Bass Basin GIS project : an output of the Western Tasmanian Regional Minerals Program- navigation

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: ANZCW0703004681

Title: Bass Basin GIS project : an output of the Western Tasmanian Regional Minerals Program- navigation

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Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia

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The navigation data comprises of clipped seismic navigation (three surveys which have been reprocessed) from Deep Seismic Marine Data Navigation Tracks from RV Rig Seismic {National Geoscience Dataset}, and a selection of industry derived seismic over the bass basin. The datasets are as follows:-

ga_reprocessed_line.shp, ga_reprocessed_shot.shp

Reprocessed seismic of AGSO Survey 040, AGSO Survey 082, AGSO Survey 090

* industry_line.shp

Seismic navigation only, shot by industry and obtained from state governments

*sniffer_089_lines.shp & sniffer_089_points.shp

The 'Sniffer' or Direct Hydrocarbon Detection (DHD) technique used to detect hydrocarbon seepage offshore involves towing a submerged tow-fish close to the seafloor and continuously pumping seawater into a geochemical laboratory on board where the hydrocarbons are extracted and measured by gas chromatography. The Direct Hydrocarbon Detection (DHD) method continuously analyses C1-C8 hydrocarbons within seawater.

ANZLIC search words:

GEOSCIENCES Research
GEOSCIENCES Geology Mapping
GEOSCIENCES Geophysics Surveys

Spatial domain:

locality map

Geographic extent name: BASS STRAIT - BASS STRAIT - Ocean and Sea Regions - Australia

Geographic extent polygon: 143 -37, 149 -37, 149 -43, 143 -43, 143 -37,

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

Geographic bounding box:: North bounding latitude: -37 °; South bounding latitude: -43 °; East bounding longitude: 149 °; West bounding longitude: 143 °

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Data currency

Beginning date: 2002-02-10

Ending date: 2002-06-10

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Dataset status

Progress: Complete

Maintenance and update frequency: Not Known

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Access

Stored data format:: DIGITAL - shp ArcView shape file ArcView Geographic WGS84

Available format type:: DIGITAL - shp ArcView shape file ArcView Geographic WGS84

Access constraints:

Contact the Senior Project Scientist to discuss user requirements and costs

Free Data Download

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Data quality

Lineage:

ga_reprocessed_line.shp, ga_reprocessed_shot.shp

Extract of every 500th shotpoint from original Petrosys Database. This extracted ASCII file is used to generate a line coverage in ArcInfo, and attribute it with the survey information.

industry_line.shp

Data was supplied as navigation only (no shotpoints) in ArcView format (shape files).

sniffer_089_lines.shp and sniffer_089_points.shp

Data was supplied as Excel files originally. They were then converted to dbf files for easier access in Arc shape files. A common subset of the parameters used by GA for seepage studies was extracted for each of these types of surveys.

Positional accuracy:

ga_reprocessed_line.shp, ga_reprocessed_shot.shp

Nominal Scale 1:10,000

industry_line.shp

Nominal Scale 1:100,000

sniffer_089_lines.shp and sniffer_089_points.shp

Nominal Scale 1:10,000

Attribute accuracy:

ga_reprocessed_line.shp, ga_reprocessed_shot.shp

High, only one attribute is extracted directly from a database.

industry_line.shp

High, the "name" attribute matches actually survey names.

sniffer_089_lines.shp & sniffer_089_points.shp

All attributes came from the original Excel files that were made when the survey was taking place. No changes were made. More information can be found at GeoCAT 34452.

Logical Consistency:

ga_reprocessed_line.shp, ga_reprocessed_shot.shp

A geoscientist visually inspected the finished dataset to make sure the attributes were accurate and the data were consistent spatially with current scientific information. Tests are also carried out on these data for data completeness, correct spatial representation, attribute accuracy, logical consistency and correctness, and where appropriate for compliance with Geoscience Australia's GIS data dictionary available at "http://www.agso.gov.au/general/technotes/20011112_53.jsp"

industry_line.shp

A geoscientist visually inspected the supplied dataset to make sure the attributes were accurate and the data were consistent spatially with current scientific information.

Completeness:

ga_reprocessed_line.shp, ga_reprocessed_shot.shp

The dataset coverage is complete for marine areas of the Australian Jurisdictional Area.

industry_line.shp

The dataset is complete, lines were checked visually for navigational and survey name errors.

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