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Capel and Faust Basins Marine Gravity Data

Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. These line dataset from the GA302 Capel and Faust Basins MSS survey were acquired in 2006 for Geoscience Australia. This survey acquired a range of pre-competitive geological and geophysical data that included seismic reflection, gravity, magnetic and swath bathymetry measurements, as well as seafloor dredge samples.

Simple

Identification info

Date (Creation)
2020-07-06
Date (Publication)
2020-07-14T05:30:44
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/140140

Identifier

Codespace

Digital Obejct Identifier

Status
Required
Point of contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice
Point of contact

Poudjom Djomani, Y.

Spatial representation type
Topic category
  • Geoscientific information

Extent

N
S
E
W


Temporal extent

Time period
2006-11-10 2006-12-20
Maintenance and update frequency
As needed

Resource format

Title

Product data repository: Various Formats

Website

Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

theme.ANZRC Fields of Research.rdf
  • GEOPHYSICS

  • EARTH SCIENCES

  • Marine Geoscience

  • Gravimetrics

ANZLIC Geographic Extent Name Register
  • CAPEL

Theme
  • gravity

Platform
  • marine

Place
  • Capel and Faust

Platform
  • shipborne

Feature type
  • vector

Feature type
  • line

Platform
  • offshore

Keywords
  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

Voice
OnLine resource

Download the data [36.2 MB]

Download the data [36.2 MB]

Distribution format
  • nc

Resource lineage

Statement

This data is a shipborne-derived gravity line dataset for the GA302 Capel and Faust Basins MSS seismic survey. The data was acquired for Geoscience Australia in 2006 under the project No. GA302. This survey acquired a range of pre-competitive geological and geophysical data that included seismic reflection, gravity, magnetic and swath bathymetry measurements, as well as seafloor dredge samples.

Levelling is a key step in processing shipborne gravity data. This process minimises the mistie errors at ship-track cross-overs that arise from factors such as positioning errors and instrument drift to gravity data. Without accounting for these cross-over errors, gridded data can be rendered un-interpretable by artefacts and distortions at line cross-overs. The processing steps applied to this GA-302 gravity line dataset include: 1) re-computation of free-air gravity anomalies to ensure consistent computation of gravity anomalies between the different datasets; 2) splitting ship-tracks into relatively straight line segments to avoid multiple cross-overs between any pair of lines; 3) line filtering of the previously-levelled Australia-wide dataset to reduce noise and improve cross-over computations; 4) merge the individual datasets into a single master dataset for levelling; 5) editing to remove lines or line segments with spurious data - lines that were too short or too close to other line segments were also removed in order to improve levelling results; 6) line levelling - gravity data were levelled using a polynomial levelling technique referenced to a satellite radar altimetry-derived dataset, magnetic data were loop levelled (minmising misclosures around closed loops formed by ship tracks); 7) computation of simple Bouguer gravity anomalies (ie. without terrain corrections) using a spherical-cap Bouguer correction and a density contrast between water and sediment of 970 kilograms per cubic metre and water depths interpolated at each data point from the 2009 Bathymetry and Topography Grid of Australia. The data processing and levelling were conducted using the INTREPID software from Intrepid Geophysics. The processed data was checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). This Index is also available online at http://pid.geoscience.gov.au/dataset/79134. Further up to date information about individual surveys can also be obtained online from the Airborne Surveys Database at http://www.ga.gov.au/oracle/argus/.

References: Intrepid Geophysics, http://www.intrepid-geophysics.com; Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).

Metadata constraints

Title

Australian Government Security Classification System

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/148f7691-61d3-45bb-8b6a-aed922917233

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice
Point of contact

Poudjom Djomani, Y.

Type of resource

Resource scope
Dataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/140140

Metadata linkage

https://ecat.ga.gov.au:80/geonetwork/srv/eng/catalog.search#/metadata/148f7691-61d3-45bb-8b6a-aed922917233

Metadata linkage

https://ecat.ga.gov.au:80/geonetwork/accessDenied.jsp/eng/catalog.search#/metadata/148f7691-61d3-45bb-8b6a-aed922917233

Metadata linkage

https://ecat.ga.gov.au:80/geonetwork/static/eng/catalog.search#/metadata/148f7691-61d3-45bb-8b6a-aed922917233

Date info (Creation)
2020-07-06T05:07:23
Date info (Revision)
2020-07-06T05:07:23

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/140140

 
 

Spatial extent

N
S
E
W


Keywords

gravity line marine offshore shipborne vector
theme.ANZRC Fields of Research.rdf
EARTH SCIENCES GEOPHYSICS Gravimetrics Marine Geoscience

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