Extract a layer from a Feature or Map Server

These helpers provide easy access to the layers contained in a FeatureServer or MapServer.

Usage

get_layer(x, id = NULL, name = NULL, token = arc_token())

get_all_layers(x, token = arc_token())

get_layers(x, id = NULL, name = NULL, token = arc_token())

Arguments

x

an object of class FeatureServer or MapServer

id

default NULL. A numeric vector of unique ID of the layer you want to retrieve. This is a scalar in get_layer().

name

default NULL. The name associated with the layer you want to retrieve. name is mutually exclusive with id. This is a scalar in get_layer().

token

your authorization token.

Value

• get_layer() returns a single FeatureLayer or Table based on its ID

• get_layers() returns a list of the items specified by the id or name argument

• get_all_layers() returns a named list with an element layers and tables. Each a list containing FeatureLayer and Tables respectively.

Details

The id and name arguments must match the field values of the respective names as seen in the output of list_items()

Examples

if (FALSE) {
  # FeatureServer
  furl <- paste0(
    "https://services3.arcgis.com/ZvidGQkLaDJxRSJ2/arcgis/rest/services/",
    "PLACES_LocalData_for_BetterHealth/FeatureServer"
  )

  fserv <- arc_open(furl)

  fserv
  get_layer(fserv, 0)
  get_layers(fserv, name = c("Tracts", "ZCTAs"))
  get_all_layers(fserv)
}