Adding the coastline over plot in R

Question

I need to make a map where the interpolated data is on it. My code for plotting is:

library(ggplot2)
theme_set(theme_bw())
library(sf)
library(rnaturalearth)
library(rnaturalearthdata)
library(ggthemes)
world <- ne_countries(scale = "medium", returnclass = "sf")
class(world)
ggplot(data = world)+
  geom_tile(data = d, aes(x = lon, y = lat, fill=x))+
  geom_raster(data = d, aes(x = lon, y = lat, fill=x))+
  geom_sf()+
  coord_sf(xlim=c(3,35), ylim=c(52,72))

I have received a plot like this

But I need only the countries contour to be on the plot with no difference either it is land or sea. Could ypu please help me in terms of this boarders.

You should provide a [reproducible example](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) What is `d`? — M--, Dec 16 '19 at 23:22

score 1 · Answer 1 · answered Feb 13 '23 at 11:07

You may use the function ne_coastline() if you are interested in plotting the coastlines only.

library("ggplot2")
library("sf")
library("rnaturalearth")
library("rnaturalearthdata")

world <- ne_coastline(scale = "medium", returnclass = "sf")

ggplot(world) +
  geom_sf() +
  coord_sf(xlim = c(3, 35), ylim = c(52, 72)) +
  theme_void()

M-- · Answer 2 · 2019-12-17T19:20:03.603

0

You can set the set the alpha for fill in your geom_sf, so it won't be visible. Look below;

library(ggplot2)
library(sf)
library(rnaturalearth)
library(rnaturalearthdata)
library(ggthemes)
library(rgeos)

world <- ne_countries(scale = "medium", returnclass = "sf")

ggplot() +
  geom_tile(data = d, aes(x = lon, y = lat, fill=x)) +
  geom_raster(data = d, aes(x = lon, y = lat, fill=x)) +
  geom_sf(data = world, fill=alpha("lightgrey", 0), color="lightgrey") +
  coord_sf(xlim=c(3,35), ylim=c(52,72)) + 
  theme_bw()

Here's an example only showing the world map.

ggplot() +
  geom_sf(data = world, fill=alpha("lightgrey", 0), color="lightgrey") +
  coord_sf(xlim=c(3,35), ylim=c(52,72)) + 
  theme_bw()

edited Dec 17 '19 at 19:20

answered Dec 16 '19 at 23:31

M--

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It sounds like they only want a coastline to be drawn (I think). So that'd be no `fill`, but also no internal land borders. – Axeman Dec 17 '19 at 00:15
@Axeman I though they don't want the borders at first. But it's the other way around. Using `alpha` should do the trick. – M-- Dec 17 '19 at 01:35

Adding the coastline over plot in R

2 Answers2