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XYZ marine bathymetric grids of survey GA-2476 WA Margins onboard the RV Sonne

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: ANZCW0703015125

Title: XYZ marine bathymetric grids of survey GA-2476 WA Margins onboard the RV Sonne


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

The WA Margins Reconnaissance survey, GA-2476 was acquired during October 2008 to January 2009 onboard the RV Sonne as part of the Energy Security Program. Almost 230,000 square kilometres of multibeam bathymetry was acquired over the duration of the survey including all transits. Seafloor features revealed by the backscatter and swath bathymetry have shown that geomorphology of the study areas is diverse. The continental slope of the west Australian margin study areas is characterised by large areas with numerous deeply incised canyons and areas with low-angle slumps and scarps mostly on the upper part of the slope. Other geomorphic features on the continental slope include short escarpments of local extent and small volcanic peaks over the Houtman Sub-basin part of the Perth margin. New bathymetry from the Cuvier Plateau has mapped large volcanic domes, some of them with terraces, ridges, a large previously unmapped valley and two large seamounts (newly named the Cuvier Seamount and the Wallaby seamount). The dataset contains eight XYZ grids of 100m resolution; colour tiff images shaded with sun azimuth 45 degrees and a geotiff of the entire survey with a depth legend to go with the images

ANZLIC search words:

  • GEOSCIENCES Mapping
  • GEOSCIENCES Geomorphology Mapping
  • MARINE Biodiversity
  • MARINE Geology and Geophysics Surveys
  • OCEANOGRAPHY Exploration

Spatial domain:

locality map

Geographic extent name: AUSTRALIA INCLUDING EXTERNAL TERRITORIES - AUSAAT - Australia - Australia

Geographic extent polygon: 104.52 -8.45, 118.33 -8.45, 118.33 -32.03, 104.52 -32.03, 104.52 -8.45,

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

Geographic bounding box:
North bounding latitude: -8.45 °
South bounding latitude: -32.03 °
East bounding longitude: 118.33 °
West bounding longitude: 104.52 °

Data currency

Beginning date: 2008-10-25

Ending date: 2009-01-19


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - comma_delimited Ascii file Universal Transverse Mercator (UTM) WGS84
DIGITAL - ArcGIS-grid ArcInfo grid WGS84
DIGITAL - tif Tagged Image File Format (TIFF) - including GeoTIFF WGS84
Available format type:
DIGITAL - comma_delimited Ascii file Universal Transverse Mercator (UTM) WGS84
DIGITAL - ArcGIS-grid ArcInfo grid WGS84
DIGITAL - tif Tagged Image File Format (TIFF) - including GeoTIFF WGS84

Access constraints:

This material is released under the Creative Common Attribution 3.0 Australia Licence.

The bathymetry grids are not to be used for any navigational puprposes.

Free Data Download

Data quality

Lineage:

The data was acquired onboard the RV. Sonne during the period of the 25th of October 2008 to 19th of January 2009 using the Kongsberg multibeam bathymetric system EM120 (12 kHz) that emits 191 beams per ping and 2 degrees width along track and 2 degrees width across track and an angular coverage of 150 degrees (75 degrees port/7 degrees starboard).

The data was converted into the bathymetry processing software, CARIS HIPS & SIPS using the following procedures:

1- A vessel configuration file was created for RV Sonne, where the co-ordinates of the motion sensor and DGPS antenna and patch test offsets were recorded.

2- The raw swath sonar data, in raw.all format, for each line was then imported into the project and the vessel information assigned to the data.

3- The motion sensor, DGPS and heading data were then cleaned using a filter that averaged adjacent data to remove artifacts.

4- Different sound velocity profiles data for each block were attached to the corresponding raw swath sonar data files to correct the depths for changes in the speed of sound through the water column.

5- Then a new blank field area was defined that specified the geographic area of study and the co-ordinate system used. The co-ordinates for all the study areas were WGS84 UTM-49S for Zeewyck, Houtman, Exmouth sub basins, Wallaby Plateau and Trans2 areas.

6- The data was cleaned by applying several filters that removed any remaining spikes in the bathymetry data using user defined threshold values. A visual inspection of the data for each line was then undertaken where artefacts and noisy data not removed by the filtering process were removed manually using Swath and subset editors modules of the Caris HIPS/SIPS software.

7- All the data for each bathymetric, motion sensor, DGPS, heading, tide and sound velocity profile data were merged to produce the final processed data file. A weighted grid of the processed data was then created for each Block.

8- The processed data was finally exported as final processed data in ASCII XYZ file format with header information, exported as Easting, Northing and negative depth, projected in UTM and WGS84 as datum.

9 to 16- 8 ESRI Arc Info grids were created from those bathymetric ASCII XYZ grids.

17 to 24- 8 Georeferenced colour tif images of the above mentioned sub-basin and transits were created, shaded with sun azimuth 45 degrees and 100m resolution for presentation.

Positional accuracy:

Visual assessment of the grids indicates that its logical consistency is good.

The RV Sonne used a DGPS and several GPS receivers with an accuracy of 10m.

Attribute accuracy:

High quality swath bathymetric data that form an aereal coverage exists, overlapping swaths and speed of sound corrections show that the data are quite accurate. Some transit swath data also have speed of sound corrections applied and are assumed to be highly accurate. Other transit swath surveys have utilized a nominal speed of sound of 1500 m/s and are not as accurate.

Logical Consistency:

Visual assessment of the grids indicates that its logical consistency is good.

Each of the survey input dataset was examined in detail and edited where necessary. GA-2476, WA Margin intersected several generic surveys in the area and those overlapping generic surveys were corrected s well as GA's bathy database.

Completeness:

All of the data acquired during this survey was used to produce the grids.


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: sales@ga.gov.au

Metadata information

Metadata date: 2013-03-08


Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703015125.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703015125.xml

Survey Name: GA-2476, WA Margins Marine Reconnaissance survey (Leg 1-3)

Vessel: RV Sonne

Country: Germany

Operator: BMFT

Bathymetric system used: EM120

Year of installation: 2001

Nominal sonar frequency: 12 kHz

Number of beams: 191 beams

Beamwidth across track:2 degrees

Beamwidth along track : 2 degrees

Pulse length: Variable, operator selectable

Depth range: 15m - 6260m

Vessel speed: 10 - 12 knots depending on sea state.

Start date of survey: 25 October 2008

End date of survey: 19 January 2009

Institution: Geoscience Australia

Start port: Singapore

End port: Cigading, Indonesia

Survey leaders: Dr Kriton Glenn, Dr. Michael Hughes, Dr. Andrew Heap

Data acquired and processed by: Michele Spinoccia, Cameron Buchanan

Grids resolution: 100m

Number of grids: 8

This dataset consist of the following ASCII files including a header:

1- XYZ grid for the Exmouth Sub-basin 100m resolution, projected in Eastings and Northing UTM 49S, WGS84.

2- XYZ grid for the Houtman Sub-basin 100m resolution, projected in Eastings and Northing UTM 49S, WGS84.

3- XYZ grid for the Perth_Zeewyck Sub-basin 100m resolution, projected in Eastings and Northing UTM 49S, WGS84.

4- XYZ grid for the Wallaby Plateau Sub-basin 100m resolution, projected in Eastings and Northing UTM 49S, WGS84.

5- XYZ grid for the Transit1 100m resolution, projected in Eastings and Northing UTM 50S, WGS84.

6- XYZ grid for the Transit2 100m resolution, projected in Eastings and Northing UTM 49S, WGS84.

7- XYZ grid for the Transit2Freo 100m resolution, projected in Eastings and Northing UTM 50S, WGS84.

8- XYZ grid for the Transit3 100m resolution, projected in Eastings and Northing UTM 48S, WGS84.

9 to 16- 8 ESRI Arc info grids were created for the above mentioned areas.

17 to24- 8 Georeferenced colour tif images of the previous Sub-Basin and transits were created ay 100m resolution, shaded with sun azimuth 45 degrees.

- Georeferenced colour tif image of the entire survey that show the location of the different grids and including a depth legend.

- PDF image of the survey.

- Swath acquisition and processing report.

Authors:Spinoccia, M. Buchanan, C.
SPATIAL INFORMATION FOR THE NATION