est"
#> [11] "life_exp" "well_being" "footprint" "HPI" "inequality"
#> [16] "gender" "press" "geometry"We specify this object with tm_shape (see other vignette) and for convenience assign it to s:
s = tm_shape(World, crs = "+proj=eqearth")Constant values
s + tm_polygons(fill = "#ffce00", # fill color
col = "black", # line color
lwd = 0.5, # line width
lty = "dashed") # line type
For advanced users: the default constant values are specified for combinations of visual variables and layer type. See tmap_options("value.const")
Visual variables
s + tm_polygons(fill = "press") # data variable (column in World)
s + tm_polygons(fill = "grey90") +
tm_bubbles(size = "pop_est",
fill = "well_being",
shape = "income_grp",
size.scale = tm_scale(values.scale = 3))
#> [plot mode] fit legend/component: Some legend items or map compoments do not
#> fit well, and are therefore rescaled.
#> ℹ Set the tmap option `component.autoscale = FALSE` to disable rescaling.