[R] Creating World Map with Points

[Giorgio Garziano]

I had to update low/up longitude and latitude attributes of the zoom=1 map
with those of zoom=2 map.

library(ggmap)

# the zoom=2 map works with ggmap(), however it does not show Americas and all Pacific Ocean

map <- get_map(location = 'India', zoom=2)
bb <- attr(map, "bb")
bb

# the zoom=1 shows all entire world

map <- get_map(location = 'India', zoom=1)
attr(map, "bb")

# changing latitude and longitude upper and lower bounds
attr(map, "bb") <- bb
bb

# now your code
n <- 1000
set.seed(1234)
long <- runif(n,-180, 180)
lat <- runif(n,-90, 90)
size <- runif(n, 1,5)
data <- cbind(long, lat, size)
data <- as.data.frame(data)

gpl <- ggmap(map) +
  geom_point(data = data, aes(x = long, y = lat), size=data$size,
             alpha=1, color="blue", show.legend  = F)
plot(gpl)


--
Giorgio Garziano


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