Full description
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.
This dataset is not to be used for navigational purposes.
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.
Survey metadata:
name: AHO Reference Surface Darwin 2023
nb-of-points: 5128
north: -12.0973612
south: -12.4180436
east: 130.7173298
west: 130.4173621
boundingbox-crs: EPSG:4326
start-date: 8-Jul-20
end-date: 8-Jul-20
survey area: Darwin - Beagle Gulf
platform-class: Boat
vessel: N/A
surveyor: N/A
classification: Official
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.
Separate surfaces are provided for the 2 surveyed sites within the survey area."
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.
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."
data-owner: Australian Hydrographic Office, Commonwealth of Australia
custodian: Geoscience Australia, Commonwealth of Australia
point-of-contact: [email protected]
legal-constraints: Creative Commons CC BY 4.0
geodetic-datum: WGS84
projection: UTM 52S
vertical-datum: Mean Sea Level (MSL) | Lowest Astronomical Tide (LAT) | Ellipsoidal Height (ELLIPS)
instrument-type: Multibeam Echosounder (MBES)
sensor-type: R2Sonic 2026, R2Sonic 2024
sensor-frequency: 300 KHz
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.
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.
accepted-soundings-accuracy (unit(m)): 0.15
accepted-positional-accuracy (unit(m)): 0.7
accepted-survey-order: Special Order
accepted-survey-order-url: https://iho.int › pubs › S-44_Edition_6.0.0_EN.pdf
usage-limitation: Not to be used for Navigation
contact-address: 8 Station St, Wollongong, NSW, Australia 2500
GCMD-keyword: EARTH SCIENCE>OCEANS>BATHYMETRY/SEAFLOOR TOPOGRAPHY
GA-keyword: AusSeabed, Bathymetry, Marine, Bathymetry Grids
name of survey contractor: N/A
statement_of_requirements: HIPP Statement of Requirements 2020.1
year of installation: 2020
number of sensor heads: 1
number of soundings: 1024
beamwidth along track (degree): 0.9º x 0.9º
beamwidth across track (degree): 160
pulse length (μs): 15µs – 1ms
absorption (dB/km): 131 dB/km
selectable depth range (m): Variable
vessel speed (kt): 6-7 kt
start port: Darwin Port, NT
end port: Darwin Port, NT
sensor operating mode: Feature Detection
sensor swath (degrees): 0.75° x 1.5°
grid sounding density: 0.5 m
processing software: QPS Qimera 2.2.3
processing methodology: Processed in accordance with HIPP SOR 2020 v1 using CUBE techniques, 0.5 m CUBE surface generated as the final L3 dataset.
grid resolution (m): 0.5
number of grids: 6
Processing methodology:
This dataset was produced using CARIS HIPS & SIPS as follow:
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).
2. Data was provided to Geoscience Australia for publication.
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).
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: [email protected]
Reported Errors will be rectified in subsequent data releases, if any.
Notes
PurposeAcquiring bathymetry dataset
Issued: 21 11 2023
Data time period: 2020-07-08 to 2020-07-08
text: westlimit=130.4174; southlimit=-12.41804; eastlimit=130.7173; northlimit=-12.09736; projection=WGS 84 / UTM zone 52S / projected (EPSG: 32752)
text: uplimit=-21; downlimit=-31; projection=MSL depth / vertical (EPSG: 5715)
Subjects
AusSeabed |
EARTH SCIENCES |
Earth Science | Oceans | Bathymetry/Seafloor Topography | Bathymetry |
HVC_144641 |
Oceans |
Published_External |
bathymetric grids |
bathymetry |
geoscientificInformation |
marine |
multibeam |
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Other Information
AHO Reference Surface (Cairns) 2023 0.5m (zip) [299.4 MB]
url :
https://files.ausseabed.gov.au/survey/AHO%20Reference%20Surface%20(Darwin)%202023%200.5m.zip
Identifiers
- DOI : 10.26186/149075
- URL : pid.geoscience.gov.au/dataset/ga/149075
- global : 4d14b504-50fb-4c7a-ac5a-0b242dc4fbe3
