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XYZ multibeam bathymetric grids of the Macquarie RidgeNote: 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: ANZCW0703015735 Title: XYZ multibeam bathymetric grids of the Macquarie Ridge CustodianCustodian: Geoscience Australia Jurisdiction: Australia DescriptionAbstract: The compilation and processing of GA's bathymetric data in the Macquarie Ridge region was produced following a request by an internal client in December 2011 of all the multibeam data in GA's data holding that are publicly released. This data was acquired by 7 research vessels, the RV Rig Seismic, RV Sonne, N/O L'Atalante from IFREMER, the Lamont-Doherty Earth Observatory R.V. Maurice Ewing, the U.S. National Science Foundation R.V.Nathaniel B. Palmer, the Scripps Institution of Oceanography RV Roger Revelle and the United States Coast Guard USCGC Healy. The Macquarie Ridge was divided into two grids: a- Macquarie_ALL_1 grid and extends from Longitude 156? to 162? East, and Latitude -49? to -61? South WGS UTM 57 b- Macquarie_ALL_2 grid and extends from Longitude 162? to 166 East and Latitude -49? to -53? South, WGS UTM 58 This data was acquired by 7 research vessels, the RV Rig Seismic, RV Sonne, N/O L'Atalante from IFREMER, the Lamont-Doherty Earth Observatory R.V. Maurice Ewing, the U.S. National Science Foundation R.V.Nathaniel B. Palmer, the Scripps Institution of Oceanography RV Roger Revelle and the United States Coast Guard USCGC Healy The Macquarie Ridge was divided into two grids: a- Macquarie_ALL_1 grid and extends from Longitude 156? to 162? East, and Latitude -49? to -61? South WGS UTM 57 b- Macquarie_ALL_2 grid and extends from Longitude 162? to 166 East and Latitude -49? to -53? South, WGS UTM 58 This study of Macquarie Ridge lies in a bounding area of Latitude -49 to -61 South and Longitude 156 to 166 East. The area of interest extends over an area of 216,979.56 Km2 in water depth ranging from 70 to 6700 meters. Geoscience Australia conducted a study of the geology of the Macquarie Ridge in 1994. The bathymetric survey, GA-0124_Macquarie Ridge, started the 8th of January 1994 and ended on the 21st of February 1994, was conducted onboard the Rig Seismic using an MR1 seafloor mapping system. The GA-0124 Macquarie Ridge survey makes the major part of the bathymetric data acquired in that area. Due to the exceptionally good quality data being acquired, post processing of the raw data was kept to a minimum, which meant that we were able to keep up with the data volumes. 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-57S.and WGS84-58S 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 9. The processed data was finally exported as grids soundings or false colored images for presentation and reporting and as final processed data in GSF format as well as in ASCII XYZ. ANZLIC search words:
Spatial domain:
Geographic extent name: AUSTRALIA INCLUDING EXTERNAL TERRITORIES - AUSAAT - Australia - Australia Geographic extent polygon: 156 -49, 166 -49, 166 -61, 156 -61, 156 -49, Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register
Data currencyBeginning date: 2012-02-10 Ending date: 2012-03-01 Dataset statusProgress: Complete Maintenance and update frequency: Not Known Access
Access constraints: This data is released under the Creative Common Attribution 3.0 Australia Licence The bathymetry grids are not to be used for any navigational puprposes. Free Data DownloadData qualityLineage: # Survey Name Vessel Name Multibeam System Institution Start Date End Date Start Port End Port 1 GA-0124_MacquarieRidge_MR1 RV_Rig_Seismic MR1 (12 kHz) GA 8/01/1994 21/02/1994 Sydney Sydney 2 GA-0212_TASQWA_SO136 RV_Sonne Atlas hydrosweep DS (15.5 kHz) IFM-GEOMAR 16/10/1998 12/11/1998 Wellington Hobart 3 GA-0223_Austrea2 NO_L'Atalante EM120 (12 kHz) AGSO/IFREMER 15/01/2000 9/02/2000 Hobart Bluff,NZ 4 GA-1705_EW9513 RV_Maurice_Ewing Atlas hydrosweep DS (14-16 kHz) LDGO 28/12/1995 2/02/1996 Auckland Lyttleton 5 GA-1824_NBP9702 RV_Nathaniel_Palmer SeaBeam2112 (12 kHz) ASA 15/02/1997 24/03/1997 McMurdo Lyttleton 6 GA-2328_NBP0209 RV_Nathaniel_Palmer EM120 (12 kHz) LDEO 12/12/2002 1/01/2003 Lyttleton McMurdo 7 GA-2404_NBP0501 RV_Nathaniel_Palmer EM120 (12 kHz) LDEO 28/01/2005 15/02/2005 McMurdo Lyttleton 8 GA-2493_KNOX03RR RV_Roger_Revelle EM120 (12 kHz) SIO/NSF 6/02/2007 21/03/2007 Dunedin Fremantle 9 GA-4305_HLY03DF USCGC_Healy SeaBeam 2112 (12 kHz) USCG 9/01/2003 3/04/2003 Seattle Seattle Positional accuracy: Visual assessment of the grids indicates that its logical consistency is good. The vessels used a DGPS and four antannae connected to GPS receiver with an accuracy of 1 to 2 m. Attribute accuracy: High quality swath bathymetric data that form an aerial coverage exists, overlapping swaths and speed of sound corrections shows that the data are quite accurate. Some transit swath data also have speed of sound corrections applied and are assumed to be highly accurate. Other transit swath surveys have utilized a nominal speed of sound of 1500m/s and are not as accurate. Logical Consistency: Visual assessment of the grids indicates that its logical consistency is good. Each of the area input dataset was examined in detail and edited where necessary. The Macquarie Ridge bathymetric grids were compiled from different intersected generic surveys and those overlapping generic surveys were corrected as well as GA's bathy database. Completeness: All of GA's multibeam bathymetric data holding was used to produce the grids. Contact information
Metadata informationMetadata date: 2013-03-08 Additional metadataMetadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703015735.html Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703015735.xml . Authors:Spinoccia, M. |
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