Grab a map.

Description

get_map is a smart wrapper that queries the Google Maps, OpenStreetMap, Stamen Maps or Naver Map servers for a map.

Usage

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get_map(location = c(lon = -95.3632715, lat = 29.7632836), zoom = "auto",
  scale = "auto", maptype = c("terrain", "terrain-background", "satellite",
  "roadmap", "hybrid", "toner", "watercolor", "terrain-labels", "terrain-lines",
  "toner-2010", "toner-2011", "toner-background", "toner-hybrid",
  "toner-labels", "toner-lines", "toner-lite"), source = c("google", "osm",
  "stamen", "cloudmade"), force = ifelse(source == "google", TRUE, TRUE),
  messaging = FALSE, urlonly = FALSE, filename = "ggmapTemp",
  crop = TRUE, color = c("color", "bw"), language = "en-EN", api_key)

Arguments

location

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)

Author(s)

David Kahle david.kahle@gmail.com

See Also

ggmap, GetMap in package RgoogleMaps

Examples

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map <- get_map()
map
str(map)
ggmap(map)

## Not run: 
# not run by check to reduce time; also,
# osm may error due to server overload

(map <- get_map(maptype = "roadmap"))
(map <- get_map(source = "osm"))
(map <- get_map(source = "stamen", maptype = "watercolor"))

map <- get_map(location = "texas", zoom = 6, source = "stamen")
ggmap(map, fullpage = TRUE)


## End(Not run)

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