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Petrel Sub-basin Marine Survey (GA-0335 / SOL5463) (NLECI Program) - High Resolution Bathymetry GridsNote: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2. Dataset citationANZLIC unique identifier: ANZCW0703016622 Title: Petrel Sub-basin Marine Survey (GA-0335 / SOL5463) (NLECI Program) - High Resolution Bathymetry Grids CustodianCustodian: Geoscience Australia Jurisdiction: Australia DescriptionAbstract: The Petrel Sub-basin Marine Environmental Survey GA-0335 was acquired by the RV Solander during May 2012 as part of the Commonwealth Government's National Low Emission Coal Initiative (NLECI). The survey was undertaken as a collaboration between Geoscience Australia and the Australian Institute of Marine Science (AIMS). The purpose was to acquire geophysical and biophysical data on shallow (less than 100m water depth) seabed environments within two targeted areas in the Petrel Sub-basin to support investigation for CO2 storage potential in these areas. The bathymetry processing onboard the Solander was carried through by IX surveys for the first leg and by Justy Siwabessy on the second leg. Back in Geoscience Australia, the swath processing for all the files (from port to port) was conducted by Michele Spinoccia. Swath data was processed through Caris HIPS/SIPS version 7.1. 1. First a vessel configuration file was created where the co-ordinates of the motion sensor and DGPS antenna and patch test offsets were recorded. 2. A new project was then created and the vessel configuration file was attached to the project file. 3. The raw swath sonar data, in raw.all format, for each line was then imported into the project and the vessel information assigned to the data. 4. The motion sensor, DGPS and heading data were then cleaned using a filter that averaged adjacent data to remove artifacts. 5. Different sound velocity profiles data for each block were attached to the corresponding raw swath sonar data files to correct the depths for changes in the speed of sound through the water column. 6. Then a new blank field area was defined that specified the geographic area of study and the co-ordinate system used. The co-ordinates for the study areas were WGS84 UTM-52S. 7. The data was cleaned by applying several filters that removed any remaining spikes in the bathymetry data using user defined threshold values. A visual inspection of the data for each line was then undertaken where artifacts and noisy data not removed by the filtering process were removed manually using Swath and subset editors modules of the Caris HIPS/SIPS software. 8. All the data for each bathymetric, motion sensor, DGPS, heading, tide and sound velocity profile data were merged to produce the final processed data file. A weighted grid of the processed data was then created for each Block. In GA the GPS tide was extracted from the bathymetry data and applied to the grid to correct for tidal variations and velocity corrections were performed to correct for different artifacts and mismatches. 9. The processed data was finally exported as grids soundings or false colored images for presentation and reporting and as final processed data in in ASCII XYZ as well as geotif formats of 2m resolution. 10- Using CARIS Base editor 4.0 the grids were exported as ESRI ASCII grid, then imported into ARC catalogue/info to create a raster file for all of the five grids. ANZLIC search words:
Spatial domain:
Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia Geographic extent polygon: 128.75 -12.25, 130.833 -12.25, 130.833 -13, 128.75 -13, 128.75 -12.25, Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register
Data currencyBeginning date: 2012-05-04 Ending date: 2012-05-30 Dataset statusProgress: Complete Maintenance and update frequency: Not Known Access
Access constraints: The material is released under the Creative Common Attribution 3.0 Australia Licence. The bathymetry grids are not to be used for any navigational purposes. Free Data DownloadData qualityLineage: The multibeam bathymetry was acquired from the following survey: # Survey Name Vessel Name Multibeam System Institution Start Date End Date Start Port End Port 1 GA-0335_Petrel Sub basin SOL543 RV_Solander EM3002D GA 03/5/2012 31/5/2012 Darwin Darwin Five 2m resolution grids were produced. Positional accuracy: Visual assessment of the grids indiactes that its logical consistency is good. Inherited from raw data in which C-NAV system was used to provide geographical position with a manufacturer accuracy of 10 cm RMS. Inherited from raw data in which Applanix system was used to provide roll and pitch, and heave with manufacturer accuracies for roll and pitch are 0.05 deg. RMS, and manufacturer accuracy for heave is 5 cm Attribute accuracy: The accuracy is high but it is cell size dependent. Note that the water depth dictates the cell size. Logical Consistency: All procedures, steps and software involved in producing a bathymetry grid are similar. Visual assessment of the grids indicates that its logical consistency is good. Each of the survey input dataset was examined in detail and edited where necessary. Completeness: All of the data acquired during this survey was used to produce the grids. Contact information
Metadata informationMetadata date: 2013-03-08 Additional metadataMetadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703016622.html Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703016622.xml Processing software: Caris HIPS & SIPS 7.1 Survey Name: Petrel Sub Basin marine environmental survey Vessel: RV Solander Country: Australia Operator: AIMS Bathymetric system used: Kongsberg EM3002D Year of installation: 2012 Nominal sonar frequency: 300 kHz Number of beams: 320 beams Beamwidth across track: 1.5 degrees Beamwidth along track : 1.5 degrees Pulse length: Variable, operator selectable Depth range: 0m - 110m Vessel peed: 6 - 7 knots Start date of survey: 03 May 2012 End date of survey: 31 May 2012 Institution: Geoscience Australia Start port: Darwin End port: Darwin Survey leaders: Tony Nicholas Data acquired and processed by: IXSurvey, Ian Atkinson, Justy Siwabessy, Mike Sexton and Michele Spinoccia. Grids resolution: 2m Number of grids: 5 This dataset consist of the following files: - XYZ grid in 2m resolution, projected in Eastings and Northing UTM 52S, WGS84 - ESRI Raster in 2m resolution. - Georeferenced colour tif image in 1m resolution, shaded with sun azimuth 45 degrees. - Caris csar fi Authors:Spinoccia, M. |
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