an address, longitude/latitude pair (in that
order), or left/bottom/right/top bounding box
zoom
map zoom, an integer from 3 (continent) to 21
(building), default value 10 (city). openstreetmaps limits a
zoom of 18, and the limit on stamen maps depends on the
maptype. "auto" automatically determines the zoom for bounding
box specifications, and is defaulted to 10 with center/zoom
specifications. maps of the whole world currently not
supported.
scale
scale argument of get_googlemap or
get_openstreetmap
maptype
character string providing map theme. options
available are "terrain", "terrain-background", "satellite",
"roadmap", and "hybrid" (google maps), "terrain", "watercolor",
and "toner" (stamen maps), or a positive integer for cloudmade
maps (see ?get_cloudmademap)
source
Google Maps ("google"), OpenStreetMap ("osm"),
Stamen Maps ("stamen"), or CloudMade maps ("cloudmade")
force
force new map (don't use archived version)
messaging
turn messaging on/off
urlonly
return url only
filename
destination file for download (file extension
added according to format)
crop
(stamen and cloudmade maps) crop tiles to bounding
box
color
color ("color") or black-and-white ("bw")
language
language for google maps
api_key
an api key for cloudmade maps
Value
a ggmap object (a classed raster object with a bounding
box attribute)