The RS9401 bathymetry survey, GA0124 was acquired by Geoscience Australia onboard the Australian vessel Rig Seismic from the 12th of January to the 16th of February 1994 using an MR1 (12 kHz) towed sidescan sonar system.
The objectives of the RS9401 bathymetry survey was to collect new data in order to update our understanding of the Macquarie Ridge Complex (MRC), located at the boundary between the Pacific and Australian plates.
The survey acquired Sidescan/ bathymetry, gravity and 96- channel seismic reflection imaging across the morphologic ridge and trench system. Gravity and magnetic data were collected during the entire survey.
This V0 dataset contains three, 128 m resolution 32-bit geotiff of the Macquarie Ridge survey area produced from the processed MR1 bathymetry data.
This dataset is not to be used for navigational purposes.
This dataset is published with the permission of the CEO, Geoscience Australia.
Australian Government Security ClassificationSystem
Classification - unclassified
Creative Commons Attribution 4.0 International Licence
Access - license
Use - license
While AusSeabed aims to publish data to the level of adherence based on the requirements stated in the AusSeabed multibeam guidelines (version 1), we will also publish interim products (version 0) that are currently available, but have not yet been standardised (version 1).
Users should be aware that V1 products will always supersede V0 products.
This is a V0 product for GA-0124.
The Chief scientist onboard was Dr. Mike Coffin and Dr. Doug Ramsay.
This dataset was produced using CARIS HIPS/SIPS v.7.1.2
The vertical datum is MSL while the horizontal datum is WGS84 UTM-57 and 58S.
For any metadata questions, please download the Metadata.txt file with the dataset.
1. A vessel configuration file was created where the co-ordinates of the motion sensor, DGPS antenna and patch test offsets were recorded.
2. A new project was created and the vessel configuration file attached to the project file.
3. The raw swath sonar data files, in raw.all format, for each line was imported into the project and the vessel information assigned to the data.
Ellipsoid vertical reference system is our first preference and when not available or possible to do so, a tidal zone data is the next preference to be applied to the data
4. The motion sensor, DGPS and heading data were cleaned using a filter that averaged adjacent data to remove artefacts.
5. Sound velocity profiles data for each block of the data were attached to the corresponding raw swath sonar data files.
6. A new blank fieldsheet area was defined that specified the geographic area of study and the co-ordinate system used.
7. The data was cleaned by applying several filters that removed any spikes in the data using user defined threshold values.
8. Data were inspected visually for each line where artifacts and noisy data had not removed by the filtering process.
9. Remaining spikes were removed manually using the swath and subset editor modules.
10. All the data, i.e. bathymetric sounding and ancillary data, were merged to produce the final processed data file
11. A weighted grid of the processed data was then created.
12. Independent velocity corrections were performed where velocity artefacts were observed.
13. The final processed grid was exported as a 32 bit Geotif format at 128 m resolution.
WGS 84 / UTM zone 57S (EPSG:32757) WGS 84 / UTM zone 58S (EPSG:32758)