NSW government geophysics - data package

All NSW government geophysical data is available on a single portable hard drive costing $110 (Ordering information). Version 2 is available now. The data has been acquired by the NSW Government and Geoscience Australia under various funding initiatives. Included is data from:

  • Airborne magnetic, radioelement and elevation surveys
  • Ground gravity surveys
  • Airborne gravity surveys
  • Airborne electromagnetic surveys
  • Airborne hyperspectral surveys, and
  • State-wide geophysical merges

Located data for each project area is provided in five different formats (ascii text, BIL files, ASEG GDF and ASEG GDF2). Grids of each project area and the state-wide merges are provided as ER Mapper grids (ERDAS®), and images are provided in ECW, TIFF, or JPEG formats.  Where available, supporting documents like acquisition reports, metadata and ESRI® shapefiles are included. Older surveys are less likely to have supporting documentation.

Airborne magnetic, radioelement and elevation surveys

The NSW Government has been acquiring airborne magnetic, radioelement and Digital Elevation Model (DEM) data since 1991, under various NSW Government funding initiatives and in collaboration with Geoscience Australia. Surveys were also acquired over some coal basins. About 88% of NSW has been surveyed at 400 m line spacing or closer.

Data from 59 regional airborne surveys are included on the NSW Government geophysics data package hard drive and can be ordered by emailing geophysics.products@geoscience.nsw.gov.au. You can also download all NSW Government airborne survey located, grid and image data for free through MinView or, alternatively the Geoscience Australia Geophysical Archive Data Delivery System (GADDS).

Airborne magnetic, radioelement and DEM survey areas

Ground gravity surveys

The NSW Government is acquiring ground gravity readings across NSW, with about 73% of the state covered with 4x4 km or closer readings. The hard drive includes 29 gravity surveys.

Ground gravity data from across NSW can be downloaded for free through the Geoscience Australia Geophysical Archive Data Delivery System (GADDS).

Location of ground gravity surveys

Airborne gravity surveys

Government-funded airborne gravity surveys have been completed over the Broken Hill area. Data from these surveys are included on the NSW Government geophysics data package hard drive and can be ordered by emailing geophysics.products@geoscience.nsw.gov.au. Survey boundaries can be viewed in MinView and data can be requested by emailing geophysics.products@geoscience.nsw.gov.au.

Location of government funded airborne gravity surveys

Airborne electromagnetic surveys

AEM data was acquired in northwestern NSW by the Department of Planning & Environment. Data from these surveys are included on the NSW Government geophysics data package hard drive and can be ordered by emailing geophysics.products@geoscience.nsw.gov.au. Survey boundaries can be viewed in MinView and data can be requested by emailing geophysics.products@geoscience.nsw.gov.au.

Location of AEM surveys

Hyperspectral data

Hyperspectral data has been acquired around Broken Hill.

Location of hyperspectral surveys

State-wide geophysics

Individual regional airborne and ground gravity survey grids have been merged together to produce state-wide grids for the following data types:

  • Airborne magnetics (50 m grid cell size)
  • Airborne radioelements (100 m grid cell size)
  • Airborne DEM (50 m grid cell size)
  • Ground gravity (500 m grid cell size)

These filters and enhancements were applied to produce the following state-wide grids:

  • Total magnetic intensity (TMI)
  • 1st vertical derivative TMI (1VD TMI)
  • 2nd vertical derivative TMI (2VD TMI)
  • TMI reduced to the pole (TMI RTP)
  • 1VD TMI RTP
  • TMI RTP tilt-filtered
  • Potassium %
  • Thorium ppm
  • Uranium ppm
  • Digital elevation model
  • Spherical-Cap Bouguer gravity
  • Isostatic gravity

These grids were used to generate images presented in pseudocolour, greyscale or ternary colour schemes. Imagery is available for viewing and download through MinView in ECW, GeoTIFF and JPEG formats for the following data types and enhancements:

  • TMI RTP
  • 1VD TMI RTP
  • TMI RTP tilt-filtered
  • TMI RTP over TMI RTP tilt-filtered
  • Composite ternary image of potassium, thorium & uranium
  • Elevation
  • Bouguer gravity
  • Isostatic Bouguer gravity
  • Isostatic Bouguer gravity over TMI RTP tilt-filtered

The state-wide geophysical images can be viewed in MinView, where they can also be clipped to areas of interest and downloaded for free.

State-wide geophysical maps

Hardcopy flat or folded maps of geophysical imagery over NSW at 1:1 500 000 are available for $19.80.

1:250 000 geophysical imagery suites

Suites of geophysical imagery (with metadata) have been generated for each 1:250 000 map sheet area in NSW. They show the best resolution imagery available, with colour stretches optimised to enhance subtle features in state-wide imagery. Download these image suites for free through MinView.

Each suite contains about 20 images, totalling around 3Gb. Images are projected in both GDA94 (latitude, longitude) and MGA zone. They can be downloaded in three georeferenced image formats (JPEG, ECW and TIFF). Geophysical imagery for each map sheet comprises:

  • Aeromagnetic data : TMI, TMI RTP, 1VD TMI, 1VD TMI RTP, 2VD TMI, greyscale TMI, greyscale TMI RTP tilt-filter and TMI RTP over TMI RTP tilt-filter
  • Gravity data : Bouguer gravity, isostatic Bouguer gravity, greyscale isostatic Bouguer gravity tilt-filter, isostatic Bouguer gravity over TMI RTP tilt-filter, and isostatic Bouguer gravity over isostatic Bouguer gravity tilt-filter
  • Radiometric data : Ternary K/U/Th, potassium (%) band-pass filtered over SRTM DEM, thorium (ppm) band-pass filtered over SRTM DEM and uranium (ppm) band-pass filtered over SRTM DEM
  • Additional : DEM, Landsat-7 principle components 1, 2 & 3

Open file company geophysical surveys

Exploration companies must submit geophysical data that they have acquired to the NSW Government to comply with exploration title reporting requirements. Surveys by exploration companies commonly are higher resolution than government-funded regional surveys. Submitted geophysical surveys are indexed in the GSNSW Aerofind database, which contains location and metadata for about 1000 airborne surveys done by exploration companies in NSW. Aerofind is publicly accessible through MinView. Use the Minerals View and select the Company Geophysics layers. Then use the Spatial Search tool to determine ID of the survey you are interested in. Cut and paste search results to geophysics.products@geoscience.nsw.gov.au. Our staff will check the confidentiality status of the survey and if open file,  provide the data via Google Drive, FTP transfer or digital media.

Distribution and types of company geophysical surveys archived in Aerofind

Seismic surveys

Seismic surveys support the study of the stratigraphy and major structural and tectonic features of the basement rocks. To locate seismic line data use MinView. Click a Seismic Line to determine the Survey ID (Name) and then request via email: geoscience.petroleum@geoscience.nsw.gov.au.

Seismic surveys of onshore and offshore NSW, colour coded by the decade of acquisition

For further information
Geophysics Products
Phone:
+61 (0)2 4063 6639
geophysics.products@geoscience.nsw.gov.au
Postal:
Geophysics Products, Geological Survey of New South Wales, PO Box 344, Hunter Region Mail Centre NSW 2310
Office:
516 High Street Maitland NSW 2320 Map