Dot Density Maps

Generate point data for representing people within spatial data. This collects a suite of tools for creating simple dot density maps. Several functions from different spatial packages are standardized to take the same arguments so that they can be easily substituted for each other.

dots

CRAN downloads

dots provides tools to make dot density maps.

Installation

You can install the stable version of dots from CRAN with:

install.packages('dots')

You can install the development version of dots from GitHub with:

remotes::install_github('christopherkenny/dots')

Example

The main function in dots is dots().

library(dots)
library(sf)
#> Linking to GEOS 3.13.1, GDAL 3.11.0, PROJ 9.6.0; sf_use_s2() is TRUE
library(ggplot2)
data('suffolk')
dots::dots(suffolk, c(pop_black, pop_white), divisor = 1000, engine = engine_sf_random) + 
  scale_color_viridis_d() + 
  theme_void()

You can also use dots_points() to only make the randomized points.

dots::dots_points(suffolk, c(pop_black, pop_white), divisor = 1000, engine = engine_sf_random) |> 
  ggplot() + 
  geom_sf(data = suffolk) + 
  geom_sf(aes(color = dots_type)) + 
  scale_color_viridis_d() + 
  theme_void()