Data

Heard Island sea level data Voyage 1 and Voyage 2 2025/26

Australian Antarctic Division
Palmer, K. and Dyer, R. ; PALMER, KAREN ; DYER, ROEK
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://data.aad.gov.au/metadata/AAS_4626_AAP_5198_HIMI_sealevel&rft.title=Heard Island sea level data Voyage 1 and Voyage 2 2025/26&rft.identifier=http://data.aad.gov.au/metadata/AAS_4626_AAP_5198_HIMI_sealevel&rft.publisher=Australian Antarctic Data Centre&rft.description=This dataset includes water levels obtained from two locations using different methods at Heard Island between 19 October 2025 and 18 January 2026 (inclusive). The dataset covers the period between Voyage 1 and Voyage 2 HIMI campaigns during the 2025/26 Antarctic season. Method 1 water levels were obtained via a pressure sensor mounted to a seabed frame temporarily deployed at approximately 5-6 metres water depth in Atlas Cove (bottom pressure). Method 2 water levels were obtained from GNSS (Global Navigation Satellite Systems) data collected at Magnet Point, with preliminary processing using a GNSS interferometric reflectometry (GNSS-IR) approach. The distance between the two installations is approximately 7 kilometres. Atmospheric pressure used in deriving water level from the pressure gauge was obtained from an Automatic Weather Station co-located with the GNSS-IR system. This dataset is a collaborative effort between the Australian Antarctic Data Centre (AADC) bathymetric mapping project (AAP5198), the Maritime Geospatial Warfare Unit of the Royal Australian Navy (RAN), and the Southern Ocean Sea Level Monitoring Project (AAS4626).Progress Code: completedStatement: Sea levels and the offset between the Atlas Cove water depths and the ellipsoid are estimated to be within 0.2 metres accuracy. Sources of uncertainty include: vertical stability of the pressure sensor, estimated height of the weather station above mean sea level, estimated ellipsoidal height of the GNSS monument derived from a single 24 hour AUSPOS solution, phase centre offset of the GNSS antenna (not applied during GNSS-IR processing), ellipsoid slope between Magnet Point and Atlas Cove (not estimated as part of this analysis), and various technical limitations of the preliminary GNSS-IR processing.&rft.creator=Palmer, K. and Dyer, R. &rft.creator=PALMER, KAREN &rft.creator=DYER, ROEK &rft.date=2026&rft.coverage=westlimit=73; southlimit=-53.3; eastlimit=74; northlimit=-52.9&rft.coverage=westlimit=73; southlimit=-53.3; eastlimit=74; northlimit=-52.9&rft_rights=These data are publicly available for download from the provided URL.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4626_AAP_5198_HIMI_sealevel when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=oceans&rft_subject=EARTH SCIENCE > OCEANS > TIDES&rft_subject=EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > SEA LEVEL PRESSURE&rft_subject=EARTH SCIENCE > OCEANS > OCEAN PRESSURE > SEA LEVEL PRESSURE&rft_subject=EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY&rft_subject=4626&rft_subject=AAS 4626&rft_subject=5198&rft_subject=AAS 5198&rft_subject=HYDROGRAPHY&rft_subject=BOTTOM PRESSURE GAUGES&rft_subject=GNSS > GNSS RECEIVERS&rft_subject=R/V Nuyina > R/V Nuyina&rft_subject=AMD/AU&rft_subject=AMD&rft_subject=CEOS&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS&rft.type=dataset&rft.language=English Access the data
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Licence & Rights:

Open Licence view details
CC-BY

Attribution 4.0 International (CC BY 4.0)
https://creativecommons.org/licenses/by/4.0/legalcode

These data are publicly available for download from the provided URL.

This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4626_AAP_5198_HIMI_sealevel when using these data.

This metadata record is publicly available.

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Full description

This dataset includes water levels obtained from two locations using different methods at Heard Island between 19 October 2025 and 18 January 2026 (inclusive). The dataset covers the period between Voyage 1 and Voyage 2 HIMI campaigns during the 2025/26 Antarctic season. Method 1 water levels were obtained via a pressure sensor mounted to a seabed frame temporarily deployed at approximately 5-6 metres water depth in Atlas Cove (bottom pressure). Method 2 water levels were obtained from GNSS (Global Navigation Satellite Systems) data collected at Magnet Point, with preliminary processing using a GNSS interferometric reflectometry (GNSS-IR) approach. The distance between the two installations is approximately 7 kilometres. Atmospheric pressure used in deriving water level from the pressure gauge was obtained from an Automatic Weather Station co-located with the GNSS-IR system. This dataset is a collaborative effort between the Australian Antarctic Data Centre (AADC) bathymetric mapping project (AAP5198), the Maritime Geospatial Warfare Unit of the Royal Australian Navy (RAN), and the Southern Ocean Sea Level Monitoring Project (AAS4626).

Lineage

Progress Code: completed
Statement: Sea levels and the offset between the Atlas Cove water depths and the ellipsoid are estimated to be within 0.2 metres accuracy. Sources of uncertainty include: vertical stability of the pressure sensor, estimated height of the weather station above mean sea level, estimated ellipsoidal height of the GNSS monument derived from a single 24 hour AUSPOS solution, phase centre offset of the GNSS antenna (not applied during GNSS-IR processing), ellipsoid slope between Magnet Point and Atlas Cove (not estimated as part of this analysis), and various technical limitations of the preliminary GNSS-IR processing.

Notes

Purpose
The bottom pressure data were obtained for the purpose of determining tidal datums for bathymetric mapping. The GNSS data were obtained from a permanent installation for monitoring sea levels.

Data time period: 2025-10-19 to 2026-01-18

This dataset is part of a larger collection

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74,-52.9 74,-53.3 73,-53.3 73,-52.9 74,-52.9

73.5,-53.1

text: westlimit=73; southlimit=-53.3; eastlimit=74; northlimit=-52.9

Subjects
4626 | 5198 | AAS 4626 | AAS 5198 | AMD | AMD/AU | BOTTOM PRESSURE GAUGES | CEOS | EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE > SEA LEVEL PRESSURE | EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY | EARTH SCIENCE > OCEANS > OCEAN PRESSURE > SEA LEVEL PRESSURE | EARTH SCIENCE > OCEANS > TIDES | GEOGRAPHIC REGION > POLAR | GNSS > GNSS RECEIVERS | HYDROGRAPHY | OCEAN > SOUTHERN OCEAN > HEARD AND MCDONALD ISLANDS | R/V Nuyina > R/V Nuyina | oceans |

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Other Information
Download the dataset. (GET DATA > DIRECT DOWNLOAD)

url : https://data.aad.gov.au/eds/6191/download

Public information for AAS project AAS_4626 (PROJECT HOME PAGE)

url : https://projects.aad.gov.au/report_project_public.cfm?project_no=AAS_4626

Citation reference for this metadata record and dataset. (VIEW RELATED INFORMATION)

url : https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4626_AAP_5198_HIMI_sealevel

Identifiers
  • global : AAS_4626_AAP_5198_HIMI_sealevel
ACN 633 798 857