Make a map with a group of subregions with geom_sf

Question

I want to make a map only with the external borders by groups of subregions. Bellow are plotted all the subregions and I want to make a map but only with the external borders of the regions which are in region column in the spain object. I have tried with several aes like fill and group or even grouping by before plotting it but can't find a proper way:

library(rnaturalearth)
library(tidyverse)

spain <- ne_states(country = "spain", returnclass = "sf")

spain %>% 
  ggplot() +
  geom_sf()

^{Created on 2019-02-12 by the reprex package (v0.2.1)}

Just to clarify regions are a group of printed shapes in the map above:

spain %>% 
  ggplot(aes(fill = region)) +
  geom_sf() +
  theme(legend.position = "none")

^{Created on 2019-02-12 by the reprex package (v0.2.1)}

As proposed bellow `summarise` did the work. Thanks @camille for the support by second time :) — Tito Sanz, Feb 12 '19 at 22:07

score 2 · Accepted Answer · answered Feb 12 '19 at 21:59

2

Both group_by and st_union are options:

spain %>% 
  group_by(region) %>% 
  summarise() %>% 
  ggplot(aes(fill = region)) +
  geom_sf() +
  theme(legend.position = 'none')

answered Feb 12 '19 at 21:59

astrofunkswag

2,608
12
25

Use `summarise` in this case is something that I would never imagine... but somehow it works! Thanks @astrofunkswag ! – Tito Sanz Feb 12 '19 at 22:03

Make a map with a group of subregions with geom_sf

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