Revision of the Kerguelen Plateau bathymetric grid

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

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Dataset citation

ANZLIC unique identifier: ANZCW0703014635

Title: Revision of the Kerguelen Plateau bathymetric grid

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Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia

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This data replaces the digital elevation model (DEM) for the Kerguelen Plateau region produced in 2005 (Sexton 2005). The 2010 version has been gridded at a grid pixel resolution of 0.001-arc degree (about 100 m). The new grid utilised the latest data sourced from ship-based multibeam and singlebeam echosounder surveys, and satellite remotely-sensed data.

Report Reference: Beaman, R.J. and O'Brien, P.E., 2011. Kerguelen Plateau bathymetric

grid, November 2010. Geoscience Australia, Record, 2011/22, 18 pages.

ANZLIC search words:

GEOSCIENCES Geomorphology
MARINE Geology and Geophysics

Spatial domain:

locality map

Geographic extent name: AUSTRALIA INCLUDING EXTERNAL TERRITORIES - AUSAAT - Australia - Australia

Geographic extent polygon: 68 -48, 80 -48, 80 -56, 68 -56, 68 -48,

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

Geographic bounding box:: North bounding latitude: -48 °; South bounding latitude: -56 °; East bounding longitude: 80 °; West bounding longitude: 68 °

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Data currency

Beginning date: 2008-02-01

Ending date: Not Known

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Dataset status

Progress: Complete

Maintenance and update frequency: Not Known

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Access

Stored data format:: DIGITAL - ArcGIS-grid ArcInfo grid WGS84

Available format type:: DIGITAL - ArcGIS-grid ArcInfo grid WGS84

Access constraints:

Unclassified

Free Data Download

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Data quality

Lineage:

Refer to report: Kerguelen Plateau Bathymetric Grid, November 2010. Geoscience Australia Record 2011/022.

Positional accuracy:

The source bathymetric data vertical and horizontal accuracies were classified according to the International Hydrographic Organization Standards for Hydrographic Surveys Special Publication 44 (IHO 2008). Source bathymetry data can be classified into four categories of uncertainty: Special Order, Order 1a, Order 1b and Order 2. Table 1 in IHO (2008) sets out the minimum standards for hydrographic surveys, together with a formula to calculate the maximum allowable Total Horizontal Uncertainty (THU) and Total Vertical Uncertainty (TVU) for each category of uncertainty. For this project, the multibeam datasets conform to the Order 1b category, and the singlebeam datasets conform to the Order 2 category. The kerg_dem grid generally conforms to an Order 2 Total Horizontal Accuracy (THU) and Total Vertical Accuracy (TVU), based upon the worse case uncertainty category of Order 2. Both THU and TVU increase according to depth, so the maximum allowable THU is: 30 m up to 100 m depth; 70 m up to 500 m depth; 120 m up to 1000 m depth; 220 m up to 2000 m depth, and so on. Realistically, the accuracy of GPS used for positioning during modern surveys is far better than the maximum allowable THU for Order 2 surveys, and so the THU figures quoted here are conservative. The maximum allowable TVU for Order 2 surveys is: 2.5 m up to 100 m depth; 11.5 m up to 500 m depth; 23 m up to 1000 m depth; and 46 m up to 2000 m depth, and so on.

Attribute accuracy:

Not known

Logical Consistency:

Not known

Completeness:

Dataset complete, but updated as required.

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