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

In RgoogleMaps: Overlays on Static Maps

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, 


    ...)

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

Value

list with tiles

Author(s)

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)


  


}

RgoogleMaps documentation built on Nov. 6, 2023, 5:08 p.m.