NumTiles: computes the necessary number of tiles from a bounding box...

In RgoogleMaps: Overlays on Static Maps

computes the necessary number of tiles from a bounding box and a zoom level

Description

computes the necessary number of tiles from a bounding box and a zoom level

Usage

NumTiles(lonR, latR, zoom = 13, CheckExistingFiles = TRUE, 


    tileExt = ".png", tileDir = "~/mapTiles/OSM/", 


    verbose = 0)

Arguments

lonR	longitude range
latR	latitude range,
zoom	zoom level
CheckExistingFiles	logical, if TRUE check if files already exist and only download if not!
tileExt	image type of tile
tileDir	map tiles are stored in a local directory, e.g. "~/mapTiles/Google/"
verbose	level of verbosity

Value

tuple with number of tiles for lon and lat extent

Author(s)

Markus Loecher

Examples

if (0){


  #US bounding box:


  for (zoom in 4:15) {


    cat("OSM, zoom =", zoom, "\n")


    NumTiles(lonR=c(-135,-66), latR=c(25,54) , zoom=zoom)


  }


  for (zoom in 4:15) {


    cat("Google, zoom =", zoom, "\n")


    NumTiles(lonR=c(-135,-66), latR=c(25,54) , zoom=zoom, tileDir= "~/mapTiles/Google/")


  }


}

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