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NSW Continental Slopes Survey (GA-2413/SS10/2006) - 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: ANZCW0703016838 Title: NSW Continental Slopes Survey (GA-2413/SS10/2006) - Bathymetry grids CustodianCustodian: Geoscience Australia Jurisdiction: Australia DescriptionAbstract: The NSW Continental Slopes survey GA-2413, SS10/2006 was acquired by Geoscience australia onboard the RV Southern Surveyor from the 12th of October to the 25th of October 2006. The geographical range stretched from Jervis bay in the South to Port Stephens in the North. The aim was to assess the physical nature of the NSW continental slope, improve our understanding of the surface and subsurface structure of the continental slope and to investigate the history of sediment movement along the continental slope. This dataset was acquired and processed onboard by Andrea and Michele Spinoccia and further processing was done in the office by Michele Spinoccia. The bathymetry data was gridded at a 50m resolution grid and was projected into WGS84 UTM zone 56S. Swath data was processed through Caris HIPS/SIPS version 7.1.2 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-56S. 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 tide was 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 50m 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 the entire survey. ANZLIC search words:
Spatial domain:
Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia Geographic extent polygon: 150.95 -31.85, 153.32 -31.85, 153.32 -35.31, 150.95 -35.31, 150.95 -31.85, Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register
Data currencyBeginning date: 2012-10-12 Ending date: 2012-10-25 Dataset statusProgress: Complete Maintenance and update frequency: Not Known Access
Access constraints: this material is released under the Creative Common Attribution 3.0 Australia Licence Free Data DownloadData qualityLineage: # Survey Name Vessel Name Multibeam System Institution Start Date End Date Start Port End Port 1 GA-2413 NSW Slopes SS10/2006 RV_Southern Surveyor EM300 GA 12/10/2006 25/10/2006 Sydney Sydney Positional accuracy: Visual assessment of the grids indicates that its logical consitancy is good. 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/ANZCW0703016838.html Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703016838.xml Processing software: Caris HIPS & SIPS 7.1 Survey Name: NSW Continental Slopesl survey (GA-2413/SS10/2006) Vessel: RV Southern Surveyor Country: Australia Operator: CSIRO Bathymetric system used: Kongsberg EM300 Year of installation: 2004 Nominal sonar frequency: 30 kHz Number of beams: 135 beams Beamwidth across track: 1 degrees Beamwidth along track : 1 degrees Pulse length: Variable, operator selectable Depth range: 10m - 5000m Vessel peed: 6 - 7 knots Start date of survey: 12 October 2006 End date of survey:251October 2006 Institution: Geoscience Australia Start port: Sydney End port: Sydney Survey leaders: Dr. Kriton Glenn Data acquired and processed by: Andrea and Michele Spinoccia. Grids resolution: 50m Number of grids: 1 This dataset consist of the following files: - XYZ grid in 50m resolution, projected in Eastings and Northing UTM 56S, WGS84 - ESRI Raster in 50m resolution. - Georeferenced colour tif image in 50m resolution, shaded with sun azimuth 45 degrees. - Caris csar and csar0 files Authors:Spinoccia M. |
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