Complete Bouguer gravity grid of Bowen Surat survey
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Geophysical Acquisition & Processing Section
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 Bowen_Surat_Gravity_Complete_Bouguer_Anomaly.nc grid is a complete Bouguer anomaly grid for the Bowen Surat survey. This gravity survey was acquired under the project No. 200540 for the geological survey of QLD. The grid has a cell size of 0.00764045 degrees (approximately 800m). A total of 4978 gravity stations were acquired to produce this grid.
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This Bowen_Surat_Gravity_Complete_Bouguer_Anomaly.nc grid is a complete Bouguer anomaly grid for the Bowen Surat survey. This gravity survey was acquired under the project No. 200540 for the geological survey of QLD. The grid has a cell size of 0.00764045 degrees (approximately 800m). A total of 4978 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 Bowen Surat. 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).
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 2017-10-19T01:40:57, 2006-06-07T00:00:00.
Direen, N.G., 2001. Application of terrain corrections in Australia (2001). Intrepid Geophysics. http://www.intrepid-geophysics.com. Wynne, P., and Bacchin, M., 2009. Index of Gravity Surveys (Second Edition). Geoscience Australia, Record 2009/07.