Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observations from a Hybrid-Polarity Perspective
Utilizing several Synthetic Aperture Radar (SAR) missions will provide a data set with higher temporal resolution. It is of great importance to understand the difference between various available sensors and polarization modes and to consider how to homogenize the data sets for a following combined...
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ftdoajarticles:oai:doaj.org/article:5bfe1023d8a245baa6ba580b48dd49b3 2023-05-15T16:18:08+02:00 Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observations from a Hybrid-Polarity Perspective Martine M. Espeseth Camilla Brekke A. Malin Johansson 2017-10-01T00:00:00Z https://doi.org/10.3390/rs9111088 https://doaj.org/article/5bfe1023d8a245baa6ba580b48dd49b3 EN eng MDPI AG https://www.mdpi.com/2072-4292/9/11/1088 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs9111088 https://doaj.org/article/5bfe1023d8a245baa6ba580b48dd49b3 Remote Sensing, Vol 9, Iss 11, p 1088 (2017) synthetic aperture radar multi-sensor full-polarimetry hybrid-polarity sea ice Science Q article 2017 ftdoajarticles https://doi.org/10.3390/rs9111088 2022-12-31T16:12:57Z Utilizing several Synthetic Aperture Radar (SAR) missions will provide a data set with higher temporal resolution. It is of great importance to understand the difference between various available sensors and polarization modes and to consider how to homogenize the data sets for a following combined analysis. In this study, a uniform and consistent analysis across different SAR missions is carried out. Three pairs of overlapping hybrid- and full-polarimetric C-band SAR scenes from the Radar Imaging Satellite-1 (RISAT-1) and Radarsat-2 satellites are used. The overlapping Radarsat-2 and RISAT-1 scenes are taken close in time, with a relatively similar incidence angle covering sea ice in the Fram Strait and Northeast Greenland in September 2015. The main objective of this study is to identify the similarities and dissimilarities between a simulated and a real hybrid-polarity (HP) SAR system. The similarities and dissimilarities between the two sensors are evaluated using 13 HP features. The results indicate a similar separability between the sea ice types identified within the real HP system in RISAT-1 and the simulated HP system from Radarsat-2. The HP features that are sensitive to surface scattering and depolarization due to volume scattering showed great potential for separating various sea ice types. A subset of features (the second parameter in the Stokes vector, the ratio between the HP intensity coefficients, and the α s angle) were affected by the non-circularity property of the transmitted wave in the simulated HP system across all the scene pairs. Overall, the best features, showing high separability between various sea ice types and which are invariant to the non-circularity property of the transmitted wave, are the intensity coefficients from the right-hand circular transmit and the linear horizontal receive channel and the right-hand circular on both the transmit and the receive channel, and the first parameter in the Stokes vector. Article in Journal/Newspaper Fram Strait Greenland Sea ice Directory of Open Access Journals: DOAJ Articles Greenland Remote Sensing 9 11 1088 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
synthetic aperture radar multi-sensor full-polarimetry hybrid-polarity sea ice Science Q |
spellingShingle |
synthetic aperture radar multi-sensor full-polarimetry hybrid-polarity sea ice Science Q Martine M. Espeseth Camilla Brekke A. Malin Johansson Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observations from a Hybrid-Polarity Perspective |
topic_facet |
synthetic aperture radar multi-sensor full-polarimetry hybrid-polarity sea ice Science Q |
description |
Utilizing several Synthetic Aperture Radar (SAR) missions will provide a data set with higher temporal resolution. It is of great importance to understand the difference between various available sensors and polarization modes and to consider how to homogenize the data sets for a following combined analysis. In this study, a uniform and consistent analysis across different SAR missions is carried out. Three pairs of overlapping hybrid- and full-polarimetric C-band SAR scenes from the Radar Imaging Satellite-1 (RISAT-1) and Radarsat-2 satellites are used. The overlapping Radarsat-2 and RISAT-1 scenes are taken close in time, with a relatively similar incidence angle covering sea ice in the Fram Strait and Northeast Greenland in September 2015. The main objective of this study is to identify the similarities and dissimilarities between a simulated and a real hybrid-polarity (HP) SAR system. The similarities and dissimilarities between the two sensors are evaluated using 13 HP features. The results indicate a similar separability between the sea ice types identified within the real HP system in RISAT-1 and the simulated HP system from Radarsat-2. The HP features that are sensitive to surface scattering and depolarization due to volume scattering showed great potential for separating various sea ice types. A subset of features (the second parameter in the Stokes vector, the ratio between the HP intensity coefficients, and the α s angle) were affected by the non-circularity property of the transmitted wave in the simulated HP system across all the scene pairs. Overall, the best features, showing high separability between various sea ice types and which are invariant to the non-circularity property of the transmitted wave, are the intensity coefficients from the right-hand circular transmit and the linear horizontal receive channel and the right-hand circular on both the transmit and the receive channel, and the first parameter in the Stokes vector. |
format |
Article in Journal/Newspaper |
author |
Martine M. Espeseth Camilla Brekke A. Malin Johansson |
author_facet |
Martine M. Espeseth Camilla Brekke A. Malin Johansson |
author_sort |
Martine M. Espeseth |
title |
Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observations from a Hybrid-Polarity Perspective |
title_short |
Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observations from a Hybrid-Polarity Perspective |
title_full |
Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observations from a Hybrid-Polarity Perspective |
title_fullStr |
Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observations from a Hybrid-Polarity Perspective |
title_full_unstemmed |
Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observations from a Hybrid-Polarity Perspective |
title_sort |
assessment of risat-1 and radarsat-2 for sea ice observations from a hybrid-polarity perspective |
publisher |
MDPI AG |
publishDate |
2017 |
url |
https://doi.org/10.3390/rs9111088 https://doaj.org/article/5bfe1023d8a245baa6ba580b48dd49b3 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Fram Strait Greenland Sea ice |
genre_facet |
Fram Strait Greenland Sea ice |
op_source |
Remote Sensing, Vol 9, Iss 11, p 1088 (2017) |
op_relation |
https://www.mdpi.com/2072-4292/9/11/1088 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs9111088 https://doaj.org/article/5bfe1023d8a245baa6ba580b48dd49b3 |
op_doi |
https://doi.org/10.3390/rs9111088 |
container_title |
Remote Sensing |
container_volume |
9 |
container_issue |
11 |
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1088 |
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1766004269372145664 |