Complete spherical cap Bouguer gravity grid of North Perth Gingin Brook Gravity Survey, 2013 survey
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Geophysical Acquisition & Processing Section
Gravity data measure 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 North_Perth_Gingin_Brook_Gravity_CSCBA267GU_Geodetic_p201360.nc grid is a complete spherical cap Bouguer anomaly grid for the North Perth Gingin Brook Gravity Survey, 2013 survey. This gravity survey was acquired under the project No. 201360 for the geological survey of WA. The grid has a cell size of 0.00363308 degrees (approximately 370m). A total of 1253 gravity stations were acquired to produce this grid.
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This North_Perth_Gingin_Brook_Gravity_CSCBA267GU_Geodetic_p201360.nc grid is a complete spherical cap Bouguer anomaly grid for the North Perth Gingin Brook Gravity Survey, 2013 survey. This gravity survey was acquired under the project No. 201360 for the geological survey of WA. The grid has a cell size of 0.00363308 degrees (approximately 370m). A total of 1253 gravity stations were acquired to produce this grid. Three processes are required to correct the gravity observations for the effects of the surrounding topography: (1) a Bouguer correction (Bullard A), which approximates the topography as an infinite horizontal slab; (2) a correction to that horizontal slab for the curvature of the Earth (Bullard B); and (3) a terrain correction (Bullard C), which accounts for the undulations of the surrounding topography. The complete spherical cap Bouguer gravity anomalies were calculated by applying terrain correction (Bullard C) to the spherical cap Bouguer anomaly point data of North Perth Gingin Brook Gravity Survey, 2013. 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 terrain corrected 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).
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 2017-10-19T01:39:58, 2013-12-03T00:00:00.
Intrepid Geophysics. http://www.intrepid-geophysics.com. Wynne, P. and Bacchin, M., 2009. Index of Gravity Surveys (Second Edition). Geoscience Australia, Record 2009/07.
NetCDF file on NCI filesystem for dataset 74625fb7-9458-43a5-a75f-ca9b1d3019ed
THREDDS catalog page for dataset 74625fb7-9458-43a5-a75f-ca9b1d3019ed
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NetCDF file download via HTTP for dataset 74625fb7-9458-43a5-a75f-ca9b1d3019ed
Zipped ERS file download via HTTP for dataset 74625fb7-9458-43a5-a75f-ca9b1d3019ed
OPeNDAP service for dataset 74625fb7-9458-43a5-a75f-ca9b1d3019ed
WCS for dataset 74625fb7-9458-43a5-a75f-ca9b1d3019ed
WMS for dataset 74625fb7-9458-43a5-a75f-ca9b1d3019ed
Australian Geophysical Archive Data Delivery System
This North_Perth_Gingin_Brook_Gravity_CSCBA267GU_Geodetic_p201360.nc grid includes ground gravity point data for the North Perth Gingin Brook Gravity Survey, 2013 survey acquired for the geological survey of WA