coord_map()

[Vikas Rawal]

I am trying to create a map using ggplot2 but am having trouble with projections.

The following code (taken from http://docs.ggplot2.org/current/coord_map.html) shows what is going wrong:

world <- map_data("world")

worldmap <- ggplot(world, aes(x=long, y=lat, group=group)) +

  geom_path() +

  scale_y_continuous(breaks=(-2:2) * 30) +

  scale_x_continuous(breaks=(-4:4) * 45)

##The following like produces attached Figure 1

worldmap

##The following like produces attached Figure 2

worldmap+ coord_map()

When I use projections, strange horizontal lines appear. Why is that? I am having similar trouble with a set of chloropleth maps that I am trying to make. With chloropleth maps, I get horizontal bands of colour.

Would be grateful if somebody could point out what am I doing wrong.

Vikas

[David Reichel]

Hi,

You could try to add limits to the coord_map function. See last line:

world <- map_data("world")
worldmap <- ggplot(world, aes(x=long, y=lat, group=group)) +
  geom_path() +
  scale_y_continuous(breaks=(-2:2) * 30) +

  scale_x_continuous(breaks=(-4:4) * 45) +
  coord_map(xlim=c(-180,180))

Best,
David

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[Raza Khan]

Dear all

I wish to work on maps, maptools etc in R. though i has already downloaded it. could any body tell which version of R could run it and also the map sites/library to download.

Cheers

Raza