Regional high-resolution fast ice maps - Satellite synthetic aperture radar (SAR) data
Progress Code: completed Purpose The purpose of this dataset was to develop an algorithm to derive high spatial- and -temporal resolution maps of fast ice from time series of satellite SAR data in specific regions. Provision of the data in support of the Japanese Cape Darnley Polynya project (involv...
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Online Access: | https://researchdata.edu.au/regional-high-resolution-sar-data/2819271 |
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ftands:oai:ands.org.au::2819271 2023-10-09T21:47:01+02:00 Regional high-resolution fast ice maps - Satellite synthetic aperture radar (SAR) data Spatial: westlimit=50; southlimit=-70; eastlimit=80; northlimit=-65 Temporal: From 2008-05-01 to 2008-11-30 https://researchdata.edu.au/regional-high-resolution-sar-data/2819271 unknown Australian Ocean Data Network https://researchdata.edu.au/regional-high-resolution-sar-data/2819271 AAS_4116_Fast-Ice-SAR Dataset DOI AU/AADC > Australian Antarctic Data Centre, Australia oceans climatologyMeteorologyAtmosphere EARTH SCIENCE > CRYOSPHERE > SEA ICE > POLYNYAS ICE TYPES ICE EXTENT OCEANS > FAST ICE TIME SERIES MAPPING ASAR > Advanced Synthetic Aperature Radar ENVISAT > Environmental Satellite ACE/CRC AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA > CAPE DARNLEY POLYNYA dataset ftands 2023-09-18T22:45:29Z Progress Code: completed Purpose The purpose of this dataset was to develop an algorithm to derive high spatial- and -temporal resolution maps of fast ice from time series of satellite SAR data in specific regions. Provision of the data in support of the Japanese Cape Darnley Polynya project (involving Australian collaboration). This dataset comprises high spatial- and temporal-resolution maps of coastal landfast sea ice (fast ice) distribution in the vicinity of the Cape Darnley Polynya in East Antarctica, in the June-November (winter-spring) periods of 2008 and 2009. The maps were derived from cross-correlation of pairs of spatially-overlapping Envisat Advanced Synthetic Aperture Radar (ASAR) images, using a modified version of the IMCORR algorithm to determine vectors of sea-ice motion (as described in Giles et al., 2011). Fast ice is then distinguished from moving pack ice by the fact that it is stationary. The raw ASAR WSM data (swath width 500 km) were processed using ENVI image processing software to produce geo-referenced images with a 75m pixel size. Use of SAR data ensures coverage uninterrupted by cloud cover or polar darkness. Image pairs were chosen with a time separation between 2 and 21 days. IMCORR processing of the image pairs for mapping fast ice follows Giles et al (2011) – using a reference tile size of 32x32 pixels and a search tile size of 64 x 64 pixels. A land mask was applied to avoid contamination from matches on stationary features over the continental ice sheet. The grid spacing was set to 16 x 16 pixels, so the images were over-sampled by a factor of 2 to provide a more dense set of results. Stationary fast ice vectors were chosen from the IMCORR results using a combination of the cluster search technique and a variation of the z-axis threshold technique as detailed in Giles et al (2011). The cluster search technique was applied to the IMCORR results from each image pair to derive the initial set of valid vectors – this set could contain both stationary fast ice vectors and ... Dataset Antarc* Antarctica East Antarctica Ice Sheet Sea ice Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Southern Ocean East Antarctica Asar ENVELOPE(134.033,134.033,68.667,68.667) Darnley ENVELOPE(69.717,69.717,-67.717,-67.717) Giles ENVELOPE(-137.617,-137.617,-75.150,-75.150) Cape Darnley ENVELOPE(69.567,69.567,-67.738,-67.738) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans climatologyMeteorologyAtmosphere EARTH SCIENCE > CRYOSPHERE > SEA ICE > POLYNYAS ICE TYPES ICE EXTENT OCEANS > FAST ICE TIME SERIES MAPPING ASAR > Advanced Synthetic Aperature Radar ENVISAT > Environmental Satellite ACE/CRC AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA > CAPE DARNLEY POLYNYA |
spellingShingle |
oceans climatologyMeteorologyAtmosphere EARTH SCIENCE > CRYOSPHERE > SEA ICE > POLYNYAS ICE TYPES ICE EXTENT OCEANS > FAST ICE TIME SERIES MAPPING ASAR > Advanced Synthetic Aperature Radar ENVISAT > Environmental Satellite ACE/CRC AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA > CAPE DARNLEY POLYNYA Regional high-resolution fast ice maps - Satellite synthetic aperture radar (SAR) data |
topic_facet |
oceans climatologyMeteorologyAtmosphere EARTH SCIENCE > CRYOSPHERE > SEA ICE > POLYNYAS ICE TYPES ICE EXTENT OCEANS > FAST ICE TIME SERIES MAPPING ASAR > Advanced Synthetic Aperature Radar ENVISAT > Environmental Satellite ACE/CRC AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA > CAPE DARNLEY POLYNYA |
description |
Progress Code: completed Purpose The purpose of this dataset was to develop an algorithm to derive high spatial- and -temporal resolution maps of fast ice from time series of satellite SAR data in specific regions. Provision of the data in support of the Japanese Cape Darnley Polynya project (involving Australian collaboration). This dataset comprises high spatial- and temporal-resolution maps of coastal landfast sea ice (fast ice) distribution in the vicinity of the Cape Darnley Polynya in East Antarctica, in the June-November (winter-spring) periods of 2008 and 2009. The maps were derived from cross-correlation of pairs of spatially-overlapping Envisat Advanced Synthetic Aperture Radar (ASAR) images, using a modified version of the IMCORR algorithm to determine vectors of sea-ice motion (as described in Giles et al., 2011). Fast ice is then distinguished from moving pack ice by the fact that it is stationary. The raw ASAR WSM data (swath width 500 km) were processed using ENVI image processing software to produce geo-referenced images with a 75m pixel size. Use of SAR data ensures coverage uninterrupted by cloud cover or polar darkness. Image pairs were chosen with a time separation between 2 and 21 days. IMCORR processing of the image pairs for mapping fast ice follows Giles et al (2011) – using a reference tile size of 32x32 pixels and a search tile size of 64 x 64 pixels. A land mask was applied to avoid contamination from matches on stationary features over the continental ice sheet. The grid spacing was set to 16 x 16 pixels, so the images were over-sampled by a factor of 2 to provide a more dense set of results. Stationary fast ice vectors were chosen from the IMCORR results using a combination of the cluster search technique and a variation of the z-axis threshold technique as detailed in Giles et al (2011). The cluster search technique was applied to the IMCORR results from each image pair to derive the initial set of valid vectors – this set could contain both stationary fast ice vectors and ... |
format |
Dataset |
title |
Regional high-resolution fast ice maps - Satellite synthetic aperture radar (SAR) data |
title_short |
Regional high-resolution fast ice maps - Satellite synthetic aperture radar (SAR) data |
title_full |
Regional high-resolution fast ice maps - Satellite synthetic aperture radar (SAR) data |
title_fullStr |
Regional high-resolution fast ice maps - Satellite synthetic aperture radar (SAR) data |
title_full_unstemmed |
Regional high-resolution fast ice maps - Satellite synthetic aperture radar (SAR) data |
title_sort |
regional high-resolution fast ice maps - satellite synthetic aperture radar (sar) data |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.edu.au/regional-high-resolution-sar-data/2819271 |
op_coverage |
Spatial: westlimit=50; southlimit=-70; eastlimit=80; northlimit=-65 Temporal: From 2008-05-01 to 2008-11-30 |
long_lat |
ENVELOPE(134.033,134.033,68.667,68.667) ENVELOPE(69.717,69.717,-67.717,-67.717) ENVELOPE(-137.617,-137.617,-75.150,-75.150) ENVELOPE(69.567,69.567,-67.738,-67.738) |
geographic |
Southern Ocean East Antarctica Asar Darnley Giles Cape Darnley |
geographic_facet |
Southern Ocean East Antarctica Asar Darnley Giles Cape Darnley |
genre |
Antarc* Antarctica East Antarctica Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet Sea ice Southern Ocean |
op_source |
AU/AADC > Australian Antarctic Data Centre, Australia |
op_relation |
https://researchdata.edu.au/regional-high-resolution-sar-data/2819271 AAS_4116_Fast-Ice-SAR Dataset DOI |
_version_ |
1779309680727687168 |