First-Year and Multiyear Sea Ice Incidence Angle Normalization of Dual-Polarized Sentinel-1 SAR Images in the Beaufort Sea
Automatic and visual sea ice classification of SAR imagery is impeded by the incidence angle dependence of backscatter intensities. Knowledge of the angular dependence of different ice types is therefore necessary to account for this effect. While consistent estimates exist for HH polarization for d...
Published in: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
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ftdoajarticles:oai:doaj.org/article:8839235313d545c185c099c77e02153c 2023-05-15T15:40:20+02:00 First-Year and Multiyear Sea Ice Incidence Angle Normalization of Dual-Polarized Sentinel-1 SAR Images in the Beaufort Sea Wiebke Aldenhoff Leif E. B. Eriksson Yufang Ye Celine Heuze 2020-01-01T00:00:00Z https://doi.org/10.1109/JSTARS.2020.2977506 https://doaj.org/article/8839235313d545c185c099c77e02153c EN eng IEEE https://ieeexplore.ieee.org/document/9056528/ https://doaj.org/toc/2151-1535 2151-1535 doi:10.1109/JSTARS.2020.2977506 https://doaj.org/article/8839235313d545c185c099c77e02153c IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 13, Pp 1540-1550 (2020) Incidence angle sea ice Sentinel-1 Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 article 2020 ftdoajarticles https://doi.org/10.1109/JSTARS.2020.2977506 2022-12-31T11:24:58Z Automatic and visual sea ice classification of SAR imagery is impeded by the incidence angle dependence of backscatter intensities. Knowledge of the angular dependence of different ice types is therefore necessary to account for this effect. While consistent estimates exist for HH polarization for different ice types, they are lacking HV polarization data, especially for multiyear sea ice. Here we investigate the incidence angle dependence of smooth and rough/deformed first-year and multiyear ice of different ages for wintertime dual-polarization Sentinel-1 C-band SAR imagery in the Beaufort Sea. Assuming a linear relationship, this dependence is determined using the difference in incidence angle and backscatter intensities from ascending and descending images of the same area. At cross-polarization rough/deformed first-year sea ice shows the strongest angular dependence with -0.11 dB/1° followed by multiyear sea ice with -0.07 dB/1°, and old multiyear ice (older than three years) with -0.04 dB/1°. The noise floor is found to have a strong impact on smooth first-year ice and estimated slopes are therefore not fully reliable. At co-polarization, we obtained slope values of -0.24, -0.20, -0.15, and -0.10 dB/1° for smooth first-year, rough/deformed first-year, multiyear, and old multiyear sea ice, respectively. Furthermore, we show that imperfect noise correction of the first subswath influences the obtained slopes for multiyear sea ice. We demonstrate that incidence angle normalization should not only be applied to co-polarization but should also be considered for cross-polarization images to minimize intra ice type variation in backscatter intensity throughout the entire image swath. Article in Journal/Newspaper Beaufort Sea Sea ice Directory of Open Access Journals: DOAJ Articles IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 13 1540 1550 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Incidence angle sea ice Sentinel-1 Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Incidence angle sea ice Sentinel-1 Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 Wiebke Aldenhoff Leif E. B. Eriksson Yufang Ye Celine Heuze First-Year and Multiyear Sea Ice Incidence Angle Normalization of Dual-Polarized Sentinel-1 SAR Images in the Beaufort Sea |
topic_facet |
Incidence angle sea ice Sentinel-1 Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
description |
Automatic and visual sea ice classification of SAR imagery is impeded by the incidence angle dependence of backscatter intensities. Knowledge of the angular dependence of different ice types is therefore necessary to account for this effect. While consistent estimates exist for HH polarization for different ice types, they are lacking HV polarization data, especially for multiyear sea ice. Here we investigate the incidence angle dependence of smooth and rough/deformed first-year and multiyear ice of different ages for wintertime dual-polarization Sentinel-1 C-band SAR imagery in the Beaufort Sea. Assuming a linear relationship, this dependence is determined using the difference in incidence angle and backscatter intensities from ascending and descending images of the same area. At cross-polarization rough/deformed first-year sea ice shows the strongest angular dependence with -0.11 dB/1° followed by multiyear sea ice with -0.07 dB/1°, and old multiyear ice (older than three years) with -0.04 dB/1°. The noise floor is found to have a strong impact on smooth first-year ice and estimated slopes are therefore not fully reliable. At co-polarization, we obtained slope values of -0.24, -0.20, -0.15, and -0.10 dB/1° for smooth first-year, rough/deformed first-year, multiyear, and old multiyear sea ice, respectively. Furthermore, we show that imperfect noise correction of the first subswath influences the obtained slopes for multiyear sea ice. We demonstrate that incidence angle normalization should not only be applied to co-polarization but should also be considered for cross-polarization images to minimize intra ice type variation in backscatter intensity throughout the entire image swath. |
format |
Article in Journal/Newspaper |
author |
Wiebke Aldenhoff Leif E. B. Eriksson Yufang Ye Celine Heuze |
author_facet |
Wiebke Aldenhoff Leif E. B. Eriksson Yufang Ye Celine Heuze |
author_sort |
Wiebke Aldenhoff |
title |
First-Year and Multiyear Sea Ice Incidence Angle Normalization of Dual-Polarized Sentinel-1 SAR Images in the Beaufort Sea |
title_short |
First-Year and Multiyear Sea Ice Incidence Angle Normalization of Dual-Polarized Sentinel-1 SAR Images in the Beaufort Sea |
title_full |
First-Year and Multiyear Sea Ice Incidence Angle Normalization of Dual-Polarized Sentinel-1 SAR Images in the Beaufort Sea |
title_fullStr |
First-Year and Multiyear Sea Ice Incidence Angle Normalization of Dual-Polarized Sentinel-1 SAR Images in the Beaufort Sea |
title_full_unstemmed |
First-Year and Multiyear Sea Ice Incidence Angle Normalization of Dual-Polarized Sentinel-1 SAR Images in the Beaufort Sea |
title_sort |
first-year and multiyear sea ice incidence angle normalization of dual-polarized sentinel-1 sar images in the beaufort sea |
publisher |
IEEE |
publishDate |
2020 |
url |
https://doi.org/10.1109/JSTARS.2020.2977506 https://doaj.org/article/8839235313d545c185c099c77e02153c |
genre |
Beaufort Sea Sea ice |
genre_facet |
Beaufort Sea Sea ice |
op_source |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 13, Pp 1540-1550 (2020) |
op_relation |
https://ieeexplore.ieee.org/document/9056528/ https://doaj.org/toc/2151-1535 2151-1535 doi:10.1109/JSTARS.2020.2977506 https://doaj.org/article/8839235313d545c185c099c77e02153c |
op_doi |
https://doi.org/10.1109/JSTARS.2020.2977506 |
container_title |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
container_volume |
13 |
container_start_page |
1540 |
op_container_end_page |
1550 |
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1766372549994741760 |