What is the method for concealing the ocean when creating a globe plot with ggplot in R, while displaying the plotted values?

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One method for concealing the ocean when creating a globe plot with ggplot in R while displaying the plotted values is to use the map_data() function from the ggplot2 package to obtain a dataset of landmasses only. This can be done by specifying the region argument in map_data() to a specific continent, such as region = "world" or region = "north america".

Once the landmass data is obtained, it can be used to create a polygon layer in ggplot that only displays land areas. For example:

library(ggplot2)

# Get data for landmasses only
world <- map_data("world") 

# Create ggplot with only land areas
ggplot() + 
  theme_void() + 
  geom_polygon(data = world, 
               aes(x = long, y = lat, group = group), 
               fill = "gray80")

This will create a blank gray globe with only landmasses displayed, which can then be overlaid with the desired plot data.