Full description
Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. 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 Sandstone CompleteSphCapBouguer geodetic is a complete Bouguer anomaly grid for the Sandstone Gravity Survey (P201063). This gravity survey was acquired under the project No. 201063 for the geological survey of WA. The grid has a cell size of 0.005 degrees (approximately 523m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 5760 gravity stations were acquired to produce this grid.
Lineage
Maintenance and Update Frequency: notPlanned
Statement: This Sandstone CompleteSphCapBouguer geodetic is a complete Bouguer anomaly grid for the Sandstone Gravity Survey (P201063). This gravity survey was acquired under the project No. 201063 for the geological survey of WA. The grid has a cell size of 0.005 degrees (approximately 523m). The data are given in units of um/s^2, also known as 'gravity units', or gu. A total of 5760 gravity stations were acquired to produce this grid. The complete Bouguer gravity anomalies were calculated by applying terrain correction (Bullard C - which accounts for the undulations of the surrounding topography) to the spherical cap Bouguer anomaly point data of Sandstone Gravity Survey (P201063). These terrain corrections were calculated using software from INTREPID Geophysics. The Intrepid algorithm utilises concentric rings subdivided into cells (Direen, 2001) to calculate the terrain correction. The data were then gridded using a gridding technique provided by the INTREPID Geophysics software package. The processed data are checked by GA geophysicists using standard methods for assessing quality to ensure that the final data are fit-for-purpose. Details of the specifications of individual surveys held in the Australian National Gravity Database (ANGD) can be found in the Second Edition of the Index of Gravity Surveys (Wynne and Bacchin, 2009).
References:
Direen, N.G., 2001. Application of terrain corrections in Australia (2001). Geoscience Australia, Canberra.https://pid.geoscience.gov.au/dataset/ga/33808;
Intrepid Geophysics, http://www.intrepid-geophysics.com;
Wynne, P., and Bacchin, M., 2009. Index of Gravity Surveys (Second Edition). Geoscience Australia, Record 2009/07.
Created: 09 03 2020
Issued: 09 03 2020
Modified: 05 07 2021
Data time period: 12 08 2010 to 16 12 2010
text: westlimit=118.4937; southlimit=-29.5036; eastlimit=120.0987; northlimit=-25.9786; projection=GDA94 (EPSG:4283)
Subjects
Australia |
Bouguer |
EARTH SCIENCES |
Earth sciences |
GADDS2.0 |
NCI |
Published_External |
WA |
complete |
geophysical survey |
geophysics |
geoscientificInformation |
grav |
gravity |
grid |
ground digital data |
infinie slab |
raster |
survey 201063 |
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Other Information
The Geophysical Archive Data Delivery System (GADDS2) portal provides HTTP download of geophysics datasets in a number of formats. Point and line datasets are available in NetCDF and ASEG-GDF2. Grid datasets are available in NetCDF, GeoTIFF and ERS. (File available for download in various formats from the GADDS2 portal)
url :
https://portal.ga.gov.au/persona/gadds
File download for Sandstone CompleteSphCapBouguer geodetic (Sandstone CompleteSphCapBouguer geodetic file download)
NetCDF Subsetting Service (NCSS) for Sandstone CompleteSphCapBouguer geodetic (Sandstone CompleteSphCapBouguer geodetic NCSS)
OPeNDAP web service for Sandstone CompleteSphCapBouguer geodetic (Sandstone CompleteSphCapBouguer geodetic OPeNDAP)
OGC Web Mapping Service (WMS) for Sandstone CompleteSphCapBouguer geodetic (Sandstone CompleteSphCapBouguer geodetic WMS)
OGC Web Coverage Service (WCS) for Sandstone CompleteSphCapBouguer geodetic (Sandstone CompleteSphCapBouguer geodetic WCS)
Sandstone CompleteSphCapBouguer geodetic NCSS
Sandstone CompleteSphCapBouguer geodetic OPeNDAP
Sandstone CompleteSphCapBouguer geodetic WMS
Sandstone CompleteSphCapBouguer geodetic WCS
Identifiers
- URL : pid.geoscience.gov.au/dataset/ga/143955
- global : bfe56e61-88a2-477c-bf7a-0e7cdc99c05f
