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Layered earth inversion and related airborne geophysical datasets derived from the Lower Macquarie River TEMPEST AEM Survey, New South Wales, 2007.

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: ANZCW0703016055

Title: Layered earth inversion and related airborne geophysical datasets derived from the Lower Macquarie River TEMPEST AEM Survey, New South Wales, 2007.


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

This data package contains three airborne geophysical datasets that have been acquired and processed from the Lower Macquarie River TEMPEST AEM survey flown in 2007, located to the north-west of Dubbo in the Central West region of New South Wales. The datasets are: a new Geoscience Australia layered earth inversion (GA-LEI) of the 2007 Lower Macquarie River TEMPEST Airborne Electromagnetic (AEM) survey; an airborne magnetic survey; and a digital elevation model (DEM). These data include enhancements of previously available datasets using more recent geophysical processing software advances.

This metadata briefly describes the contents of the data package. The user guide included in the package contains more detailed information about the individual datasets and available technical reports.

The AEM dataset comprises the final Geoscience Australia layered earth inversion (GA-LEI) of the Lower Macquarie River TEMPEST AEM survey data, produced in 2008. The main data products from the GA-LEI inversion are: point located inversion output data; horizontal layer conductivity grids below ground surface; horizontal conductivity-depth slice grids of various regular depth intervals below ground surface; vertical conductivity-depth sections along each flight line; AEM survey outline and flight line vector GIS data; and borehole comparison logs. The GA-LEI AEM data are derived from the 'Lower Macquarie River TEMPEST AEM Survey, NSW, 2007 Final Data (P1140)', available as Geoscience Australia product number 67211 (GeoCat #67211). The GA-LEI has been demonstrated to generate more accurate conductivity predictions than other algorithms for similar TEMPEST surveys.

The airborne magnetics and DEM data in this data package includes the corresponding data from GeoCat #67211, with additional raster and image formats to facilitate accessibility on a range of geographic information system platforms.

The point located data are stored in ASCII files (.asc) formatted with space-delimited columns with an associated comprehensive header (.hdr) file. The gridded data are stored in ER Mapper and ESRI grid formats as binary floating point raster grid files. The image data are stored in GeoTIFF format with associated world (.tfw) files and (.png) legends. The vector data are stored in ESRI shapefiles (.shp) Technical reports are stored in Portable Document Format (.pdf). The datasets are compressed in ZIP files.

The TEMPEST time domain airborne electromagnetic (AEM) survey was flown by Fugro Airborne Surveys over the Lower Macquarie River catchment in 2007. The survey was commissioned by the Australian Government Department of Agriculture, Fisheries and Forestry through the Bureau of Rural Sciences (BRS), now known as the Australian Bureau of Agricultural and Resource Economics and Sciences (ABARES) and funded under the National Action Plan for Salinity and Water Quality. Geoscience Australia (GA) provided several geophysical services in relation to the survey including survey planning, technical system selection, data quality control and layer earth inversion of the resultant data. Format conversion of the magnetics and DEM data in this product was performed by ABARES from data provided by GA.

ANZLIC search words:

  • GEOSCIENCES Geophysics Surveys

Spatial domain:

locality map

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

Geographic extent polygon: 146.99 -30.39, 148.48 -30.39, 148.48 -32.43, 146.99 -32.43, 146.99 -30.39,

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

Geographic bounding box:
North bounding latitude: -30.39 °
South bounding latitude: -32.43 °
East bounding longitude: 148.48 °
West bounding longitude: 146.99 °

Data currency

Beginning date: 2007-01-17

Ending date: 2007-04-13


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - pdf Adobe PDF Acrobat
DIGITAL - ArcGIS-grid ArcInfo grid GDA94
DIGITAL - tif Tagged Image File Format (TIFF) - including GeoTIFF GDA94
DIGITAL - png Portable Network Graphics (PNG)
DIGITAL - shp ArcView shape file ArcView GDA94
DIGITAL - ascii ASCII text GDA94
DIGITAL - jpg JPEG image GDA94
DIGITAL - ers ER Mapper raster dataset ER Mapper GDA94
Available format type:
DIGITAL - pdf Adobe PDF Acrobat GDA94
DIGITAL - shp ArcView shape file ArcView GDA94
DIGITAL - ascii ASCII text GDA94
DIGITAL - ArcGIS-grid ArcInfo grid GDA94
DIGITAL - png Portable Network Graphics (PNG) GDA94
DIGITAL - ers ER Mapper raster dataset ER Mapper GDA94
DIGITAL - jpg JPEG image
DIGITAL - tif Tagged Image File Format (TIFF) - including GeoTIFF

Access constraints:

This material is released under the Creative Commons Attribution 3.0 Australia Licence.

Free Data Download

Data quality

Lineage:

The processing of the TEMPEST AEM conductivity predictions using the GA-LEI algorithm was undertaken by Geoscience Australia. Details of the processing are available in Brodie and Fisher (2008), which is included in the dataset (Filename: LMR_GA_AEMInversionReport.pdf).

The AEM survey data, magnetics data and DEM were acquired and processed by the airborne geophysical survey contractors Fugro Airborne Surveys. Details of the survey operations are provided in Noteboom and Stenning (2008), which is included in the dataset (Filename: LMR_Fugro_AEMAcquisitionReport.pdf).

Positional accuracy:

Positioning was via post-processed differential GPS methods. Horizontal positional accuracy of the data is approximately 1 metre (standard deviation).

Attribute accuracy:

The data have been acquired and processed to a standard of best practice as of the year 2008. More sophisticated processing algorithms may be applied to these data should they become available.

Logical Consistency:

Not applicable.

Completeness:

The dataset includes all final data and products created by Geoscience Australia for the project.


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/ANZCW0703016055.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703016055.xml

Brodie, RC & Fisher, A 2008. Inversion of TEMPEST AEM survey data Lower Macquarie River, New South Wales, Geoscience Australia, Canberra, Australia.

Noteboom, M & Stenning, L 2008, Lower Macquarie River airborne electromagnetic mapping survey acquisition and processing report, Fugro Airborne Surveys report to the Bureau of Rural Sciences.

Authors:Geoscience Australia
SPATIAL INFORMATION FOR THE NATION