A selectable base map for the layer switcher (StorymapOptions.basemaps).
StorymapOptions.basemaps
Optional
Control row label. Defaults to map_type. A function is re-invoked on every refreshLabels() for host i18n (constructor options only — see StorymapOverlayLayer.label).
map_type
refreshLabels()
StorymapOverlayLayer.label
Any map_type value.
A selectable base map for the layer switcher (
StorymapOptions.basemaps).