Bonaparte and Browse basins 3D seismic derived bathymetry compilation (20220002C)
The Bonaparte and Browse Basins 3D seismic derived bathymetry compilation (20220002C) was produced by the University of Western Australia, Norwegian Geotechnical Institute and UniLasalle in collaboration with Geoscience Australia through the AusSeabed initiative. The compilation integrates 127 bathymetry grids derived from available and workable 3D seismic datasets into a 30 m resolution 32-bit geotiff. A detailed workflow is described in: Lebrec, U., Paumard, V., O'Leary, M. J., and Lang, S. C., 2021, Towards a regional high-resolution bathymetry of the North West Shelf of Australia based on Sentinel-2 satellite images, 3D seismic surveys, and historical datasets: Earth System Science Data, v. 13, no. 11, p. 5191-5212 https://doi.org/10.5194/essd-13-5191-2021, 2021.
This dataset is not to be used for navigational purposes.
Simple
Identification info
- Date (Creation)
- 2022-11-03
- Date (Publication)
- 2022-11-11T22:44:49
- Date (Revision)
- 2022-12-15T06:10:48
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/147396
- Citation identifier
- Digital Object Identifier/https://dx.doi.org/10.26186/147396
- Cited responsible party
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Role Organisation / Individual Name Details Author Lebrec, U.
External Contact Author Paumard, V.
External Contact Author De Reau, C.
UniLasalle Beauvais 19 rue Pierre Waguet France External Contact Author O’Leary, M.
External Contact Author Lang, S.
External Contact Publisher Commonwealth of Australia (Geoscience Australia)
Voice
- Purpose
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bathymetry compilation
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Owner Nichol, S.
Place and Communities Internal Contact Point of contact Spinoccia, M.
Place and Communities Internal Contact Resource provider Place and Communities Division
External Contact
- Spatial representation type
Spatial resolution
- Level of detail
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30
- Topic category
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- Geoscientific information
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
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Product data repository: Various Formats
- Protocol
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FILE:DATA-DIRECTORY
- Name of the resource
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Data Store directory containing the digital product files
- Description
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Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- Theme
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Marine
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- Keywords
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Bathymetry
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- Instrument
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Seismic
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- Product
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Bathymetric grids
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- Project
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AusSeabed
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- Keywords
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HVC_146413
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- Keywords
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Published_External
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- Instrument
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Compilation
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- Instrument
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SeisDB
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- Instrument
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Satellite-derived Bathymetry
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- Instrument
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Various
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- Platform
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Sentinel-2
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Bonaparte and Browse basins 3D Seismic derived bathymetry compilation 2022 30m [327.73 MB]
Bonaparte and Browse basins 3D Seismic derived bathymetry compilation 2022 30m [327.73 MB]
- Distribution format
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zip
- File decompression technique
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unzip
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Resource lineage
- Statement
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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.<br>
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The detailed workflow is presented in Lebrec, 2023 (Lebrec, U., Paumard, V., De Reau, C., O’Leary, M.J., and Lang S.C., 2023, Seismic-derived bathymetry data asset, Australia. [in, preparation]) and the Individual processing steps performed on each survey are reported in the supplementary spreadsheet (see attached zip file). It can be summarized as follow:<br>
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1. Data Collection. All publicly available 3D seismic surveys within the area of interest, including PSTM SGY and P190 files were sourced from Nopims and QA/QC.<br>
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2. SGY processing. The first reflector was extracted using PaleoScantm software from each SGY file. The resulting surfaces are in time domain.<br>
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3. P190 Filtering. Navigation files were filtered to extract depth values at the vessel echo-sounder location. If unavailable, the vessel reference point was selected instead. Depth values within P190 files are in metres, but typically obtained using constant velocities. As such, whenever velocities are specified, depth values were converted back to time for further calibration.<br>
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4. Time\depth conversion. All depth values are converted from time to depth using site-specific synthetic velocity profiles derived from WOA2018 salinity and temperature databases using Doris software. <br>
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5. Gridding. Individual surveys were gridded using inverse distance weight algorithm, and exported as 32-bit floating point Geotif. The bin size is defined as the square root of the average area occupied by a point.<br>
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6. Datum Calibration. All grids and point clouds were converted to WGS84 and reduced to EGM2008. To do so, datasets were reduced to LAT using AHO depth sounding as calibration points before being converted to EGM2008 using AusCoastVDT software. It should be noted that LAT and EGM2008 are regarded as equivalent for areas beyond AusCoastVDT coverage, that are typically in water depth of more than 400m (Fig. 2).<br>
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Notes about the spatial and vertical accuracy of the surveys.<br>
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• The vertical accuracy of the reflection-derived bathymetry decreases rapidly in water depths of less than 150 m. Morphologies become vertically distorted and the absolute depths unreliable. In such water depths, values from the navigation-derived bathymetry should be preferred.<br>
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• Navigation-derived bathymetry data transects are often spaced by 500 to 1,000 m, corresponding to the vessel path. Resulting rasters therefore have cell size varying between 50 and 100 m to limit gridding artefacts. When using navigation-derived bathymetry grids, refer to the xyz files for precise measurements.<br>
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• The vertical accuracy could not be precisely determined for each individual survey due to the lack of comparative datasets: MBES data ( http://dx.doi.org/10.26186/5c63832e3ed8e) are sparse and only intersect a few 3D seismic surveys. ENC depth soundings were already used as part of the calibration process and can therefore not be used as an independent dataset. As a result, the vertical accuracy was evaluated using a merged of all MBES datasets available in the region against a merge of the seismic-derived bathymetry grids (Fig. 2). The resulting average vertical accuracy is of 11.51 m (mean average error), which qualifies for the hydrographic accuracy of 1 m +2%d. This value can however vary significantly between surveys. It should be noted that it is often possible to observe a constant vertical offset between MBES and seismic-derived bathymetry grids (Fig. 2) The vertical accuracy of the seabed features relative height is therefore expected to be much higher.<br>
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• ENC depth soundings often show inconsistent values. For example, the mean average difference between ENC depth soundings and MBES depth values is of 10.92 m (Fig. 3). ENC depth soundings are however the only dataset available throughout the area of interest to be used for vertical calibration. This uncertainty was factored in by integrating neighbourhood surveys as well as MBES values whenever possible. <br>
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• 3D Seismic surveys are initially acquired and processed for Oil and Gas exploration to image targets located thousands of meters below the seabed. It is therefore common to observed geometrical distortions at the seabed (e.g., vertical offsets between adjacent surveys are not constant). Such artefacts could not be easily corrected due to the lack of reference surfaces (i.e., ENC datapoints are not dense enough to perform such analysis and Nav datapoints are often not tide corrected). This effect is the main contributor to the vertical uncertainty of the datasets and, as a result, vertical offsets of up to tens of meters can be locally observed between adjacent surveys.<br>
Reference System Information
- Reference system identifier
- EPSG/WGS 84 (EPSG:4326)
Reference System Information
- Reference system identifier
- EPSG/EGM2008 geoid height (EPSG:3855)
Metadata constraints
- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/52cf2b75-a89f-46f3-88cc-64d7762e0409
- Title
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GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Owner Yule, C.
External Contact Point of contact Spinoccia, M.
Place and Communities Internal Contact
Type of resource
- Resource scope
- Dataset
Alternative metadata reference
- Title
-
Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/147396
- Date info (Creation)
- 2020-09-02T06:12:14
- Date info (Revision)
- 2020-09-02T06:12:14
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/144285