Authors / CoAuthors
Abstract
The filtered potassium grid is a derivative of the 2015 radiometric or gamma-ray grid of Australia. 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 potassium, uranium and thorium. The data are collected on airborne geophysical surveys conducted by Commonwealth, State and Northern Territory Governments and the private sector. The 2015 filtered potassium grid has a cell size of about 100m (0.001 degrees) and shows potassium element concentrations of the Australia region. It was obtained by applying a low-pass filter to the original potassium grid. Potassium is the seventh most abundant element in the Earth's crust. This potassium concentration grid can be used to locate minerals and compounds containing potassium. The original grid was converted from ERMapper (.ers) format to netCDF4_classic format using GDAL1.11.1. The main purpose of this conversion is to enable access to the data by relevant open source tools and software. The netCDF grid was created on 2016-03-29.
Product Type
dataset
eCat Id
89601
Contact for the resource
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Digital Object Identifier
Keywords
- ( Theme )
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- airborne digital data
- ( Theme )
-
- radiometrics
- ( Theme )
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- potassium
- ( Theme )
-
- national geophysical compilation
- ( Discipline )
-
- Earth sciences
- ( Discipline )
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- geophysics
- ( Data centre )
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- NCI
- ( Place )
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- Australia
- ( Feature type )
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- grid
- ( Service )
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- ANVGL
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- Published_External
Publication Date
2015-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
The filtered potassium grid is a derivative of the 2015 radiometric or gamma-ray grid of Australia. The radiometric grid of Australia is derived by merging over 550 airborne gamma-ray spectrometric surveys by the Commonwealth, State and Territory Governments and held in the national radioelement database of Australia. The cell sizes of the original survey grids range from 50 m through 800 m, but most have a cell size of about 100 m. The original survey grids were levelled and then re-sampled to generate the Radiometric Map of Australia Grids with a cell size of about 100m (0.001 degrees). The data quality varies depending on the survey. The data 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 final grid is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This filtered potassium element concentrations grid is obtained by applying a low-pass filter to the potassium grid. 20170906 NetCDF file restructured to be indexed Southward-positive for improved performance and interoperability
Parent Information
Geophysical Data Collection - radiometrics
UUID - c6b58f54-102d-19e9-e044-00144fdd4fa6,
eCat ID - 74513
Extents
[-43.761500, -9.000500, 112.717500, 153.671500]
Reference System
WGS 84 (geocentric) (EPSG:4328)
Spatial Resolution
Service Information
Associations
Downloads and Links
NetCDF file download via HTTP for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
NCSS for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
Zipped ERS file download via HTTP for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
OPeNDAP service for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
WCS for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
WMS for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
Digital Object Identifier for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
Australian Geophysical Archive Data Delivery System
NetCDF file on NCI filesystem for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
THREDDS catalog page for dataset 221dcfd8-04f4-5083-e053-10a3070a64e3
Source Information
The 2015 radiometric or gamma-ray grid of Australia is made of data acquired during surveys by the Commonwealth, State and Territory Governments.