Data

Satellite-derived high-resolution sea-ice motion in the Southern Ocean, 2015-2019 - ESA Sentinel1 Satellite Data

Australian Ocean Data Network
Heil, P. and Hyland, G. ; HEIL, PETRA ; HYLAND, GLENN
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/records/AAS_4301_satellite_Sea_ice_motion&rft.title=Satellite-derived high-resolution sea-ice motion in the Southern Ocean, 2015-2019 - ESA Sentinel1 Satellite Data&rft.identifier=http://data.aad.gov.au/metadata/records/AAS_4301_satellite_Sea_ice_motion&rft.publisher=Australian Antarctic Data Centre&rft.description=Sea-ice motion derived from two (partially) overlapping ESA Sentinel1 [S1]A or B scenes. Satellites S1A/B carry C-band (5.405 GHz) Synthetic Aperture Radar [SAR] sensors. For this data set images from the Extra Wide swath (EW) mode of operation (swath width 410 km) have been used. EW mode data are available as a medium-resolution ground range detected (GRD) product, i.e., resolution of 93 × 87 m and pixel size 40 × 40 m. Approximately two-thirds of the EW mode data recorded over the Antarctic area are dual-polarisation (HH + HV) products. The remainder are mainly single-polarisation (HH) products. For further detail, see ESA's Copernicus web portal. Ice motion is derived from suitable SAR image pairs with sufficient spatial overlap but relatively short time separation, i.e. ideally 6 days or less. Image-crosscorrelation analysis is employed to identify displacement vectors within the image pair.Progress Code: onGoingStatement: With regards to the geolocation accuracy of Sentinel-1 EW high-resolution ground range detected (GRD) product, it has been found that the 3σ accuracy specification is be approximately ±14.4 m (or ±0.36 pixels). This correlation uncertainty is sub-pixel, in agreement with that of Landsat data with an uncertainty of about 0.8 pixel. The accuracy of the image crosscorrelation has a standard deviation of σ = 0.4 pixels (or 16 m). With the geocoding accuracy of 4.8 m (about 0.1 pixels), then this suggests the image-correlation uncertainty is the dominant error component at around ±0.3 pixels. These data will be presented in a manuscript currently in preparation: Improved Antarctic sea-ice motion fields from Sentinel-1 SAR imagery Glenn Hyland, Petra Heil, and others In preparation, 2020&rft.creator=Heil, P. and Hyland, G. &rft.creator=HEIL, PETRA &rft.creator=HYLAND, GLENN &rft.date=2020&rft.coverage=westlimit=-180; southlimit=-80; eastlimit=180; northlimit=-55&rft.coverage=westlimit=-180; southlimit=-80; eastlimit=180; northlimit=-55&rft_rights=This metadata record is publicly available.&rft_rights=These data are not yet publicly available for download.&rft_rights= 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_4301_satellite_Sea_ice_motion when using these data. http://creativecommons.org/licenses/by/4.0/).&rft_rights=Portable Network Graphic&rft_rights=https://i.creativecommons.org/l/by/3.0/88x31.png&rft_rights=Creative Commons by Attribution logo&rft_rights=Attribution 4.0 International (CC BY 4.0)&rft_rights=Legal code for Creative Commons by Attribution 4.0 International license&rft_rights=Attribution 4.0 International (CC BY 4.0)&rft_rights= https://creativecommons.org/licenses/by/4.0/legalcode&rft_subject=oceans&rft_subject=climatologyMeteorologyAtmosphere&rft_subject=EARTH SCIENCE > OCEANS > SEA ICE > SEA ICE MOTION&rft_subject=EARTH SCIENCE > CRYOSPHERE > SEA ICE > SEA ICE MOTION&rft_subject=IMAGE CROSSCORRELATION&rft_subject=SAR > Synthetic Aperture Radar&rft_subject=SATELLITES&rft_subject=SENTINEL-1 > SENTINEL-1A&rft_subject=SENTINEL-1 > SENTINEL-1B&rft_subject=AMD/AU&rft_subject=AMD&rft_subject=ACE/CRC&rft_subject=CEOS&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=CONTINENT > ANTARCTICA&rft.type=dataset&rft.language=English Access the data
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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_4301_satellite_Sea_ice_motion when using these data.
http://creativecommons.org/licenses/by/4.0/).

Attribution 4.0 International (CC BY 4.0)

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This metadata record is publicly available.

These data are not yet publicly available for download.

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Brief description

Sea-ice motion derived from two (partially) overlapping ESA Sentinel1 [S1]A or B scenes. Satellites S1A/B carry C-band (5.405 GHz) Synthetic Aperture Radar [SAR] sensors. For this data set images from the Extra Wide swath (EW) mode of operation (swath width 410 km) have been used. EW mode data are available as a medium-resolution ground range detected (GRD) product, i.e., resolution of 93 × 87 m and pixel size 40 × 40 m. Approximately two-thirds of the EW mode data recorded over the Antarctic area are dual-polarisation (HH + HV) products. The remainder are mainly single-polarisation (HH) products. For further detail, see ESA's Copernicus web portal. Ice motion is derived from suitable SAR image pairs with sufficient spatial overlap but relatively short time separation, i.e. ideally 6 days or less. Image-crosscorrelation analysis is employed to identify displacement vectors within the image pair.

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Progress Code: onGoing
Statement: With regards to the geolocation accuracy of Sentinel-1 EW high-resolution ground range detected (GRD) product, it has been found that the 3σ accuracy specification is be approximately ±14.4 m (or ±0.36 pixels). This correlation uncertainty is sub-pixel, in agreement with that of Landsat data with an uncertainty of about 0.8 pixel. The accuracy of the image crosscorrelation has a standard deviation of σ = 0.4 pixels (or 16 m). With the geocoding accuracy of 4.8 m (about 0.1 pixels), then this suggests the image-correlation uncertainty is the dominant error component at around ±0.3 pixels. These data will be presented in a manuscript currently in preparation: Improved Antarctic sea-ice motion fields from Sentinel-1 SAR imagery Glenn Hyland, Petra Heil, and others In preparation, 2020

Notes

Purpose
A NetCDF-format database of high-resolution(:SAR) Antarctic sea-ice motion vectors.

Data time period: 2015-01-01 to 2019-12-31

This dataset is part of a larger collection

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180,-55 180,-80 0,-80 -180,-80 -180,-55 0,-55 180,-55

0,-67.5

text: westlimit=-180; southlimit=-80; eastlimit=180; northlimit=-55

Subjects
ACE/CRC | AMD | AMD/AU | CEOS | CONTINENT > ANTARCTICA | EARTH SCIENCE > CRYOSPHERE > SEA ICE > SEA ICE MOTION | EARTH SCIENCE > OCEANS > SEA ICE > SEA ICE MOTION | GEOGRAPHIC REGION > POLAR | IMAGE CROSSCORRELATION | OCEAN > SOUTHERN OCEAN | SAR > Synthetic Aperture Radar | SATELLITES | SENTINEL-1 > SENTINEL-1A | SENTINEL-1 > SENTINEL-1B | climatologyMeteorologyAtmosphere | oceans |

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uri : https://data.aad.gov.au/eds/5204/download

Identifiers
  • global : AAS_4301_satellite_Sea_ice_motion
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