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Processed multibeam backscatter data of the South East Tasmania Shelf

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.

Dataset citation

ANZLIC unique identifier: ANZCW0703016230

Title: Processed multibeam backscatter data of the South East Tasmania Shelf


Custodian: Geoscience Australia

Jurisdiction: Australia



Geoscience Australia carried out marine surveys in southeast Tasmania in 2008 and 2009 (GA0315) to map seabed bathymetry and characterise benthic environments through observation of habitats using underwater towed video. Data was acquired using the Tasmania Aquaculture and Fisheries Institute (TAFI) Research Vessel Challenger. Bathymetric mapping was undertaken in seven survey areas, including: Freycinet Pensinula (83 sq km, east coast and shelf); Tasman Peninsula (117 sq km, east coast and shelf); Port Arthur and adjacent open coast (17 sq km); The Friars (41 sq km, south of Bruny Island); lower Huon River estuary (39 sq km); D Entrecastreaux Channel (7 sq km, at Tinderbox north of Bruny Island), and; Maria Island (3 sq km, western side). Video characterisations of the seabed concentrated on areas of bedrock reef and adjacent seabed in all mapped areas, except for D Entrecastreaux Channel and Maria Island. The "challenger" folder contains processed multibeam backscatter data of the South East Tasmania Shelf. The SIMRAD EM3002 multibeam backscatter data were processed using the CMST_GA MB Process, a multibeam processing toolbox codeveloped by Geoscience Australia and Curtin University of Technology

ANZLIC search words:

  • MARINE Mapping
  • MARINE Geology and Geophysics

Spatial domain:

locality map

Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia

Geographic extent polygon: 147.05 -42, 148.55 -42, 148.55 -43.62, 147.05 -43.62, 147.05 -42,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:
North bounding latitude: -42 °
South bounding latitude: -43.62 °
East bounding longitude: 148.55 °
West bounding longitude: 147.05 °

Data currency

Beginning date: 2008-06-15

Ending date: 2009-03-12

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - xls Microsoft Excel spreadsheet Excel GDA94
Available format type:
DIGITAL - xls Microsoft Excel spreadsheet Excel GDA94

Access constraints:

The processed data is not to be released. Contact custodian for more information.

Order Product

Data quality


The backscatter data were processed using CMST_GA MB Process v8.11.02.1 software. The fully processed backscatter strengths were corrected for transmission loss and insonification area. The process within the toolbox also involved removal of the system transmission loss, removal of the system model, calculation of the incidence angle and removal of the angular dependence. The angularly equalised backscatter strengths were normalised to the backscatter strength at an angle of 25 degrees

Positional accuracy:

Inherited from raw data in which C_NAV system was used to provide geographical postion with a manufacturer accuracy of 10 cm RMS. Inherited from raw data in which Applanix system was used to provide roll and pitch, and heave with manufacturer accuracies for roll and pitch are 0.05 deg. RMS, and manufacturer accuracy for heave is 5 cm.

Attribute accuracy:

The accuracy is high since all the computaion has been conducted in double precision

Logical Consistency:

All procedures and steps involved in backscatter processing within the software used were kept similar



Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address:

Metadata information

Metadata date: 2013-03-08

Additional metadata

Metadata reference XHTML:

Metadata reference XML:


Authors:Siwabessy, J.