Authors / CoAuthors
Australian Hydrographic Office | Commonwealth of Australia (Australian Hydrographic Office)
Abstract
<div>The Darwin Reference Surfaces bathymetry survey was acquired for the Australian Hydrographic Office (AHO) on 8 Jul 2020. This surface was created from a contracted national reference survey in Darwin NT, collected for the purpose of calibrating multibeam echosounders. It was conducted for the Australian Hydrographic Office as part of the Hydroscheme Industry Partnership Program, acquired using R2Sonic 2026 and R2Sonic 2024, and processed using QPS Qimera. Separate grids in 0.5m resolution are provided for the two surveyed sites within this survey area in MSL, LAT and Ellipsoid vertical datum. The dataset was then exported as a 0.5m resolution, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>
Product Type
dataset
eCat Id
149075
Contact for the resource
Point of contact
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Owner
Point of contact
Resource provider
Digital Object Identifier
Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- GCMD Keywords
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- Earth Science | Oceans | Bathymetry/Seafloor Topography | Bathymetry
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- bathymetry
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- multibeam
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- bathymetric grids
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- AusSeabed
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- HVC_144641
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- Oceans
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- Published_External
- ( {1} )
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- marine
Publication Date
2023-11-21T23:10:44
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Acquiring bathymetry dataset
Maintenance Information
asNeeded
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>Survey metadata:</div><div>name: AHO Reference Surface Darwin 2023</div><div>nb-of-points: 5128</div><div>north: -12.0973612</div><div>south: -12.4180436</div><div>east: 130.7173298</div><div>west: 130.4173621</div><div>boundingbox-crs: EPSG:4326</div><div>start-date: 8-Jul-20</div><div>end-date: 8-Jul-20</div><div>survey area: Darwin - Beagle Gulf</div><div>platform-class: Boat</div><div>vessel: N/A</div><div>surveyor: N/A</div><div>classification: Official</div><div>abstract: "These surfaces were created from a contracted national reference survey in Darwin, NT, collected for the purpose of calibrating mutlibeam echosounders. It was conducted for the Australian Hydrographic Office as part of the Hydroscheme Industry Partnership Program.</div><div>Separate surfaces are provided for the 2 surveyed sites within the survey area."</div><div>Lineage (Description): "These surfaces are 0.5 metre Shoal Depth True Position (SDTP) surfaces derived from International Hydrographic Organisation (IHO) Special Order survey, with 0.5 metre Combined Uncertainty and Bathymetry Estimator (CUBE) surfaces supplied to the Australian Hydrographic Office (AHO), with depth, position, density and uncertainty preserved from the original surfaces. </div><div>AHO Reference Surfaces are created for use as a reference surface for calibration of MBES systems. The AHO recommends using them in their native coordinate reference system, as reprojection algorithms may introduce spatial errors. This dataset is only available for download from AHO."</div><div>data-owner: Australian Hydrographic Office, Commonwealth of Australia</div><div>custodian: Geoscience Australia, Commonwealth of Australia</div><div>point-of-contact: hydro.licensing@defence.gov.au</div><div>legal-constraints: Creative Commons CC BY 4.0</div><div>geodetic-datum: WGS84</div><div>projection: UTM 52S</div><div>vertical-datum: Mean Sea Level (MSL) | Lowest Astronomical Tide (LAT) | Ellipsoidal Height (ELLIPS)</div><div>instrument-type: Multibeam Echosounder (MBES)</div><div>sensor-type: R2Sonic 2026, R2Sonic 2024</div><div>sensor-frequency: 300 KHz</div><div>horizontal-positioning-method: Applanix POS MV Wavemaster II (Limitless), and POS MV 320 (Zephyr). Position was provided by Fugro Marine Star G2+ satellite corrected solution.</div><div>vertical-reduction-method: The data was collected using the native GNSS coordinate system, and converted to Ellipsoidal Height (ELL) by the contractor. The data were reduced from GNSS coordinates to Lowest Astronomical Tide (LAT) using an AHO-approved tidal model based on observed tides and adjusted to Mean Sea Level (MSL) by AHO.</div><div>accepted-soundings-accuracy (unit(m)): 0.15</div><div>accepted-positional-accuracy (unit(m)): 0.7</div><div>accepted-survey-order: Special Order</div><div>accepted-survey-order-url: https://iho.int › pubs › S-44_Edition_6.0.0_EN.pdf</div><div>usage-limitation: Not to be used for Navigation</div><div>contact-address: 8 Station St, Wollongong, NSW, Australia 2500</div><div>GCMD-keyword: EARTH SCIENCE>OCEANS>BATHYMETRY/SEAFLOOR TOPOGRAPHY</div><div>GA-keyword: AusSeabed, Bathymetry, Marine, Bathymetry Grids</div><div>name of survey contractor: N/A</div><div>statement_of_requirements: HIPP Statement of Requirements 2020.1</div><div>year of installation: 2020</div><div>number of sensor heads: 1</div><div>number of soundings: 1024</div><div>beamwidth along track (degree): 0.9º x 0.9º</div><div>beamwidth across track (degree): 160</div><div>pulse length (μs): 15µs – 1ms</div><div>absorption (dB/km): 131 dB/km</div><div>selectable depth range (m): Variable</div><div>vessel speed (kt): 6-7 kt</div><div>start port: Darwin Port, NT</div><div>end port: Darwin Port, NT</div><div>sensor operating mode: Feature Detection</div><div>sensor swath (degrees): 0.75° x 1.5°</div><div>grid sounding density: 0.5 m</div><div>processing software: QPS Qimera 2.2.3 </div><div>processing methodology: Processed in accordance with HIPP SOR 2020 v1 using CUBE techniques, 0.5 m CUBE surface generated as the final L3 dataset.</div><div>grid resolution (m): 0.5</div><div>number of grids: 6</div><div><br></div><div><br></div><div>Processing methodology:</div><div>This dataset was produced using CARIS HIPS & SIPS as follow:</div><div>1. Processed in accordance with HIPP SOR 2020v 1.2 using CUBE techniques, 0.5m CUBE surfaces generated as the final L3 product (a gridded surface derived from cleaned point data).</div><div>2. Data was provided to Geoscience Australia for publication.</div><div>3. The final processed grid was exported as a 32-bit floating point Geotiff at 0.5m resolution, referenced to MSL, WGS 84 (EPSG:32752).</div><div><br></div><div>DATA QUALITY</div><div><br></div><div>This dataset has been subject to independent post-production validation and testing. Tests have been performed for data completeness, correct spatial representation, attribute accuracy, logical consistency, metadata completeness and correctness, and where appropriate for compliance with Geoscience Australia's data dictionaries.</div><div>Errors found in this dataset should be reported to:</div><div>Corporate Data Manager</div><div>Geoscience Australia</div><div>GPO Box 378</div><div>Canberra ACT 2601, Australia</div><div>Email: Sales@ga.gov.au</div><div>Reported Errors will be rectified in subsequent data releases, if any.</div><div><br></div>
Parent Information
Extents
[-12.41804, -12.09736, 130.4174, 130.7173]
Reference System
WGS 84 / UTM zone 52S / projected (EPSG: 32752)
Spatial Resolution
Service Information
Associations
Source Information