Product catalogue
Transitioning to IGS20, a case study with APREF
As the Central Bureau for the Asia Pacific Reference Frame (APREF), Geoscience Australia were keen to transition to the most up-to-date realisation of a trusted global reference frame from the IGS, being IGS20. However, following adoption of ITRF2020/IGS20 there were apparent site-specific, centimetre-level coordinate inconsistencies between ITRF2020/IGS20 and ITRF2014/IGb14, concerningly presenting as an inconsistent height offset across the APREF network.
The Asia-Pacific Reference Frame (APREF) is a network consisting of more than 1000 stations across the Asia-Pacific region, including ~700 Australian stations as well as global IGS core stations. For our routine analysis of the network, we process GPS-only double-difference observations in network mode and align them to the global reference frame of choice, using the Bernese software. We process daily solutions, and then stack them to generate weekly solutions. We then take these coordinates and apply the Australian Plate Motion Model to acquire GDA2020 coordinates, which is a plate-fixed national datum used widely across Australia, including to calculate the legally traceable coordinates we provide to station owners and operators.
Taking the latest available products (satellite clock and orbit files, and antenna models) from the IGS, APREF (weekly) solutions are aligned to the IGS20 reference system (where IGS20 is the IGS realisation of ITRF2020), however, we found station-specific offsets of our APREF solutions between the ITRF2014/IGb14 and ITRF2020/IG2S0 due to updates in the ground antenna calibration values from igs14.atx to igs20.atx that reached up to 3 cm. Some of the antenna calibration values were updated post-release of ITRF2020 (updates between igsR3.atx and igs20.atx), which results in further inconsistencies at the coordinate level between the APREF solutions and ITRF2020 solutions. This presentation will discuss the challenges faced when implementing a new global frame of reference at the regional level and the impact on downstream users.
We commend the IGS for their efforts in providing high quality, openly available products and services and would like to prompt conversation about the consideration of user requirements for the development of downstream products (such as regional reference frames).
Abstract to be submitted to/presented at the American Geophysical Union (AGU) Fall Meeting 2023 (AGU23) - https://www.agu.org/fall-meeting
Simple
Identification info
- Date (Creation)
- 2023-08-01
- Date (Publication)
- 2024-02-19T03:52:43
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/148664
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Commonwealth of Australia (Geoscience Australia)
Voice Author Riddell, A.
Space Division Internal Contact Author Masoumi, S.
Space Division Internal Contact Author McClusky, S.
Space Division Internal Contact Author Hu, G.
Space Division Internal Contact
- Name
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American Geophysical Union Fall Meeting 2023 (AGU23) 11-15 December 2023 San Francisco, California
- Purpose
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Abstract to be submitted to American Geophysical Union (AGU) Fall Meeting 2023
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Resource provider Space Division
External Contact Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Riddell, A.
Internal Contact
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
))
- Maintenance and update frequency
- Not planned
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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reference frames
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- Keywords
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APREF
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- Keywords
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geospatial fabric
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- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- Keywords
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Asia Pacific Reference Frame - APREF
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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
- Addressee
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Role Organisation / Individual Name Details User Any
- Use constraints
- License
- Use constraints
- Other restrictions
- Other constraints
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© Commonwealth of Australia (Geoscience Australia) 2023
Resource constraints
- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Classification system
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Australian Government Security Classification System
- 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 facsimile
- OnLine resource
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Link to Conference Page
Link to Conference Page
- Distribution format
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- OnLine resource
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Link to Abstract
Link to Abstract
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- OnLine resource
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Download Presentation (pdf) [2.0 MB]
Download Presentation (pdf) [2.0 MB]
- Distribution format
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pdf
- File decompression technique
-
nil
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Resource lineage
- Statement
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Abstract to be submitted to American Geophysical Union (AGU) Fall Meeting 2023
Metadata constraints
- Title
-
Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/46fa3d99-aa46-4fff-8b66-00826599c54e
- 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 Point of contact Riddell, A.
Internal Contact Owner Riddell, A.
Space Division Internal Contact
Type of resource
- Resource scope
- Document
- Name
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Conference Abstract
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/148664
- Date info (Creation)
- 2024-02-18T23:51:40
- Date info (Revision)
- 2024-02-18T23:51:40
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
-
Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
-
Version 2.0, September 2018
- Citation identifier
- http://pid.geoscience.gov.au/dataset/ga/122551