Brief description
The Cairns Reference Surfaces bathymetry survey was acquired for the Australian Hydrographic Office (AHO) on 27 May 2020. This surface was created from a contracted national reference survey in Cairns QLD, 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 2022, and processed using Caris HIPS & SIPS. Seperate grids in 0.5m resolution are provided for the three 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.
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:
aho_id: 49391826
name: AHO Reference Surface Cairns 2023
nb-of-points: 10331
north: -16.7070117
south: -16.7806956
east: 146.1981217
west: 145.7833617
boundingbox-crs: EPSG:4326
start-date: 27-May-20
end-date: 27-May-20
survey area: Cairns, QLD
platform-class: Boat
vessel: N/A
surveyor: N/A
classification: Official
abstract: "These surfaces were created for the purpose of calibrating multibeam echosounders from a contracted national reference survey in Cairns, QLD conducted for the Australian Hydrographic Office as part of the Hydroscheme Industry Partnership Program.
Separate surfaces are provided for the 3 surveyed sites within the overal 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. 0.5 metre Combined Uncertainty and Bathymetry Estimator (CUBE) surfaces were supplied to the Australian Hydrographic Office (AHO), with depth, position, density and uncertainty preserved from the original surface.
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."
data-owner: Australian Hydrographic Office, Commonwealth of Australia
custodian: Geoscience Australia, Commonwealth of Australia
point-of-contact: hydro.licensing@defence.gov.au
legal-constraints: Creative Commons CC BY 4.0
geodetic-datum: ITRF2014
projection: Transverse Mercator
vertical-datum: Mean Sea Level (MSL) | Lowest Astronomical Tide (LAT) | Ellipsoidal Height (ELLIPS)
instrument-type: Multibeam Echosounder (MBES)
sensor-type: R2 Sonic 2022
sensor-frequency: 400 KHz
horizontal-positioning-method: Septentrio AsterRx-U augmented with Marinestar (Fg Model) and integrated with iXBlue HYDRINS motion sensor.
vertical-reduction-method: The data was collected using the GPS coordinate system, and converted to Ellipsoidal Height (ELL) by the contractor. The data were reduced from GPS 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)): 0.11
accepted-positional-accuracy (unit(m)): 0.5
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): N/A
selectable depth range (m): N/A
vessel speed (kt): 11
start port: Cairns, QLD
end port: Cairns, QLD
sensor operating mode: Single head - feature detection mode
sensor swath (degrees): 160
grid sounding density: 0.5 m
processing software: CARIS HIPS and SIPS 11.3.3
processing methodology: Processed in accordance with HIPP SOR 2020.1 using CUBE techniques, 1 and 2m CUBE surfaces generated as the final L3 dataset.
grid resolution (m): 0.5
number of grids: 9
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, ITRF2014/Transverse Mercator.
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
Data time period: 2021-12-12 to 2021-12-12
text: westlimit=145.7834; southlimit=-16.7807; eastlimit=146.1981; northlimit=-16.70701; projection=WGS 84 / UTM zone 55S / projected (EPSG: 32755)
text: uplimit=-16; downlimit=-68; 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]
uri :
https://files.ausseabed.gov.au/survey/AHO%20Reference%20Surface%20(Cairns)%202023%200.5m.zip
Identifiers
- DOI : 10.26186/149078
- URI : pid.geoscience.gov.au/dataset/ga/149078
- global : 40e8cbbe-df2a-4383-88f2-0215f3fe02e3
