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Backscatter grid of Darwin Harbour from Survey onboard the Matthew Flinders - 2011

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: ANZCW0703016636

Title: Backscatter grid of Darwin Harbour from Survey onboard the Matthew Flinders - 2011


Custodian: Geoscience Australia

Jurisdiction: Australia



A bathymetric survey of Darwin Harbour was undertaken during the period 24 June to 20 August 2011 by iXSurvey Australia Pty Ltd for the Department of Natural Resources, Environment, The Arts and Sport (NRETAS) in collaboration with Geoscience Australia (GA), the Darwin Port Corporation (DPC) and the Australian Institute of Marine Science (AIMS) using GA's Kongsberg EM3002D multibeam sonar system and DPC's vessel Matthew Flinders.

ANZLIC search words:

  • MARINE Geology and Geophysics Mapping

Spatial domain:

locality map

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

Geographic extent polygon: 130.69 -12.32, 130.94 -12.32, 130.94 -12.59, 130.69 -12.59, 130.69 -12.32,

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

Geographic bounding box:
North bounding latitude: -12.32 °
South bounding latitude: -12.59 °
East bounding longitude: 130.94 °
West bounding longitude: 130.69 °

Data currency

Beginning date: Not Known

Ending date: Not Known

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - seg y Seismic digital data - SEG Y format Universal Transverse Mercator (UTM) WGS84
Available format type:
DIGITAL - seg y Seismic digital data - SEG Y format Universal Transverse Mercator (UTM) WGS84

Access constraints:

This material is released under the Creative Commons Attribution 3.0

Free Data Download

Data quality


The backscatter data were processed using CMST-GA MB Process v12.05.07 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 grid values are basically the average values of the processed backscatter point data within each grid cell of predefined size, normalised to the backscatter strength at an angle of 40 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 but it is cell size dependent. Note that the water depth dictates the cell size

Logical Consistency:

All procedures, steps and software involved in producing a backscatter grid are 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:

Processing software: CMST-GA MB Process v12.05.07

Survey Name: Bathymetric Survey of Darwin Harbour

Vessel: Matthew Flinders

Country: Australia

Operator: Darwin Port Corporation

Bathymetric system used: Kongsberg EM3002D

Year of installation: 2011

Nominal sonar frequency: 300 kHz

Number of beams: 320 beams

Beamwidth across track: 1.5 degrees

Beamwidth along track : 1.5 degrees

Pulse length: Variable, operator selectable

Depth range: 0m - 44m

Vessel speed: 6 - 7 knots

Start date of survey: 24 June 2011

End date of survey: 20 August 2011

Institution: Geoscience Australia

Start port: Darwin

End port: Darwin

Survey leaders: Ian Atkinson

Data acquired and processed by: IXSurvey, Ian Atkinson, Justy Siwabessy

Grids resolution: 1m

Number of grids: 1

This dataset consist of the following files:

- Georeferenced colour tif image in 1m resolution, shaded with sun azimuth 45 degrees

- ESRI ascii (*.asc) in 1 m resolution in UTM52S WGS84

- ESRI Raster in 1m resolution

- KMZ file

Authors:Siwabessy, J.