slippy_raster: Creates a square raster centred on any lat long point, or a...
In neilcharles/geoviz: Elevation and GPS Data Visualisation

Description Usage Arguments Value Examples

Creates a square raster centred on any lat long point, or a rectangular raster surrounding a set of lat long points from 'Mapbox', 'Mapzen' or 'Stamen' Maps using the 'slippymath' package

slippy_raster(
  lat,
  long,
  square_km,
  width_buffer = 1,
  image_source = "stamen",
  image_type = "watercolor",
  max_tiles = 10,
  api_key
)

`lat`	WGS84 latitude. Either a single point to use as the centre for a `square_km` sized raster, or a vector of track points
`long`	WGS84 longitude. Either a single point to use as the centre for a `square_km` sized raster, or a vector of track points
`square_km`	length of one edge the required square area, in km. Ignored if lat and long have length > 1
`width_buffer`	If lat and long have length > 1, used as buffer distance around the provided points in km
`image_source`	Source for the overlay image. Valid entries are "mapbox", "mapzen", "stamen".
`image_type`	The type of overlay to request. "satellite", "mapbox-streets-v8", "mapbox-terrain-v2", "mapbox-traffic-v1", "terrain-rgb", "mapbox-incidents-v1" (mapbox), "dem" (mapzen) or "watercolor", "toner", "terrain" (stamen)
`max_tiles`	Maximum number of tiles to be requested by 'slippymath'
`api_key`	API key (required for 'mapbox')

a rasterBrick image

lat <- 54.4502651
long <- -3.1767946
square_km <- 1

overlay_image <- slippy_raster(lat = lat,
  long = long,
  square_km = square_km,
  image_source = "stamen",
  image_type = "watercolor",
  max_tiles = 5)