new geom_ func 3) Visualize with ggplot2 After the presentation, I found that creating a hexagonal map as an sf object is a better solution. See https://gist.github.com/fnshr/bd752961f12dee4670d0c2ab1923e0c9 Code: https://gist.github.com/fnshr/90d204e39ee68d1278cca7a28ce380a0