Lindsay-Wallpolla and Lake Victoria-Darling Anabranch GIS; River Murray Corridor Salinity Mapping and Interpretation Project
Dataset Identification:
Resource Abstract:
This GIS data package contains airborne electromagnetic (AEM) datasets and interpreted data products for the Lindsay-Wallpolla
and Lake Victoria-Darling Anabranch survey area, as part of the River Murray Corridor (RMC) Salinity Mapping and Interpretation
Project. The RMC project was undertaken between 2006 and 2010 to provide information on a range of salinity and land management
issues along a 450 kilometre reach of the Murray River from the South Australian border to Gunbower, northwest of Echuca in
Victoria. The Lindsay-Wallpolla survey area extends from the South Australian border to approximately 10 kilometres west of
Mildura, incorporating Lake Victoria and the lower reaches of the Darling and Darling Anabranch river systems. 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 main components in the package are: AEM data and images
derived from a holistic inversion of the RMC RESOLVE AEM survey; a composite digital elevation model (DEM); a range of interpreted
data products designed to map key elements of the hydrogeological system and salinity hazard; and a series of ESRI ArcGIS
map documents. The AEM data component consists of grids and images of modelled conductivity data derived from a holistic inversion
of the RMC RESOLVE AEM survey. They include: layer conductivity grids below ground surface; depth slice grids representing
the average conductivity of various regular depth intervals below ground surface; floodplain slice grids representing the
average conductivity of various depth intervals relative to the elevation above or below a surface that approximates the River
Murray floodplain; watertable slice grids representing the average conductivity of various intervals relative to the elevation
above or below the regional watertable; and AEM cross sections of conductivity versus depth along each of the flight lines.
The holistic inversion AEM data are derived from the 'River Murray Corridor RESOLVE AEM Survey, VIC & NSW, 2007 Final Data
(P1141)', available as GA product (GeoCat #67212).The DEM data component consists of a 10 metre resolution composite DEM for
the River Murray Corridor AEM Survey area, derived from airborne light detection and ranging (LiDAR) surveys, AEM surveys
and the shuttle radar topography mission (SRTM) survey. The interpreted data component is organised into product themes to
address salinity and land management questions and to map key elements of the hydrogeological system and salinity hazards.
An ArcGIS map document is included for each product theme. The products include: Blanchetown Clay; conductive soils; flush
zones; groundwater conductivity; strategic extents and reliability; near surface conductive zones; near surface resistive
zones; Parilla Sands; Quaternary alluvium; recharge; salt store; surface salt; vegetation health; and Woorinen Formation.
The RMC project was funded through the National Action Plan for Salinity and Water Quality, with additional funding from the
Lower Murray Catchment Management Authority (CMA), Mallee CMA, Goulburn-Murray Water and the Murray-Darling Basin Authority.
The project was administered by the Australian Government Department of Agriculture, Fisheries and Forestry through the Bureau
of Rural Sciences, now known as the Australian Bureau of Agricultural and Resource Economics and Sciences (ABARES). Geoscience
Australia (GA) were contracted to provide geophysical services to manage the AEM system selection and data acquisition, and
to process and calibrate the AEM data. The AEM survey was flown by Fugro Airborne Geophysical Services in 2007 using the helicopter-borne
RESOLVE frequency domain system. The Cooperative Research Centre for Landscape Environments and Mineral Exploration was sub-contracted
through GA to manage the interpretation and reporting component of the RMC project.
Citation
Title Lindsay-Wallpolla and Lake Victoria-Darling Anabranch GIS; River Murray Corridor Salinity Mapping and Interpretation Project
AEM dataThe holistic inversion methodology used to generate the conductivity model data is described in Brodie and Sambridge
(2006). Information on how the layer conductivity grids, depth slice grids, floodplain slice grids and watertable slice grids
were derived is included in Appendix 1 of the user guide for this data package. The AEM survey data were acquired and processed
by the airborne geophysical survey contractor, Fugro Airborne Surveys. Details of the acquisition and processing are described
in Farquhar (2008) and available from ABARES publications. DEM dataThe merging of elevation datasets for the River Murray
Corridor AEM project was undertaken by Geoscience Australia. The data compilation is described in Brodie (2008) and is available
from ABARES publications. Interpreted data productsThe methods used to compile and customise products to address salinity
and land management questions are described in Tan et al 2009. Tan et al (2009) is included in this data package and is also
available from ABARES publications. Additional metadata for some products are included in this data package, as described
in the user guide.
Metadata standard for this record:
ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
standard version:
1.1
Metadata record identifier:
a05f7892-eabf-7506-e044-00144fdd4fa6
URI for dataset described:
> http://www.ga.gov.au/metadata-gateway/metadata/record/68772/
Metadata record format is ISO19139-2 XML (MI_Metadata)