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XYZ single and multibeam bathymetry grids for the WA Margins

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.


Dataset citation

ANZLIC unique identifier: ANZCW0703015595

Title: XYZ single and multibeam bathymetry grids for the WA Margins


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

This is a compilation of all the processed single beam and multibeam data that are publicly released and that Geoscience Australia holds in its database for the WA Margins within the following area: Latitude -26 to -31South and Longitude 111 to 115.5 East.

The data was acquired by 9 multibeam research veseels:

N/O L'Atalante, RV. Marion Dufresne, R.V.Southern Surveyor, R.V.Sonne, R.V. Maurice Ewing, R.V. Solander, R.V. Melville, R.V. Mirai and R.V. Hakuho Maru.

The WA Margins was devided into two grids:

a- WAMargins1 and extends from Longitude 111? to 114? East and Latitude -26? to -31? South WGS UTM 49

b- WAMargins2 and extends from Longitude 114? to 115.5? East and Latitude -26? to -31? South WGS UTM50

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-49S.and WGS84-50S

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 grid soundings or false colored images for presentation and reporting and as final processed data in GSF (Generic Sensor Format) format that can be read by any non Caris user. The data was also exported as ASCII XYZ file format with header information exported as (Easting, Northing and negative depth) in Universal transverse Mercator UTM projection (UTM 49S for WAMargin1 grid and UTM50S for WAMargins 2 grid) and WGS84 (World Geodetic System 1984) Datum.

A total of 732,497.86 sail Km and 88,779.59 km2 of swath data were discovered in Geoscience Australia's data holding, that produced the following:

1- XYZ ASCII grid for WA Margins1, 90m resolution projected in Easting and Northing UTM49, WGS84.

2- XYZ ASCII grid for WA Margins2, 90m resolution projected in Easting and Northing UTM50, WGS84.

3- ESRI arc info grid for WA Margins1, 90m resolution, projected in Easting and Northing UTM49, WGS84.

4- ESRI arc info grid for WA Margins2, 90m resolution, projected in Easting and Northing UTM50, WGS84.

5- Georeferenced colour tif images shaded with sun azimuth 45 degrees for WA Margins1, 90m resolution.

6- Georeferenced colour tif images shaded with sun azimuth 45 degrees for WA Margins2, 90m resolution.

7- Geotif of the entire area with a depth legend to go with the images.

ANZLIC search words:

  • GEOSCIENCES Mapping
  • GEOSCIENCES Geomorphology Mapping
  • MARINE Biodiversity

Spatial domain:

locality map

Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia

Geographic extent polygon: 111 -26, 115.5 -26, 115.5 -31, 111 -31, 111 -26,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:
North bounding latitude: -26 °
South bounding latitude: -31 °
East bounding longitude: 115.5 °
West bounding longitude: 111 °

Data currency

Beginning date: 1994-04-10

Ending date: 2011-01-11


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - ArcGIS-grid ArcInfo grid Universal Transverse Mercator (UTM) WGS84
DIGITAL - tif Tagged Image File Format (TIFF) - including GeoTIFF Universal Transverse Mercator (UTM) WGS84
DIGITAL - comma_delimited Ascii file Universal Transverse Mercator (UTM) WGS84
Available format type:
DIGITAL - comma_delimited Ascii file Universal Transverse Mercator (UTM) WGS84
DIGITAL - ArcGIS-grid ArcInfo grid Universal Transverse Mercator (UTM) WGS84
DIGITAL - tif Tagged Image File Format (TIFF) - including GeoTIFF Universal Transverse Mercator (UTM) WGS84

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 Download

Data quality

Lineage:

The data was acquired onboard nine research vessels through nineteen surveys as following:

# Survey Name Vessel Name Multibeam System Institution Start Date End Date Start Port End Port

1 GA-0157_Adedav N/O L'Atalante EM120D (12 kHz) EM950 (95kHz) GA/IFREMER 10/04/1994 11/04/1994 Adelaide SW Timor

2 GA-0235_EW0113 RV M. Ewing Atlas hydrosweep DS (14-16 kHz) LDEO 30/10/2001 30/11/2001 Fremantle Fremantle

3 GA-0296_SS072005 RV S.Surveyor EM300 (30 kHz) CSIRO 28/07/2005 2/08/2005 Dampier Fremantle

4 GA-0307_SOL4769 RV Solander EM3002D (300 kHz) GA/AIMS 7/08/2008 8/08/2008 Fremantle Exmouth

5 GA-0332_SS052011 RV S.Surveyor EM300 (30 kHz) GA 21/09/2011 17/10/2011 Geraldton Geraldton

6 GA-1431_SOJN04MV RV Melville Seabeam 2000 SIO 12/02/1997 13/02/1997 Capetown Fremantle

7 GA-2367_EW0112 M.Ewing Atlas hydrosweep DS (14-16 kHz) LDEO 21/10/2001 21/10/2001 Seychelles Fremantle

8 GA-2390_SS102005 RV S.Surveyor EM300 (30 kHz) CSIRO 17/11/2005 14/12/2005 Fremantle Dampier

9 GA-2406_SS052006 RV S.Surveyo EM300 (30 kHz) UWA 4/05/2006 27/05/2006 Fremantle Geraldton

10 GA-2408_SS06200 RV S.Surveyo EM300 (30 kHz) GA 29/05/2006 29/05/2006 Geraldton Pt Hedland

11 GA-2412_MR0401 RV Mirai Seabeam 2112 (12 kHz) JAMSTEC 22/02/2004 23/02/2004 Fremantle Yokohama

12 GA-2434_SS042007 RV S.Surveyor EM300 (30 kHz) CSIRO 21/05/2007 30/05/2007 Fremantle Dampier

13 GA-2468_MD119 RV Marion Dufresne TSM 5265 IPEV 27/09/2000 31/9/2000 Surabaya Fremantle

14 GA-2476_WAMargins RV Sonne EM120 (12 kHz) GA 30/10/2008 12/01/2009 Singapore Cigading Ind

15 GA-4304_SST012010 RV S.Surveyor EM300 (30 kHz) CSIRO 29/03/2010 13/04/2010 Hobart Broome

16 GA-4313_SS042010 RV S.Surveyor EM300 (30 kHz) CSIRO 24/05/2010 26/05/2010 Pt Hedland Fremantle

17 GA-4318_SS052010 RV S.Surveyor EM300 (30 kHz) CSIRO 7/07/2010 26/07/2010 Fremantle Fremantle

18 GA-4325_SS062010 RV S.Surveyor EM300 (30 kHz) CSIRO 29/07/2010 30/07/2010 Fremantle Fremantle

19 GA-4340_HK11-01 RV Hakuho Maru Seabeam 2120 (20 kHz) GA/Tokyo U. 21/01/2011 22/01/2011 Fremantle Darwin

Positional accuracy:

Visual assessment of the grids indicates that its logical consistency is good.

The RV Southern Surveyor useda DGPS and four antennae connected to GPS receiver with an accuracy of 2 to 3m.

Attribute accuracy:

High quality bathymetric data that form an aerial coverage exists. Overlapping swaths and speed of sound corrections show 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 single and multibeam surveys have utilized a nominal speed of sound of 1500m/s and are not so accurate.

Logical Consistency:

Visual assesment of the grids indicates that its logical consistency is good.

Each of the area input dataset was examined in detail and edited where necessary. WA Margins single and multibeam bathymetry was compiled from different intersected generic surveys and those overlapping generic surveys were connected as well as GA's bathymetric database.

Completeness:

All of GA's single and multibeam bathymetry data was used to produce these grids.


Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address: sales@ga.gov.au

Metadata information

Metadata date: 2013-03-08


Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703015595.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703015595.xml

.

Authors:Spinoccia, M.
SPATIAL INFORMATION FOR THE NATION