The National Catchment Database is a linked set of spatial layers and associated attribute tables describing key elements of the surface water hydrology of the Australian continent at a map scale of about 1:250,000. It is built upon the representation of surface drainage patterns provided by the GEODATA national 9 second Digital Elevation Model (DEM) Version 3 (ANU Fenner School of Environment and Society and Geoscience Australia, 2008).

The Australian Hydrological Geospatial Fabric (Geofabric) is a specialised Geographic Information System (GIS). It registers the spatial relationships between important hydrological features such as rivers, water bodies, aquifers and monitoring points.

The surface hydrology dataset provides a seamless surface layer for Australia at a nominal scale of 1:250,000. It consists of lines, points and polygons representing natural and man-made features such as water courses, lakes, dams and other water bodies. The natural water course layer consists of a linear network with a consistent topology that provide directional flow paths through the network for hydrological analysis. This network was used to produce the National 9 second Digital Elevation Model (DEM) of Australia. It also provides information on naming, hierarchy and perennially.

The Transport and Topography dataset is underpinned by a road centreline layer of over 2.7 million kilometres of roads, together with more than 30 feature types within transport, hydrology and green space themes. Roads - a national coverage of network roads at all levels within Australia. Everything from major highways to outback tracks, new roads and changes to current roads. Airports - all aspects of airport infrastructure within Australia, including all airports from international to local landing strips.