RgoogleMaps (version 1.5.1)

genStaticMap: generates a "static map" from map tiles by "stitching" them together

Description

necssary because the Google static maps API requires a key now

Usage

genStaticMap(center, zoom = 15, size = c(640, 640), 

    destfile = tempfile("staticMap", fileext = ".png"), 

    type = c("google", "google-m", "google-s", "osm", 

        "osm-hot", "stamen-toner", "stamen-terrain", 

        "stamen-watercolor")[1], urlBase = "http://mt1.google.com/vt/lyrs=m", 

    tileDir = "/tmp/", tileExt = ".png", verbose = 0, 

    ...)

Value

list with tiles

Arguments

center

optional center

zoom

zoom

size

size (in pixels) of "stitched" map

destfile

File to load the map image from or save to, depending on NEWMAP.

type

choice of tile server

urlBase

tileserver URL, alternatives would be "http://a.tile.openstreetmap.org/", "http://tile.stamen.com/toner/","http://tile.stamen.com/watercolor/"

tileDir

map tiles can be stored in a local directory, e.g. "~/mapTiles/Google/"

tileExt

image type of tile

verbose

level of verbosity

...

further arguments to be passed to FUN

Author

Markus Loecher

Examples

if (0){


  lat = c(40.702147,40.718217,40.711614);


  lon = c(-74.012318,-74.015794,-73.998284);


  center = c(mean(lat), mean(lon));


  zoom <- min(MaxZoom(range(lat), range(lon)));


  bb=qbbox(lat,lon)


  


  mt = GetMapTiles(latR =bb$latR , lonR=bb$lonR,zoom=zoom,verbose=1)


  PlotOnMapTiles(mt,lat=lat,lon=lon,pch=20,col=c('red', 'blue', 'green'),cex=2)


  


  mt = GetMapTiles(latR =bb$latR , lonR=bb$lonR,zoom=zoom,


                   tileDir= "~/mapTiles/Google/")


  PlotOnMapTiles(mt,lat=lat,lon=lon,pch=20,col=c('red', 'blue', 'green'),cex=2)


  


}