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 NTGS_Victoria_Basin_Gravity_P201582_CSCBA267GUVD.nc grid is a first vertical derivative of the Bouguer anomaly grid for the Victoria Basin Gravity survey. This gravity survey was acquired under the project No. 201582 for the geological survey of NT. The grid has a cell size of 0.00734872 degrees (approximately 800m). A total of 6173 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
113392
Contact for the resource
Owner
Custodian
Point of contact
Keywords
- ( Feature type )
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- grid
- ( Theme )
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- gravity
- ( Theme )
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- first vertical derivative
- ( Theme )
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- Bouguer
- ( Theme )
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- ground digital data
- ( Theme )
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- geophysical survey
- ( Project )
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- survey 201582
- ( Data centre )
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- NCI
- ( Place )
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- Australia
- ( Place )
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- NT
- ( Discipline )
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- Earth sciences
- ( Discipline )
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- geophysics
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- Published_External
Publication Date
2015-12-10T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
This NTGS_Victoria_Basin_Gravity_P201582_CSCBA267GUVD.nc grid is a first vertical derivative grid of the Bouguer anomaly for the Victoria Basin Gravity survey. This gravity survey was acquired under the project No. 201582 for the geological survey of NT. The grid has a cell size of 0.00734872 degrees (approximately 800m). 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 Victoria Basin Gravity 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 2017-10-19T01:52:43, 2015-12-10T00:00:00. 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
[-17.3759364674, -14.6054679319, 128.951140894, 133.213400179]
Reference System
WGS 84 (geocentric) (EPSG:4328)
Spatial Resolution
Service Information
Associations
Downloads and Links
NetCDF file on NCI filesystem for dataset 194e8ce2-b5d6-4113-82e5-95624aa255f5
THREDDS catalog page for dataset 194e8ce2-b5d6-4113-82e5-95624aa255f5
NCSS for dataset 194e8ce2-b5d6-4113-82e5-95624aa255f5
NetCDF file download via HTTP for dataset 194e8ce2-b5d6-4113-82e5-95624aa255f5
Zipped ERS file download via HTTP for dataset 194e8ce2-b5d6-4113-82e5-95624aa255f5
OPeNDAP service for dataset 194e8ce2-b5d6-4113-82e5-95624aa255f5
WCS for dataset 194e8ce2-b5d6-4113-82e5-95624aa255f5
Source Information
This NTGS_Victoria_Basin_Gravity_P201582_CSCBA267GUVD.nc grid includes ground gravity point data for the Victoria Basin Gravity survey acquired for the geological survey of NT