Authors / CoAuthors
Geophysical Acquisition & Processing Section
Abstract
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 East_Kimberley_Airborne_Gravity_2016_FVDBGL2500M_267_Geodetic.nc grid is a first vertical derivative of the Bouguer anomaly grid for the UNKNOWN survey. This UNKNOWNsurvey was acquired under the project No. UNKNOWN for the geological survey of UNKNOWN. The grid has a cell size of 0.00521 degrees (approximately 570m). A total of UNKNOWN UNKNOWN gravity stations were acquired to produce the original grid. A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid.
Product Type
dataset
eCat Id
113301
Contact for the resource
Owner
Custodian
Point of contact
Digital Object Identifier
Keywords
- ( Theme )
-
- gravity
- ( Theme )
-
- first vertical derivative
- ( Theme )
-
- Bouguer
- ( Theme )
-
- ground digital data
- ( Theme )
-
- geophysical survey
- ( Project )
-
- UNKNOWN
- ( Data centre )
-
- NCI
- ( Discipline )
-
- Earth sciences
- ( Discipline )
-
- geophysics
- ( Feature type )
-
- grid
- ( Place )
-
- Australia
-
- Published_External
Publication Date
2011-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This East_Kimberley_Airborne_Gravity_2016_FVDBGL2500M_267_Geodetic.nc grid is a first vertical derivative grid of the Bouguer anomaly for the UNKNOWN survey. This gravity survey was acquired under the project No. UNKNOWN for the geological survey of UNKNOWN. The grid has a cell size of 0.00521 degrees (approximately 570m). A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the Spherical Cap/complete Spherical cap/Bouguer gravity grid of the UNKNOWN survey to produce this grid. This grid was calculated using an algorithm from 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. The first vertical derivative grid is very helpful for the enhancement of near surface features and structural features such as faults and dykes. 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). 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 2016-08-29T10:51:42, 2013-05-03T00:00:00. References Intrepid Geophysics. http://www.intrepid-geophysics.com. Wynne, P., and Bacchin, M., 2009. Index of Gravity Surveys (Second Edition). Geoscience Australia, Record 2009/07.
Parent Information
Geophysical Data Collection - gravity
UUID - c6b58f54-102c-19e9-e044-00144fdd4fa6,
eCat ID - 74512
Extents
[-19.445097, -14.141317, 126.502261, 129.440701]
Reference System
WGS 84 (geocentric) (EPSG:4328)
Spatial Resolution
Service Information
Associations
Downloads and Links
Digital Object Identifier for dataset 90987628-1752-46db-9cf0-e6748beb77fe
NetCDF file on NCI filesystem for dataset 90987628-1752-46db-9cf0-e6748beb77fe
NetCDF file download via HTTP for dataset 90987628-1752-46db-9cf0-e6748beb77fe
NCSS for dataset 90987628-1752-46db-9cf0-e6748beb77fe
Zipped ERS file download via HTTP for dataset 90987628-1752-46db-9cf0-e6748beb77fe
OPeNDAP service for dataset 90987628-1752-46db-9cf0-e6748beb77fe
WCS for dataset 90987628-1752-46db-9cf0-e6748beb77fe
Source Information
This East_Kimberley_Airborne_Gravity_2016_FVDBGL2500M_267_Geodetic.nc grid includes ground gravity point data for the UNKNOWN survey acquired for the geological survey of UNKNOWN