Application of terrain corrections in Australia (2001)
A set of recommendations for application of automated terrain correction of gravity anomalies in Australia.
Recent improvements in position and elevation determinations due to Differential GPS have led to substantial improvements in the accuracy and precision of observed gravity data, and a general renaissance in the use of gravimetry in Australia. Increasingly, users of the data are specifying levels of precision in derived measurements such as the Bouguer Anomaly, that reflect only these positioning improvements without considering topographic effects on precision. The consequence has been that most gravity data routinely submitted to the National Gravity Database are Simple Bouguer Anomalies only, and contain a range of unquantifiable acquisition noise that degrades the quality of the overall dataset. This paper briefly describes the principles behind the terrain correction of observed gravity data, and outlines one method of rapidly calculating the value of a 'first pass' terrain correction for gravity values in Australia. This method makes use of the widely available 9 second Digital Elevation Model of Australia and the IntrepidTM geophysical software package developed jointly by the Australian Geological Survey Organisation and Des Fitzgerald & Associates. The assumptions and pitfalls behind this particular method are also described. A comparison between the Intrepid method and traditional Hammer-chart manual methods is described using a test dataset from northern Tasmania. The comparison shows that the IntrepidTM method is suitable for applying coarse corrections using the generally available DEM. However, the limitations of the DEM itself prevent use in extreme topographic situations, where a more detailed DEM is needed. Overall, in Australian conditions, the method should prove practical. Finally, test data are also provided on an ftp site to allow users to test their own terrain correction algorithms.
Simple
Identification info
- Date (Publication)
- 2000-01-01T00:00:00
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/33808
- Cited responsible party
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Role Organisation / Individual Name Details Author Direen, N.G.
1
- Point of contact
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Role Organisation / Individual Name Details Custodian MNHD
Owner Commonwealth of Australia (Geoscience Australia)
Custodian Commonwealth of Australia (Geoscience Australia)
Voice
- Topic category
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- Geoscientific information
- Maintenance and update frequency
- Unknown
Resource format
- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Keywords
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GA Publication
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Other Publication
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- Theme
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gravity
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Earth Sciences
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Download the file (pdf)
Download the file (pdf)
- Distribution format
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pdf
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Resource lineage
- Statement
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Unknown
- Hierarchy level
- Non geographic dataset
- Other
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GA Publication
- Description
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Source data not available.
Metadata constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/a05f7892-b2b8-7506-e044-00144fdd4fa6
- Title
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GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice
Type of resource
- Resource scope
- Non geographic dataset
- Name
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nonGeographicDataset
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/33808
- Date info (Revision)
- 2018-04-20T06:04:30
- Date info (Creation)
- 2000-06-07T00:00:00
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551