<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>This surface is a 30 metre Shoal Depth True Position (SDTP) surface derived from International Hydrographic Organisation (IHO) Order 1A, 1 and 2 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.</div><div>Full resolution surfaces available from AHO on request under restricted licence.</div><div><br></div><div>Survey metadata:</div><div>The multibeam bathymetry was acquired by the following survey:</div><div>- Survey Name: Norfolk Island Nearshore and Coastal Habitat Mapping AU420 (20210019S)</div><div>- Vessel Name: MV Offshore Solution</div><div>- Institution: Ocean Infinity</div><div>- Country: Australia</div><div>- Operator: Ocean Infinity</div><div>- Multibeam system: EM2040 Mark II</div><div>- Year of installation: 2021</div><div>- Nominal sonar frequency: 300 kHz</div><div>- Number of heads: 1</div><div>- Number of soundings: 1024</div><div>- Beamwidth along track: 0.5 degree</div><div>- Beamwidth across track: 1 degree</div><div>- Pulse length: variable</div><div>- Selectable depth range: 10-61</div><div>- Vessel speed: Unknown</div><div>- Start Date: 21/07/2021</div><div>- End Date: 24/07/2021</div><div>- Start Port: Norfolk Island</div><div>- End Port: Norfolk Island</div><div>- Grid resolution: 1 m</div><div>- Number of grids: 1</div><div>- Use Limitation: This dataset is not to be used for navigational purposes.</div><div>- This dataset is published with the permission of the CEO, Geoscience Australia</div><div>- Vertical Datum: MSL</div><div>- Horizontal Datum: WGS84 (EPSG:4326)</div><div><br></div><div><br></div><div>Processing methodology:</div><div>The bathymetric dataset was acquired onboard with Qinsy. First part of the processing worflow was undertaken with Qimera as follow:</div><div>1. QPD generation</div><div>2. Raytracing with earest in distance withing time</div><div>3. Tide correction</div><div>4. TPU application</div><div>5. Data cleaning</div><div>6. QC</div><div>7. GSF Export</div><div>Second part of the processing workflow was undertaken with Caris Hips & Sips as follows:</div><div>1. GSF import</div><div>2. Surface Processing </div><div> a. Cube surface generation</div><div> b. 100% surface check</div><div> c. Crossline analysis</div><div> d. QC reports</div><div> e. Surface finalisation</div><div> f. SIC final surface check</div><div>4. Export surface as a 32-bit floating Geotiff at 1 m resolustion, referenced to MSL, WGS 84 (EPSG:4326).</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> Sales@ga.gov <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>This surface is a 30 metre Shoal Depth True Position (SDTP) surface derived from International Hydrographic Organisation (IHO) Order 1A, 1 and 2 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.</div><div>Full resolution surfaces available from AHO on request under restricted licence.</div><div><br></div><div>Survey metadata:</div><div>The multibeam bathymetry was acquired by the following survey:</div><div>- Survey Name: Norfolk Island Nearshore and Coastal Habitat Mapping AU420 (20210019S)</div><div>- Vessel Name: MV Offshore Solution</div><div>- Institution: Ocean Infinity</div><div>- Country: Australia</div><div>- Operator: Ocean Infinity</div><div>- Multibeam system: EM2040 Mark II</div><div>- Year of installation: 2021</div><div>- Nominal sonar frequency: 300 kHz</div><div>- Number of heads: 1</div><div>- Number of soundings: 1024</div><div>- Beamwidth along track: 0.5 degree</div><div>- Beamwidth across track: 1 degree</div><div>- Pulse length: variable</div><div>- Selectable depth range: 10-61</div><div>- Vessel speed: Unknown</div><div>- Start Date: 21/07/2021</div><div>- End Date: 24/07/2021</div><div>- Start Port: Norfolk Island</div><div>- End Port: Norfolk Island</div><div>- Grid resolution: 1 m</div><div>- Number of grids: 1</div><div>- Use Limitation: This dataset is not to be used for navigational purposes.</div><div>- This dataset is published with the permission of the CEO, Geoscience Australia</div><div>- Vertical Datum: MSL</div><div>- Horizontal Datum: WGS84 (EPSG:4326)</div><div><br></div><div><br></div><div>Processing methodology:</div><div>The bathymetric dataset was acquired onboard with Qinsy. First part of the processing worflow was undertaken with Qimera as follow:</div><div>1. QPD generation</div><div>2. Raytracing with earest in distance withing time</div><div>3. Tide correction</div><div>4. TPU application</div><div>5. Data cleaning</div><div>6. QC</div><div>7. GSF Export</div><div>Second part of the processing workflow was undertaken with Caris Hips & Sips as follows:</div><div>1. GSF import</div><div>2. Surface Processing </div><div> a. Cube surface generation</div><div> b. 100% surface check</div><div> c. Crossline analysis</div><div> d. QC reports</div><div> e. Surface finalisation</div><div> f. SIC final surface check</div><div>4. Export surface as a 32-bit floating Geotiff at 1 m resolustion, referenced to MSL, WGS 84 (EPSG:4326).</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>