Data

GA GNSS-derived Tropospheric Data Products

Geoscience Australia
Wang, C. ; Masoumi, S. ; Riddell, A. ; Ruddick, R. ; Owen, B.
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=info:doi10.26186/150374&rft.title=GA GNSS-derived Tropospheric Data Products&rft.identifier=10.26186/150374&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.description=Geoscience Australia (GA) provides tropospheric Zenith Total Delay (ZTD) products in near-real-time (hourly) as well as on a daily basis. These delays are derived from Global Navigation Satellite System (GNSS) signals measured at Continuously Operated Reference Sites (CORS) across multiple networks including the Australian Regional GNSS Network (ARGN), the Asia-Pacific Reference Frame (APREF), the South Pacific Regional GNSS Network (SPRGN), and the International GNSS Service (IGS). Data from these continuous stations are accessed from the Australian National Positioning Infrastructure Data Collection.GA operates as an analysis center of the European Meteorological Services Network (EUMETNET) Economic Interest Group (EIG) GNSS water vapour programme (E-GVAP, https://egvap.dmi.dk/). GA GNSS derived troposphere data products are provided to E-GVAP, Australian Bureau of Meteorology (BoM) and the United Kingdom's Meteorological Office (UK Met Office).Maintenance and Update Frequency: quarterlyStatement: GA established the GNSS-derived ZTD data product since 2016. Two types of ZTD are produced using different IGS products (Ultra-Rapid products and Rapid products). Currently, the Bernese v5.2. software package is used for the ZTD estimation using a Precise Point Positioning (PPP) strategy with dual-frequency observations. Near-real-time (Ultra-Rapid) ZTD is produced every hour with 40 minutes latency. Daily (Rapid) ZTD is produced daily by post processing of GNSS measurements but still outputs hourly ZTD with superior quality compared to near-real-time ZTD for comparison and research purposes.&rft.creator=Wang, C. &rft.creator=Masoumi, S. &rft.creator=Riddell, A. &rft.creator=Ruddick, R. &rft.creator=Owen, B. &rft.date=2016&rft.coverage=westlimit=45.00; southlimit=-90.00; eastlimit=168.00; northlimit=-9.00&rft.coverage=westlimit=45.00; southlimit=-90.00; eastlimit=168.00; northlimit=-9.00&rft_rights=© Commonwealth of Australia (Geoscience Australia) 2025&rft_rights=Australian Government Security Classification System https://www.protectivesecurity.gov.au/publications-library/policy-8-classification-system&rft_subject=geoscientificInformation&rft_subject=GPS&rft_subject=ZTD&rft_subject=Weather forecasting&rft_subject=GNSS&rft_subject=Troposphere delay&rft_subject=Global Navigation Satellite Systems&rft_subject=Global Positioning System&rft_subject=Zenith Total Delay&rft_subject=CRCSI&rft_subject=Meteorology&rft_subject=Geodesy&rft_subject=HVC_144503&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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© Commonwealth of Australia (Geoscience Australia) 2025

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https://www.protectivesecurity.gov.au/publications-library/policy-8-classification-system

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Geoscience Australia (GA) provides tropospheric Zenith Total Delay (ZTD) products in near-real-time (hourly) as well as on a daily basis. These delays are derived from Global Navigation Satellite System (GNSS) signals measured at Continuously Operated Reference Sites (CORS) across multiple networks including the Australian Regional GNSS Network (ARGN), the Asia-Pacific Reference Frame (APREF), the South Pacific Regional GNSS Network (SPRGN), and the International GNSS Service (IGS). Data from these continuous stations are accessed from the Australian National Positioning Infrastructure Data Collection.

GA operates as an analysis center of the European Meteorological Services Network (EUMETNET) Economic Interest Group (EIG) GNSS water vapour programme (E-GVAP, https://egvap.dmi.dk/). GA GNSS derived troposphere data products are provided to E-GVAP, Australian Bureau of Meteorology (BoM) and the United Kingdom's Meteorological Office (UK Met Office).

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Maintenance and Update Frequency: quarterly
Statement:
GA established the GNSS-derived ZTD data product since 2016. Two types of ZTD are produced using different IGS products (Ultra-Rapid products and Rapid products). Currently, the Bernese v5.2. software package is used for the ZTD estimation using a Precise Point Positioning (PPP) strategy with dual-frequency observations. Near-real-time (Ultra-Rapid) ZTD is produced every hour with 40 minutes latency. Daily (Rapid) ZTD is produced daily by post processing of GNSS measurements but still outputs hourly ZTD with superior quality compared to near-real-time ZTD for comparison and research purposes.

Notes

Purpose
GNSS-derived troposphere data products can be used as input to weather models for improved weather forecasting. The GA GNSS-derived ZTD products have been ingested into the operational weather forecasting model of the Australian Bureau of Meteorology (BoM) since 2020. In addition. UK's Met Office utilise GA's ZTD products for global weather forecast modeling.

Created: 28 11 2016

Issued: 09 07 2025

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168,-9 168,-86 45,-86 45,-9 168,-9

106.5,-49.5

text: westlimit=45.00; southlimit=-90.00; eastlimit=168.00; northlimit=-9.00

Subjects
CRCSI | GNSS | GPS | Geodesy | Global Navigation Satellite Systems | Global Positioning System | HVC_144503 | Meteorology | Published_External | Troposphere delay | Weather forecasting | ZTD | Zenith Total Delay | geoscientificInformation |

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Link to data

url : https://ga-gnss-products-v1.s3.amazonaws.com/index.html#public/

Australian National Positioning Infrastructure Data Collection

local : 144503

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