arcgislayers (version 0.4.0)

clear_query: Utility functions

Description

Utility functions

Usage

clear_query(x)
list_fields(x)
pull_field_aliases(x)
list_items(x)
refresh_layer(x)

Value

See Details.

Arguments

x

an object of class FeatureLayer, Table, or ImageServer.

Details

• list_fields() returns a data.frame of the fields in a FeatureLayer or Table

• list_items() returns a data.frame containing the layers or tables in a FeatureServer or MapServer

• clear_query() removes any saved query in a FeatureLayer or Table object

• refresh_layer() syncs a FeatureLayer or Table with the remote resource picking up any changes that may have been made upstream. Returns an object of class x.

• pull_field_aliases() returns a named list of the field aliases from a FeatureLayer or Table

Examples

if (FALSE) {
furl <- paste0(
  "https://services3.arcgis.com/ZvidGQkLaDJxRSJ2/arcgis/rest/services/",
  "PLACES_LocalData_for_BetterHealth/FeatureServer/0"
)

flayer <- arc_open(furl)

# list fields available in a layer
list_fields(flayer)

# remove any queries stored in the query attribute
clear_query(update_params(flayer, outFields = "*"))

# refresh metadata of an object
refresh_layer(flayer)

map_url <- paste0(
  "https://services.arcgisonline.com/ArcGIS/rest/services/",
  "World_Imagery/MapServer"
)

# list all items in a server object
list_items(arc_open(map_url))
}