Get bounding box from ggmap object

Question

I am using the ggmap library in R. I am trying to load a rectangular map with it, but I know that this will give me a square. I only need the bounding box of the returned square.

library(ggmap)
map <- get_map(c(-65.7,-3.1,-64.4,-2.3),maptype="satellite",filename="map.png")
str(map)

 chr [1:1280, 1:1280] "#294829" "#294829" "#2D512D" "#264425" ...
 - attr(*, "class")= chr [1:2] "ggmap" "raster"
 - attr(*, "bb")='data.frame':  1 obs. of  4 variables:
  ..$ ll.lat: num -3.14
  ..$ ll.lon: num -65.5
  ..$ ur.lat: num -2.26
  ..$ ur.lon: num -64.6

The object map has two classes: "ggmap" and "raster". I can not use @ or $ in it. How then can I access ll.lat and other attributes from the "bb" sub-object?

Answer 1

You can do it:

> attr(map, "bb")
     ll.lat    ll.lon    ur.lat    ur.lon
1 -3.139567 -65.48877 -2.261646 -64.60986