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This dataset contains the Level 1 Marine Bioregionalisation as defined by the National Bioregionalisation Working Group. Province boundaries have been defined from the Australian Exclusive Economic Zone to the edge of the shelf as defined in the Geomorphic Units dataset. The boundaries in this dataset define areas of core province and transitional areas of the benthic bioregions of Australia.

The Geophysical Processing and Data Access (GPDA) project at Geoscience Australia has undertaken a programme of collating, editing and cataloguing all bathymetry data in the Australian Region. For convenience this region has been loosely defined as extending from 5°S to 80°S and 45°E to 180°E. The contents of the Bathymetric Database consists of four datatypes: - Multibeam Echosounder Data (including LADS) - Singlebeam Echosounder Data - Depths from the digitisation of pre-existing maps - "Depths" derived from remote sensing techniques (and produced grids) The dataset described by this metadata record is the Multibeam Echosounder Dataset. It consists of the soundings of a number of multibeam surveys (170 by April 2007), that vary in size from a few km2 to about 250,000 km2 in size. Data coverage of the defined region is not complete. The datasets were collected by a variety of vessels (Australian and foreign) using a range of sensor systems. As a result the original data exist in a variety of raw data formats on a variety of media. These raw data have been archived in a secure repository at GA. For more details, one should access the metadata records for the individual surveys or the report given in the "Additional Metadata" section of this metadata record. All of the raw data have been imported into the CARIS HIPS application and processed using a common workflow. The processed data have then been exported as GSF "day" files (MBSystem format 121) and stored on Unix directories. These files are easily manipulated using most multibeam data applications

These colour and greyscale images are a digital pictorial representation of the 250 decimal degree bathymetric grid of the Australian region. This image is a dirivitive of the origional 30 arc second grid of Australia. There have been recent swath mapping additions to the origional in bathymetric data that have vastly improve the quality of the data and these images contain that information, they are however a work in progress and official higher resolotion datasets are expected in the near future. The original gridded bathymetry model for the Australian continental margin was generated from 14,000,000 data points gathered from numerous data sources and compiled by Cameron Buchanan at the Australian Geological Survey Organisation, as part of the Continental Margins Program. The database is a 30-arc-second model that can display undersea features as small as 900 metres (as seen in the images). The model has been compiled over several years from hundreds of marine surveys. It includes data acquired by industry and foreign agencies, and from over 200 days of modern deep-water seafloor swath-mapping surveys. In some areas not covered by marine surveys, it incorporates bathymetry data derived from satellite measurements.

The bathymetry contours are an interpretation of the the sea floor in the region of the Bremer sub-basin.

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