Western Australia, South Australia, Queensland,
New South Wales, Victoria and Tasmania (which are states of Australia)
and the Northern Territory (which is a `territory' of Australia)
are represented as polygonal regions.
Offshore territories, and smaller mainland territories, are not shown.
The dataset austates
is a tessellation object (class "tess"
)
whose tiles are the states and territories.
The coordinates are latitude and
longitude in degrees, so the space is effectively a Mercator
projection of the earth.