Every landmarks knob with its kind, description and, for visible, its default. It's static data,
readable without a map.
Remarks
A knob is a plain value in Landmarks3DConfig, under its id. Every knob but visible
follows the base map's 3D buildings while unset, which the SDK's getKnob reports.
Every landmarks knob with its kind, description and, for
visible, its default. It's static data, readable without a map.