Data

First vertical derivative of the Bouguer gravity grid of Australia Wide AFGN Absolute 2015 survey

Geoscience Australia
Geophysical Acquisition & Processing Section
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://pid.geoscience.gov.au/dataset/ga/113398&rft.title=First vertical derivative of the Bouguer gravity grid of Australia Wide AFGN Absolute 2015 survey&rft.identifier=http://pid.geoscience.gov.au/dataset/ga/113398&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.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 Ngururrpa_Gravity_Survey_P201590_SCBA267GUVD.nc grid is a first vertical derivative of the Bouguer anomaly grid for the Australia Wide AFGN Absolute 2015 survey. This gravity survey was acquired under the project No. 201590 for the geological survey of All States. The grid has a cell size of 0.00465964 degrees (approximately 500m). A total of 35 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.This Ngururrpa_Gravity_Survey_P201590_SCBA267GUVD.nc grid is a first vertical derivative grid of the Bouguer anomaly for the Australia Wide AFGN Absolute 2015 survey. This gravity survey was acquired under the project No. 201590 for the geological survey of UNKNOWN. The grid has a cell size of 0.00465964 degrees (approximately 500m). 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 Australia Wide AFGN Absolute 2015 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 2017-10-19T01:39:55, 2015-07-22T00:00:00. 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.&rft.creator=Geophysical Acquisition & Processing Section &rft.date=2015&rft.coverage=northlimit=-20.3369499871; southlimit=-22.2287647383; westlimit=127.222253418; eastLimit=129.025534967&rft.coverage=northlimit=-20.3369499871; southlimit=-22.2287647383; westlimit=127.222253418; eastLimit=129.025534967&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=grid&rft_subject=gravity&rft_subject=first vertical derivative&rft_subject=Bouguer&rft_subject=ground digital data&rft_subject=geophysical survey&rft_subject=survey 201590&rft_subject=NCI&rft_subject=Australia&rft_subject=Earth sciences&rft_subject=geophysics&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

Licence & Rights:

Open Licence view details
CC-BY

Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Access:

Open

Contact Information

clientservices@ga.gov.au

Brief 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 Ngururrpa_Gravity_Survey_P201590_SCBA267GUVD.nc grid is a first vertical derivative of the Bouguer anomaly grid for the Australia Wide AFGN Absolute 2015 survey. This gravity survey was acquired under the project No. 201590 for the geological survey of All States. The grid has a cell size of 0.00465964 degrees (approximately 500m). A total of 35 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.

Lineage

This Ngururrpa_Gravity_Survey_P201590_SCBA267GUVD.nc grid is a first vertical derivative grid of the Bouguer anomaly for the Australia Wide AFGN Absolute 2015 survey. This gravity survey was acquired under the project No. 201590 for the geological survey of UNKNOWN. The grid has a cell size of 0.00465964 degrees (approximately 500m). 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 Australia Wide AFGN Absolute 2015 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 2017-10-19T01:39:55, 2015-07-22T00:00:00.
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.

Issued: 22 07 2015

Data time period: 28 04 2015 to 21 05 2015

This dataset is part of a larger collection

129.02553,-20.33695 129.02553,-22.22876 127.22225,-22.22876 127.22225,-20.33695 129.02553,-20.33695

128.1238941925,-21.2828573627

text: northlimit=-20.3369499871; southlimit=-22.2287647383; westlimit=127.222253418; eastLimit=129.025534967

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Other Information
Fully qualified pathname of NetCDF file on NCI filesystem for dataset 72ce6d19-a9d5-44cc-8bb8-991a0947d9f6. Users must be logged onto the NCI network to access this file system. (md5sum=423401c81f86325f093f19456ea9b7b0) (NetCDF file on NCI filesystem for dataset 72ce6d19-a9d5-44cc-8bb8-991a0947d9f6)

local : file:///g/data1/rr2/ground_gravity/WA/P201590/grid/Ngururrpa_Gravity_Survey_P201590_SCBA267GUVD/Ngururrpa_Gravity_Survey_P201590_SCBA267GUVD.nc

Identifiers