Authors / CoAuthors
Lebrec, U. | Paumard, V. | De Reau, C. | O'Leary, M. | Lang, S.
Abstract
<div>The Southwest Margins seismic-derived bathymetry was produced in 2023 as part of a collaboration between The University of Western Australia and the AusSeabed Community. The compilation integrates 19 bathymetry grids derived from available and workable 3D seismic datasets into a 30 m resolution 32-bit GeoTIFF, including both reflection and navigation derived data. 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.</div><div><br></div><div>This dataset is not to be used for navigational purposes.</div><div><br></div>
Product Type
dataset
eCat Id
148610
Contact for the resource
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Owner
- Contact instructions
- Place and Communities
Point of contact
- Contact instructions
- Place and Communities
Resource provider
Digital Object Identifier
Keywords
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- Marine
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- Bathymetry
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- Seismic
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- Bathymetric Grids
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- AusSeabed
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- HVC_146413
- ( Instrument )
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- Compilation
- ( Instrument )
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- SeisDB
- theme.ANZRC Fields of Research.rdf
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- Earth Sciences
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- Published_External
Publication Date
2023-08-01T07:40:30
Creation Date
2023-03-30T21:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
Bathymetry Compilation
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
<div>AusSeabed follows the recommended processing methodology as prescribed by the AusSeabed Multibeam Guidelines. Please note that certain products are subject to routine update (e.g. resolution, coverage, temporal variation, guidelines/best practice). The client is advised to refer to the latest version of all documents and products for the mostup-to-date material. For eCat records the version is expressed in the record title whilst products incorporate date of production as per AusSeabed’s file naming convention.</div><div><br></div><div>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. 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:</div><div><br></div><div>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.</div><div><br></div><div>2. SGY processing. The first reflector was extracted using PaleoScan™ software from each SGY file. The resulting surfaces are in time domain.</div><div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>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).</div>
Parent Information
Extents
[-35.29097, -27.18827, 112.7248, 131.6227]
Reference System
WGS 84 / geographic 2D (EPSG: 4326)
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information