R: Use real lon/lat values at x and y axis-CodePudding

I've generated the following chart with R:

library(rnaturalearth)
library(rnaturalearthdata)
library(ggplot2)
library(rworldmap)
library(scales)
library(sf)
library(mapdata)
library(maptools)
library(ggthemes)

data(wrld_simpl)

antarctica <- wrld_simpl[wrld_simpl$NAME == "Antarctica", ]
pr <- " proj=laea  lat_0=-90  ellps=WGS84  datum=WGS84  no_defs  towgs84=0,0,0"
antarctica.laea <- spTransform(antarctica, CRS(pr))

antarctica_plot <- ggplot()  
  geom_polygon(data = antarctica.laea, aes(x=long, y=lat, group=group), fill = '#003f5c')  
  labs( x = "Longitude", y = "Latitude")  
  annotation_scale(location = "bl", width_hint = 0.5)  
  annotation_north_arrow(location = "bl", which_north = "true", 
                         pad_x = unit(0.75, "in"), pad_y = unit(0.5, "in"),
                         style = north_arrow_fancy_orienteering)  
  theme_wsj()

antarctica_plot

How can I display the real latitude and longitude values on my axis?

CodePudding user response：

You can solve this transforming the spatial polygon (sp) to simple feature class (sf) and using the geom_sf instead geom_polygon. I couldnt find the functions annotation_scale and annotation_north_arrow in any of those packages btw...

antarctica.laea <- st_as_sf(antarctica.laea)
        
    ggplot(antarctica.laea)  
      geom_sf(aes(), fill = '#003f5c') 
      labs( x = "Longitude", y = "Latitude")  
      theme_wsj()