staticmap_getRasterBrick: Create a rasterBrick from a tiled image server

In PWFSLSmoke: Utilities for Working with Air Quality Monitoring Data

Description

Uses the input coordinates to select an appropriate method to build a raster::rasterBrick object. It will either use the staticmap_getStamenmapBrick() function or the staticmap_getEsrimapBrick() function This can then passed as the rasterBrick object to the staticmap_plotRasterBrick() function for plotting.

Usage

staticmap_getRasterBrick(
  centerLon = NULL,
  centerLat = NULL,
  maptype = "world_topo",
  zoom = 12,
  width = 640,
  height = 640,
  bbox = NULL,
  maxTiles = 40,
  crs = sp::CRS("+init=epsg:4326"),
  tileCacheDir = tempdir()
)

Arguments

centerLon	Map center longitude.
centerLat	Map center latitude.
maptype	Defaults to Esri Topographic Available to select between Stamen basemaps or Esri basemaps. Stamen terrain terrain-background terrain-labels terrain-lines toner toner-background toner-hybrid toner-labels toner-labels toner-lines toner-lite watercolor Esri "world_topo" "world_imagery" "world_terrain" "de_Lorme" "world_grey" "world_streets"
zoom	Map zoom level.
width	Width of image, in pixels.
height	Height of image, in pixels.
bbox	If you are using the Esri maps, then the bbox parameter must be an st_bbox object as specificed in the sf package documentation https://www.rdocumentation.org/packages/sf/versions/0.7-4/topics/st_bbox. If using Stamen Maps, use a vector organized as (lonLo, latLo, lonHi, latHi) If not null, centerLon, centerLat, and zoom are ignored.
maxTiles	Only utilized if selecting an esri basemap, specifies the maximum number of tiles to be returned. The greater the number, the slower the performance – arbitrarily set to 20 by default.
crs	Object of class CRS. The Coordinate Reference System (CRS) for the returned map. If the CRS of the downloaded map does not match, it will be projected to the specified CRS using raster::projectRaster.
tileCacheDir	Optional location for cached tiles.

Value

A rasterBrick object which can be plotted with staticmap_plotRasterBrick() or raster::plotRGB() and serve as a base plot.

Note

The spatial reference of the image when it is downloaded is 3857. If the crs argument is different, projecting may cause the size and extent of the image to differ very slightly from the input, on a scale of 1-2 pixels or 10^-3 degrees.

If bbox is specified and the bbox aspect ratio does not match the width/height aspect ratio the extent is resized to prevent the map image from appearing stretched, so the map extent may not match the bbox argument exactly.

See Also

staticmap_getStamenmapBrick

staticmap_getEsrimapBrick

staticmap_plotRasterBrick

Examples

## Not run: 
# Fail gracefully if any resources are not available
try({

rasterBrick <- staticmap_getRasterBrick(-122.3318, 47.668)
staticmap_plotRasterBrick(rasterBrick)


rasterBrick <- staticmap_getRasterBrick(-122.3318, 47.668, "world_streets", 12)
staticmap_plotRasterBrick(rasterBrick)


rasterBrick <- staticmap_getRasterBrick(-122.3318, 47.668, "watercolor", 12)
staticmap_plotRasterBrick(rasterBrick)

}, silent = FALSE)

## End(Not run)

PWFSLSmoke documentation built on Nov. 23, 2021, 5:06 p.m.