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Petrel Sub-basin Marine Survey (GA-0335 / SOL5463) (NLECI Program) - High Resolution Backscatter Grids

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: ANZCW0703016662

Title: Petrel Sub-basin Marine Survey (GA-0335 / SOL5463) (NLECI Program) - High Resolution Backscatter Grids


Custodian: Geoscience Australia

Jurisdiction: Australia



The Petrel Sub-basin Marine Environmental Survey GA-0335, (SOL5463) was acquired by the RV Solander during May 2012 as part of the Commonwealth Government's National Low Emission Coal Initiative (NLECI). The survey was undertaken as a collaboration between the Australian Institute of Marine Science (AIMS) and GA. The purpose was to acquire geophysical and biophysical data on shallow (less then 100m water depth) seabed environments within two targeted areas in the Petrel Sub-basin to support investigation for CO2 storage potential in these areas.

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: 128.75 -12.25, 130.833 -12.25, 130.833 -13, 128.75 -13, 128.75 -12.25,

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

Geographic bounding box:
North bounding latitude: -12.25 °
South bounding latitude: -13 °
East bounding longitude: 130.833 °
West bounding longitude: 128.75 °

Data currency

Beginning date: 2012-05-04

Ending date: 2012-05-30

Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Stored data format:
DIGITAL - xls Microsoft Excel spreadsheet Excel WGS84
Available format type:
DIGITAL - xls Microsoft Excel spreadsheet Excel 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 25 degrees. The following commands were used to process and generate the grids in *.bat mode:

cd e:\working_data\solander\sol5463_bonaparte_gulf_2012_reproc\proc

reprocess -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_sol5463_leg1_sh547.txt -fe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1 -A25 -L100 -M2 -dwgs84 -z52 -K1 -V4 -S1 -Be:/working_data/calib/SingleHead547o_new.bpt

reprocess -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_sol5463_leg1_sh548a.txt -fe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1 -A25 -L100 -M2 -dwgs84 -z52 -K1 -V4 -S1 -Be:/working_data/calib/SingleHead548n_new.bpt -b-0.55

reprocess -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_sol5463_leg1_sh548b.txt -fe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1 -A25 -L100 -M2 -dwgs84 -z52 -K1 -V4 -S1 -Be:/working_data/calib/SingleHead548n_new.bpt -b4.42

reprocess -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_sol5463_leg1_sh548c.txt -fe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1 -A25 -L100 -M2 -dwgs84 -z52 -K1 -V4 -S1 -Be:/working_data/calib/SingleHead548n_new.bpt -b-0.55

reprocess -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_sol5463_leg2_sh548_rentPU.txt -fe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1 -A25 -L100 -M2 -dwgs84 -z52 -K1 -V4 -S1 -Be:/working_data/calib/SingleHead548n_new.bpt -b0.87

cd e:\working_data\solander\sol5463_bonaparte_gulf_2012_grid1\proc

LargeGrid -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_grid1.txt sscecomp 2 boundary atile -R474710/507490/8571470/8607670 -Oe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1/grd/bksct_grid1_reprocA25_final_2m.asc

LargeGrid -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_grid1.txt sscecomp 5 boundary atile -R474710/507490/8571470/8607670 -Oe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1/grd/bksct_grid1_reprocA25_final_5m.asc

LargeGrid -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_grid2.txt sscecomp 2 boundary atile -R518400/536050/8619200/8640200 -Oe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1/grd/bksct_grid2_reprocA25_final_2m.asc

LargeGrid -Ie:/working_data/solander/sol5463_bonaparte_gulf_2012/filelist_grid2.txt sscecomp 5 boundary atile -R518400/536050/8619200/8640200 -Oe:/working_data/solander/sol5463_bonaparte_gulf_2012_grid1/grd/bksct_grid2_reprocA25_final_5m.asc

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: Petrel Sub-basin Marine Survey (GA-0335 / SOL5463) (NLECI Program)

Vessel: RV Solander

Country: Australia

Operator: AIMS

Bathymetric system used: Kongsberg EM3002

Year of installation: 2012

Nominal sonar frequency: 300 kHz

Number of beams: 160 beams

Beamwidth across track: 1.5 degrees

Beamwidth along track : 1.5 degrees

Pulse length: Variable, operator selectable

Depth range: 20 - 180 m

Vessel speed: 8 - 10 knots

Start date of survey: 04 May 2012

End date of survey: 30 May 2012

Institution: Geoscience Australia

Start port: Darwin

End port: Darwin

Survey leaders: Andrew Carroll & Diane Jorgensen

Data acquired and processed by: IXSurvey, Justy Siwabessy

Grids resolution: 2m

Number of grids: 2

This dataset consist of the following files:

- Georeferenced colour tif images in 2m resolution, shaded with sun azimuth 45 degrees

- ESRI ascii (*.asc) grids in 2 m resolution in UTM52S WGS84

- ESRI Rasters in 2m resolution

- KMZ files

Authors:Siwabessy, J.