Brief description
The Norfolk Island Nearshore and Coastal Habitat Mapping was acquired by Ocean Infinity Pty Ltd onboard the M/V Offshore Solution from the 21st to the 24th July 2021, using a Kongsberg EM2040 Mark II. This survey was part of the Norfolk Island Nearshore and Coastal Habitat Mapping project in partnership with Deakin University’s Marine Mapping Group, University of Wollongong, Tellus4D Geoimaging, University of Newcastle, University of New South Wales, University of Tasmania and Geoscience Australia to obtain high resolution bathymetric grid (1m) and to define the morpho-bathymetry of the survey area based on the bathymetric grid and derived products such as slope aspect map, ruggedness map, bathymetry position index and backscatter map. This dataset contains a 1m-resolution 32-bit floating point GeoTIFF file of the bathymetry in the study area, derived from the processed EM2040 Mark II bathymetry data, using Qimera and CARIS HIPS and SIPS software. A detailed report on the survey is provided in: Ocean Infinity Pty Ltd. 2022. Report of Survey: Norfolk Island Nearshore and Coastal Habitat Mapping. Ocean Infinity Group Limited. This dataset is not to be used for navigational purposes. This dataset is published with the permission of the CEO, Geoscience Australia.
Lineage
Maintenance and Update Frequency: asNeeded
Statement:
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.
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.
Full resolution surfaces available from AHO on request under restricted licence.
Survey metadata:
The multibeam bathymetry was acquired by the following survey:
- Survey Name: Norfolk Island Nearshore and Coastal Habitat Mapping AU420 (20210019S)
- Vessel Name: MV Offshore Solution
- Institution: Ocean Infinity
- Country: Australia
- Operator: Ocean Infinity
- Multibeam system: EM2040 Mark II
- Year of installation: 2021
- Nominal sonar frequency: 300 kHz
- Number of heads: 1
- Number of soundings: 1024
- Beamwidth along track: 0.5 degree
- Beamwidth across track: 1 degree
- Pulse length: variable
- Selectable depth range: 10-61
- Vessel speed: Unknown
- Start Date: 21/07/2021
- End Date: 24/07/2021
- Start Port: Norfolk Island
- End Port: Norfolk Island
- Grid resolution: 1 m
- Number of grids: 1
- Use Limitation: This dataset is not to be used for navigational purposes.
- This dataset is published with the permission of the CEO, Geoscience Australia
- Vertical Datum: MSL
- Horizontal Datum: WGS84 (EPSG:4326)
Processing methodology:
The bathymetric dataset was acquired onboard with Qinsy. First part of the processing worflow was undertaken with Qimera as follow:
1. QPD generation
2. Raytracing with earest in distance withing time
3. Tide correction
4. TPU application
5. Data cleaning
6. QC
7. GSF Export
Second part of the processing workflow was undertaken with Caris Hips & Sips as follows:
1. GSF import
2. Surface Processing
a. Cube surface generation
b. 100% surface check
c. Crossline analysis
d. QC reports
e. Surface finalisation
f. SIC final surface check
4. Export surface as a 32-bit floating Geotiff at 1 m resolustion, referenced to MSL, WGS 84 (EPSG:4326).
DATA QUALITY
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.
Errors found in this dataset should be reported to:
Corporate Data Manager
Geoscience Australia
GPO Box 378
Canberra ACT 2601, Australia
Email: Sales@ga.gov.au
Reported Errors will be rectified in subsequent data releases, if any.
Notes
PurposeAcquiring bathymetry dataset
Created: 08 07 2023
Issued: 31 07 2023
Data time period: 2020-08-27 to 2020-12-21
text: westlimit=167.7697; southlimit=-29.1473; eastlimit=168.1465; northlimit=-28.9142; projection=WGS 84 / geographic 2D (EPSG: 4326)
text: uplimit=-61; downlimit=-12; projection=MSL depth / vertical (EPSG: 5715)
Subjects
AusSeabed |
EARTH SCIENCES |
Earth Science | Oceans | Bathymetry/Seafloor Topography | Bathymetry |
HVC_144641 |
Marine |
Oceans |
Published_External |
bathymetric grids |
bathymetry |
geoscientificInformation |
multibeam |
User Contributed Tags
Login to tag this record with meaningful keywords to make it easier to discover
Other Information
Norfolk Island Nearshore and Coastal Habitat Mapping AU420 Bathymetry 2021 1m (zip) [394.9 MB]
Identifiers
- DOI : 10.26186/148607
- URI : pid.geoscience.gov.au/dataset/ga/148607
- global : 97136a6d-d758-4ed4-911d-9c99b39351c0
