Why does coord_map produce a weird output?

Question

I\'m trying to draw a world map using ggplot. My code is in my gist file. The output is correct when I don\'t use coord_map but very strange when I use

Answer 1

Another solution is to use wrld_simpl from maptools instead, but it retains issues with Antarctica.

require(maptools)
require(ggmap)

md <- map_data("world2")
data(wrld_simpl)
ggplot(wrld_simpl, aes(group = group, x = long, y = lat)) +
  geom_map() +
  coord_map()

Answer 2

I'm sure that is quite late but the same problem is still happening in ggplot.

If you're trying to zoom-in use the following approach.

ggplot()+...+xlim(c(-100, -25))+ ylim(c(-60, 20))

Good luck!

Answer 3

I had a similar problem before, due to longitude values outside the range [-180,180]. In your example the data do not have this problem but my trick seems to work also here. In my case I just used 'xlim' to exclude the problematic data.

This solution seems to work in your case also (I used the code from your gist):

map+coord_map(xlim=c(-180,180))

It produces the following map:

There is still a problem with Antarctica, you can also consider clipping it too if you don't need this area:

map+coord_map(xlim=c(-180,180), ylim=c(-60, 90))