ggmap: Grab a map.

Description

Grab a map.

Usage

ggmap(location="houston", center=c(lat = 29.7632836, lon = -95.3632715), regularize=TRUE,
    type=c("color", "bw"), rgbcoefs=c(0, 1, 0), zoom=10, maptype="terrain", source=c("google",
    "osm"), verbose=FALSE, destfile="ggmapTemp.jpg", n_pix=640, scale=20000, ...)

Arguments

location

a character string containing the name of the location of interest

center

named numeric vector of latitude and longitude specifying the center of the image

regularize

logical; should the map grid be regularized?

type

'color' for a color map, 'bw' for a black and white map

rgbcoefs

when 'bw' is specified, conversions coefficients to use. see ?ReadImages::rgb2grey

zoom

level of zoom, an integer 0 (whole world) to 19 (higest zoom), default value 10

maptype

any of 'roadmap', 'mobile', 'satellite', 'terrain', 'hybrid', 'mapmaker-roadmap', 'mapmaker-hybrid'

source

'google' or 'osm' (OpenStreetMaps)

verbose

logical; should function message user?

destfile

character; name of file to save downloaded map

n_pix

numeric; number of pixels in map

scale

numeric; scale of OpenStreetMap, see ?GetMap

...

Value

a data.frame with columns latitude, longitude, and fill

Details

ggmap is a smart function which queries the Google Maps server or OpenStreetMap server for a map at a certain location at a certain spatial zoom.

Examples

Run this code

WashingtonMap_df <- ggmap(location = 'washington')
str(WashingtonMap_df)
# ggmapplot(WashingtonMap_df)}