The principal aquifers of Australia (National Geoscience Dataset) has been used to produce the hydrogeology map of the Australian continent. It is described in terms of principal aquifers, defined as those producing the best quality water at highest yield from shallowest depth. Aquifers are defined as porous or fissured, and subdivided in terms of their extent and productivity; these aspects are shown in solid colour on the map.
Produced from the 1:5 000 000 scale Hydrogeology of Australia map (Jacobsen and Lau, 1987), involving conversion of IGDS files into Arcinfo and creating topology and attributing polygons. Later inclusion of AGSO standard attributes feature and UFI in 1998.