The basemap contains layers which are base or reference layers. Typically, you will use one basemap layer that is drawn beneath all other layers, but you can also add a basemap layer on top of all other layers to depict boundaries, labels, or a road network. In order to take advantage of geographically load balanced services and monitor usage with API keys or named users, use Basemap.Basemap(BasemapStyle).
Creates basemap with an URI. If the specified URI is a portal item URL (see PortalItem.PortalItem(String) for the supported URL formats), the underlying PortalItem will be created and accessible through Basemap.getItem().
Cancels loading metadata for the Loadable object.
An API key is a unique key used to authorize access to specific services and resources in ArcGIS Online. It is also used to monitor access to those services.