GSWA Merredin Bruce Rock South thorium grid geodetic  


Authors / CoAuthors

Geophysical Acquisition & Processing Section

Abstract

This GSWA Merredin Bruce Rock South thorium grid geodetic is an airborne-derived radiometric thorium window countrate grid for the Merredin-Bruce Rock, WA, 1997 survey. The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of thorium (K), uranium (U) and thorium (Th). 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. This GSWA Merredin Bruce Rock South thorium grid geodetic has a cell size of 0.00038 degrees (approximately 39m). The data are in units of counts per second (or cps). The data used to produce this grid was acquired in 1997 by the WA Government, and consisted of 27533 line-kilometres of data at 150m line spacing and 50m terrain clearance.

Product Type

dataset

eCat Id

142362

Contact for the resource

  Point of contact

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Keywords

theme.ANZRC Fields of Research.rdf
  • EARTH SCIENCES
( Data centre )
  • NCI
( Discipline )
  • Earth sciences
( Discipline )
  • geophysics
( Feature type )
  • grid
( Place )
  • Australia
( Place )
  • WA
( Project )
  • survey 1064
( Theme )
  • GADDS2.0
( Theme )
  • radiometrics
( Theme )
  • NASVD
( Theme )
  • thorium
( Theme )
  • window countrate
( Theme )
  • airborne digital data
( Theme )
  • geophysical survey
( Theme )
  • rad
( Theme )
  • Th
( Theme )
  • gamma-ray
( Theme )
  • spectrometry
( Theme )
  • grid
( Theme )
  • raster
  • Published_External

Publication Date

2020-03-07T00:00:00

Creation Date

2020-03-07T00:00:00

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

completed

Purpose

Maintenance Information

notPlanned

Topic Category

geoscientificInformation

Series Information

Lineage

This GSWA Merredin Bruce Rock South thorium grid geodetic is an airborne-derived radiometric thorium window countrate grid for the Merredin-Bruce Rock, WA, 1997 survey. The survey was acquired in 1997 under the project No. 1064 for the geological survey of WA. The data consisted of 27533 line-kilometres of data at 150m line spacing and 50m terrain clearance. The radiometric count rate is contaminated by background radiation contributions from the aircraft, cosmic rays, and the presence of Radon gas escaping from the ground. It is also affected by the ground clearance of the detector, as well as the volume of the detector. This grid was produced after applying radiometric corrections to the thorium window data from the survey. The final grid is checked for quality by GA geophysicists to ensure that the final data released are fit-for-purpose. This GSWA Merredin Bruce Rock South thorium grid geodetic has a cell size of 0.00038 degrees (approximately 39m) and shows the thorium window countrate of the Merredin-Bruce Rock, WA, 1997 survey in units of counts per second (or cps). Noise-adjusted singular value decomposition (NASVD) has been applied to the data. NASVD is a spectral component analysis procedure for the removal of noise from gamma-ray spectra. 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. References Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).

Parent Information

Geophysical Data Collection - Airborne Geophysics

UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,

eCat ID - 111301

Extents

[-32.0097, -31.4918, 117.7405, 118.2793]

Reference System

GDA94 (EPSG:4283)

Spatial Resolution

Service Information

Associations

Association Type - operatedOnBy

GSWA Merredin Bruce Rock South thorium grid geodetic NCSS    

Association Type - operatedOnBy

GSWA Merredin Bruce Rock South thorium grid geodetic OPeNDAP    

Association Type - operatedOnBy

GSWA Merredin Bruce Rock South thorium grid geodetic WMS    

Association Type - operatedOnBy

GSWA Merredin Bruce Rock South thorium grid geodetic WCS    

Downloads and Links

File available for download in various formats from the GADDS2 portal  

GSWA Merredin Bruce Rock South thorium grid geodetic file download  

GSWA Merredin Bruce Rock South thorium grid geodetic NCSS  

GSWA Merredin Bruce Rock South thorium grid geodetic OPeNDAP  

GSWA Merredin Bruce Rock South thorium grid geodetic WMS  

GSWA Merredin Bruce Rock South thorium grid geodetic WCS  

Source Information

This GSWA Merredin Bruce Rock South thorium grid geodetic includes airborne-derived radiometric Thorium window count radiometric data for the Merredin-Bruce Rock, WA, 1997 survey acquired for the geological survey of WA