Data

Satellite-derived high-resolution sea-ice motion, 2007-2011 - Envisat Satellite Data collected under AAS project 4301

Australian Antarctic Division
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/AAS_4301_Envisat_sea_ice_motion&rft.title=Satellite-derived high-resolution sea-ice motion, 2007-2011 - Envisat Satellite Data collected under AAS project 4301&rft.identifier=http://data.aad.gov.au/metadata/AAS_4301_Envisat_sea_ice_motion&rft.publisher=Australian Antarctic Data Centre&rft.description=Envisat was was launched on 01/03/2002, by ESA and operated until 08/04/2012. It provided suitable imagery for the austral winters (May - November) of 2007 to 2011. Envisat caried a C-band (5.33 GHz; wavelength ∼ 5.6 cm) Advanced Synthetic Aperture Radar [ASAR], capable to acquire data in multiple modes (image, alternating polarization, wave, ScanSAR (wide swath), and ScanSAR (global monitoring)) at various incidence angles and in several polarisations. Of ASAR's five distinct measurement modes, the following two modes may be used to derive sea-ice motion from overlapping images in our project: 1. ASAR Wide Swath Mode -- 400 km by 400 km wide swath image. Spatial resolution of approximately 150 m by 150 m for nominal product. VV or HH polarization. 2. ASAR Global Monitoring Mode -- Spatial resolution of approximately 1000 m in azimuth by 1000 m in range for nominal product. Up to a full orbit of coverage. HH or VV polarization.For further detail, see ESA's Copernicus web portal.Sea-ice motion is derived from suitable SAR image pairs with sufficient spatial overlap but relatively short time separation, i.e. ideally 6days or less. Image-crosscorrelation analysis is employed to identify displacement vectors within the image pair. The underlying processing and analysis is part of the (mostly) automated IMCORR [IMageCORRelation] Processing, Analysis and Display System [IPADS]. This study uses C-band (HH polarisation) ASAR scenes, with an image pixel size of 75 m across a 405 km swath. -- For further information see Giles et al., Semi-automated feature-tracking of East Antarctic sea ice from Envisat ASAR imagery, Remote Sensing of Environment, 115, 2267-2276, 2011.Acknowledgement: All Envisat ASAR data are courtesy of the European Space Agency, and were obtained under agreement with ESA.The International Space Science Institute (ISSI), Bern, Switzerland, is acknowledged for supporting this study via Projects 137 and 169.Progress Code: completedStatement: The geolocation accuracy of the relevant Envisat ASAR products have an absolute error of up to 750 m (10 pixels) due to inaccuracies in the positional specifications in the SAR image headers. However, as the sea-ice motion applies a differencing technique, the absolute errors offset each other and derived ice displacement are in the order of 1.5pixels width or 115m.&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=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_4301_Envisat_sea_ice_motion when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=oceans&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=ENVISAT > Environmental Satellite&rft_subject=ACE/CRC&rft_subject=AMD&rft_subject=CEOS&rft_subject=AMD/AU&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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Attribution 4.0 International (CC BY 4.0)
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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_4301_Envisat_sea_ice_motion when using these data.

This metadata record is publicly available.

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Full description

Envisat was was launched on 01/03/2002, by ESA and operated until 08/04/2012. It provided suitable imagery for the austral winters (May - November) of 2007 to 2011. Envisat caried a C-band (5.33 GHz; wavelength ∼ 5.6 cm) Advanced Synthetic Aperture Radar [ASAR], capable to acquire data in multiple modes (image, alternating polarization, wave, ScanSAR (wide swath), and ScanSAR (global monitoring)) at various incidence angles and in several polarisations.

Of ASAR's five distinct measurement modes, the following two modes may be used to derive sea-ice motion from overlapping images in our project:
1. ASAR Wide Swath Mode -- 400 km by 400 km wide swath image. Spatial resolution of approximately 150 m by 150 m for nominal product. VV or HH polarization.
2. ASAR Global Monitoring Mode -- Spatial resolution of approximately 1000 m in azimuth by 1000 m in range for nominal product. Up to a full orbit of coverage. HH or VV polarization.
For further detail, see ESA's Copernicus web portal.

Sea-ice motion is derived from suitable SAR image pairs with sufficient spatial overlap but relatively short time separation, i.e. ideally 6days or less. Image-crosscorrelation analysis is employed to identify displacement vectors within the image pair. The underlying processing and analysis is part of the (mostly) automated IMCORR [IMageCORRelation] Processing, Analysis and Display System [IPADS]. This study uses C-band (HH polarisation) ASAR scenes, with an image pixel size of 75 m across a 405 km swath. -- For further information see Giles et al., Semi-automated feature-tracking of East Antarctic sea ice from Envisat ASAR imagery, Remote Sensing of Environment, 115, 2267-2276, 2011.

Acknowledgement:
All Envisat ASAR data are courtesy of the European Space Agency, and were obtained under agreement with ESA.
The International Space Science Institute (ISSI), Bern, Switzerland, is acknowledged for supporting this study via Projects 137 and 169.

Lineage

Progress Code: completed
Statement: The geolocation accuracy of the relevant Envisat ASAR products have an absolute error of up to 750 m (10 pixels) due to inaccuracies in the positional specifications in the SAR image headers. However, as the sea-ice motion applies a differencing technique, the absolute errors offset each other and derived ice displacement are in the order of 1.5pixels width or 115m.

Notes

Purpose
The purpose of this dataset was to create a NetCDF-format database of high-resolution(:SAR) Antarctic sea-ice motion vectors.

Data time period: 2007-01-05 to 2011-11-30

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

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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 | ENVISAT > Environmental Satellite | GEOGRAPHIC REGION > POLAR | IMAGE CROSSCORRELATION | OCEAN > SOUTHERN OCEAN | SAR > Synthetic Aperture Radar | oceans |

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

uri : https://data.aad.gov.au/eds/5207/download

Public information for AAS project 4301 (PROJECT HOME PAGE)

uri : https://projects.aad.gov.au/search_projects_results.cfm?project_no=4301

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

uri : https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4301_Envisat_sea_ice_motion

Identifiers
  • global : AAS_4301_Envisat_sea_ice_motion