Pull a raster layer from a map service or image service layer of an ArcGIS REST API

This is an internal function to pull raster layers from either a map service or an image service of an ArcGIS REST API. This function is the engine that drives get_map_layer and get_image_layer

Usage

get_raster_layer(
  url,
  sf_object = NULL,
  bbox = NULL,
  token = "",
  clip_raster = TRUE,
  format = "png",
  transparent = TRUE,
  export_type = "map",
  add_legend = FALSE,
  ...
)

Arguments

url: A character string of the url for the layer to pull
sf_object: An sf object used for the bounding box
bbox: Character string of the bounding box
token: A character string of the token (if needed)
clip_raster: Logical. Should the raster be clipped to contain only the pixels that reside in the sf_object? By default, ArcGIS returns some overlapping edge pixels. Setting clip_raster to TRUE (default) will remove these using mask from the raster package
format: The raster format desired. Default is "png"
transparent: Logical. Retrieve a raster with a transparent background (TRUE, default) or not (FALSE)
export_type: Character. Either "map" or "image" for the respective service layer desired
add_legend: Logical. Pull legend and match to color values (TRUE, default) or not (FALSE)
...: Additional arguments to pass to the ArcGIS REST API

Value

An object of type RasterLayer if export_type = "map" or an object of type RasterStack if export_type = "image"