<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

<br>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>aho_id: 49391833</div><div>name: AHO Reference Surface Broome 2023</div><div>nb-of-points: 4</div><div>north: -17.88544479</div><div>south: -17.89026362</div><div>east: 122.0703717</div><div>west: 122.0652449</div><div>boundingbox-crs: EPSG:4326</div><div>start-date: 25/09/2020</div><div>end-date: 26/09/2020</div><div>survey area: Northern Approaches to Broome</div><div>platform-class: Boat</div><div>vessel: N/A</div><div>surveyor: N/A</div><div>classification: Official</div><div>abstract: This is reference surface, derived from a contracted survey conducted for the Australian Hydrographic Office for the purpose of calibrating multibeam echosounders. It was collected as part of the Hydroscheme Industry Partnership Program. The survey area lies between Gantheaume Point and Talboys Rock, Broome WA.</div><div>Lineage (Description): "This surface is a 0.5 metre Shoal Depth True Position (SDTP) surface derived from International Hydrographic Organisation (IHO) Special Order survey, with an 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 surface.&nbsp;&nbsp;</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. Therefore, 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: ITRF2014 GRS80</div><div>projection: UTM 51S</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: Kongsberg EM 2040D</div><div>sensor-frequency: 300 KHz</div><div>horizontal-positioning-method: Applanix POS MV Oceanmaster (Primary) and Applanix POS MV Wavemaster (secondary) Position was provided by Marine Star G4+ PPP GNSS.</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)): 0.23</div><div>accepted-positional-accuracy (unit(m)): 0.5</div><div>accepted-survey-order: Special Order</div><div>accepted-survey-order-url: hydro.licensing@defence.gov <br>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>aho_id: 49391833</div><div>name: AHO Reference Surface Broome 2023</div><div>nb-of-points: 4</div><div>north: -17.88544479</div><div>south: -17.89026362</div><div>east: 122.0703717</div><div>west: 122.0652449</div><div>boundingbox-crs: EPSG:4326</div><div>start-date: 25/09/2020</div><div>end-date: 26/09/2020</div><div>survey area: Northern Approaches to Broome</div><div>platform-class: Boat</div><div>vessel: N/A</div><div>surveyor: N/A</div><div>classification: Official</div><div>abstract: This is reference surface, derived from a contracted survey conducted for the Australian Hydrographic Office for the purpose of calibrating multibeam echosounders. It was collected as part of the Hydroscheme Industry Partnership Program. The survey area lies between Gantheaume Point and Talboys Rock, Broome WA.</div><div>Lineage (Description): "This surface is a 0.5 metre Shoal Depth True Position (SDTP) surface derived from International Hydrographic Organisation (IHO) Special Order survey, with an 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 surface.&nbsp;&nbsp;</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. Therefore, 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: ITRF2014 GRS80</div><div>projection: UTM 51S</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: Kongsberg EM 2040D</div><div>sensor-frequency: 300 KHz</div><div>horizontal-positioning-method: Applanix POS MV Oceanmaster (Primary) and Applanix POS MV Wavemaster (secondary) Position was provided by Marine Star G4+ PPP GNSS.</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)): 0.23</div><div>accepted-positional-accuracy (unit(m)): 0.5</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 SOR v2020.2</div><div>year of installation: 2020</div><div>number of sensor heads: 2</div><div>number of soundings: 800</div><div>beamwidth along track (degree): 1.0°</div><div>beamwidth across track (degree): max 70°</div><div>pulse length (μs): 200μs</div><div>absorption (dB/km): 108.3-132.04 dB/km</div><div>selectable depth range (m): variable</div><div>vessel speed (kt): 6-8 knots</div><div>start port: Darwin, NT</div><div>end port: Darwin, NT</div><div>sensor operating mode: Dual Swath Mode</div><div>sensor swath (degrees): 70° (140° total)</div><div>grid sounding density: 0.5</div><div>processing software: CARIS HIPS AND SIPS 11.3.9</div><div>processing methodology: Processed in accordance with HIPP SOR 2021.2 using CUBE algorithm techniques, 1 and 2m CUBE surfaces generated as the final L3 dataset.</div><div>grid resolution (m): 0.5</div><div>number of grids: 3</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, ITRF2014 GRS80 UTM Zone 51S.</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> Sales@ga.gov › 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 SOR v2020.2</div><div>year of installation: 2020</div><div>number of sensor heads: 2</div><div>number of soundings: 800</div><div>beamwidth along track (degree): 1.0°</div><div>beamwidth across track (degree): max 70°</div><div>pulse length (μs): 200μs</div><div>absorption (dB/km): 108.3-132.04 dB/km</div><div>selectable depth range (m): variable</div><div>vessel speed (kt): 6-8 knots</div><div>start port: Darwin, NT</div><div>end port: Darwin, NT</div><div>sensor operating mode: Dual Swath Mode</div><div>sensor swath (degrees): 70° (140° total)</div><div>grid sounding density: 0.5</div><div>processing software: CARIS HIPS AND SIPS 11.3.9</div><div>processing methodology: Processed in accordance with HIPP SOR 2021.2 using CUBE algorithm techniques, 1 and 2m CUBE surfaces generated as the final L3 dataset.</div><div>grid resolution (m): 0.5</div><div>number of grids: 3</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, ITRF2014 GRS80 UTM Zone 51S.</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>