A POTENTIAL OF POLARIMETRIC SAR DATA IN MAPPING FIRST YEAR SEA ICE PRESSURE RIDGES FROM THE COHERENT AND NON-COHERENT COMPONENTS OF HH AND VV CHANNELS
During the early melt period, the air-ice and air-snow temperature conditions may vary from melting to freezing within 12 hours. When solar irradiance and air temperature are at their maximum, the increased wetness of the snow layer coupled with the development of a liquid film on exposed ice faces...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.490.761 2023-05-15T18:18:36+02:00 A POTENTIAL OF POLARIMETRIC SAR DATA IN MAPPING FIRST YEAR SEA ICE PRESSURE RIDGES FROM THE COHERENT AND NON-COHERENT COMPONENTS OF HH AND VV CHANNELS Eric Hudierand Pierre Larouche The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.761 http://las.physik.uni-oldenburg.de/eProceedings/vol04_1/04_1_hudier1.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.761 http://las.physik.uni-oldenburg.de/eProceedings/vol04_1/04_1_hudier1.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://las.physik.uni-oldenburg.de/eProceedings/vol04_1/04_1_hudier1.pdf Ice ridge SAR text ftciteseerx 2016-01-08T08:29:59Z During the early melt period, the air-ice and air-snow temperature conditions may vary from melting to freezing within 12 hours. When solar irradiance and air temperature are at their maximum, the increased wetness of the snow layer coupled with the development of a liquid film on exposed ice faces increases the contrast between ridges and flat ice areas. We present two images recorded at 4 am and 4 pm that show this natural enhancement process of ridges when a liquid phase is pre-sent on ice blocks (4 pm). Besides, it also shows that, on the contrary, the development of new ice crystals during the night create conditions that highly reduce the contrast between ridges and flat ice areas (4 am image). For smooth wet surfaces the backscattering at normal incidence is dominated by the coherent component. In addition, the non-coherent component is maximum at normal incidence. The vari-ability in surface slope orientations being a characteristic of ridge areas, we computed probability densities that pixels from ridge regions would be identified as ridge pixels. Both coherent and non-coherent models show a dependence on block size and the applied threshold value. As antici-pated, the coherent model gives the highest probability levels with a maximum for cubic blocks of 0.4 m. The maximum value with non-coherent backscattering is reached for 1 m blocks. Text Sea ice Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Ice ridge SAR |
spellingShingle |
Ice ridge SAR Eric Hudierand Pierre Larouche A POTENTIAL OF POLARIMETRIC SAR DATA IN MAPPING FIRST YEAR SEA ICE PRESSURE RIDGES FROM THE COHERENT AND NON-COHERENT COMPONENTS OF HH AND VV CHANNELS |
topic_facet |
Ice ridge SAR |
description |
During the early melt period, the air-ice and air-snow temperature conditions may vary from melting to freezing within 12 hours. When solar irradiance and air temperature are at their maximum, the increased wetness of the snow layer coupled with the development of a liquid film on exposed ice faces increases the contrast between ridges and flat ice areas. We present two images recorded at 4 am and 4 pm that show this natural enhancement process of ridges when a liquid phase is pre-sent on ice blocks (4 pm). Besides, it also shows that, on the contrary, the development of new ice crystals during the night create conditions that highly reduce the contrast between ridges and flat ice areas (4 am image). For smooth wet surfaces the backscattering at normal incidence is dominated by the coherent component. In addition, the non-coherent component is maximum at normal incidence. The vari-ability in surface slope orientations being a characteristic of ridge areas, we computed probability densities that pixels from ridge regions would be identified as ridge pixels. Both coherent and non-coherent models show a dependence on block size and the applied threshold value. As antici-pated, the coherent model gives the highest probability levels with a maximum for cubic blocks of 0.4 m. The maximum value with non-coherent backscattering is reached for 1 m blocks. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Eric Hudierand Pierre Larouche |
author_facet |
Eric Hudierand Pierre Larouche |
author_sort |
Eric Hudierand |
title |
A POTENTIAL OF POLARIMETRIC SAR DATA IN MAPPING FIRST YEAR SEA ICE PRESSURE RIDGES FROM THE COHERENT AND NON-COHERENT COMPONENTS OF HH AND VV CHANNELS |
title_short |
A POTENTIAL OF POLARIMETRIC SAR DATA IN MAPPING FIRST YEAR SEA ICE PRESSURE RIDGES FROM THE COHERENT AND NON-COHERENT COMPONENTS OF HH AND VV CHANNELS |
title_full |
A POTENTIAL OF POLARIMETRIC SAR DATA IN MAPPING FIRST YEAR SEA ICE PRESSURE RIDGES FROM THE COHERENT AND NON-COHERENT COMPONENTS OF HH AND VV CHANNELS |
title_fullStr |
A POTENTIAL OF POLARIMETRIC SAR DATA IN MAPPING FIRST YEAR SEA ICE PRESSURE RIDGES FROM THE COHERENT AND NON-COHERENT COMPONENTS OF HH AND VV CHANNELS |
title_full_unstemmed |
A POTENTIAL OF POLARIMETRIC SAR DATA IN MAPPING FIRST YEAR SEA ICE PRESSURE RIDGES FROM THE COHERENT AND NON-COHERENT COMPONENTS OF HH AND VV CHANNELS |
title_sort |
potential of polarimetric sar data in mapping first year sea ice pressure ridges from the coherent and non-coherent components of hh and vv channels |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.761 http://las.physik.uni-oldenburg.de/eProceedings/vol04_1/04_1_hudier1.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
http://las.physik.uni-oldenburg.de/eProceedings/vol04_1/04_1_hudier1.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.490.761 http://las.physik.uni-oldenburg.de/eProceedings/vol04_1/04_1_hudier1.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766195236383490048 |