Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica)
Advanced synthetic aperture radar image mode precision (ASAR IMP) scenes of Deception Island from December 2008 to September 2010 have been analysed to assess its potential for snow cover classification. Backscattering was checked against ground truth. Despite the good spatial resolution of the ASAR...
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Online Access: | http://hdl.handle.net/10451/31579 https://doi.org/10.1144/SP381.19 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/31579 2023-05-15T13:59:03+02:00 Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica) Mora, Carla Vieira, Goncalo Ramos, Miguel 2018-02-08T10:53:27Z http://hdl.handle.net/10451/31579 https://doi.org/10.1144/SP381.19 eng eng Geological Society of London 0305-8719 http://hdl.handle.net/10451/31579 doi:10.1144/SP381.19 closedAccess Envisat ASAR IMP Imagery for snow Deception Island Mapping at varying spatial resolution South Shetlands Antarctica article 2018 ftunivlisboa https://doi.org/10.1144/SP381.19 2023-02-08T01:07:17Z Advanced synthetic aperture radar image mode precision (ASAR IMP) scenes of Deception Island from December 2008 to September 2010 have been analysed to assess its potential for snow cover classification. Backscattering was checked against ground truth. Despite the good spatial resolution of the ASAR, its applicability for detecting snow cover, and especially wet snow, was only possible at much lower resolutions, since noise was found to be very high. Scenes with bare ground or with dry snow cover showed highest backscattering, with averages from 210 to 212 dB. Wet snow showed a shift towards lower values, peaking at 215 dB. A threshold of 213 to 214 dB was identified between dry/bare ground and wet snow scenes at Crater Lake. The backscatter difference to a reference snow-free scene usually provided better classification results, and a threshold ranging from 22 to 23 dB was found. Results show that, despite the relative ease of use of C-band ASAR, special care is necessary since the results show significant noise, and it should only be applied to large areas. Large seasonal patterns of snow melt were identified on Deception Island. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Antarc* Antarctica Deception Island Universidade de Lisboa: repositório.UL Asar ENVELOPE(134.033,134.033,68.667,68.667) Crater Lake ENVELOPE(-60.667,-60.667,-62.983,-62.983) Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) Geological Society, London, Special Publications 381 1 481 493 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Envisat ASAR IMP Imagery for snow Deception Island Mapping at varying spatial resolution South Shetlands Antarctica |
spellingShingle |
Envisat ASAR IMP Imagery for snow Deception Island Mapping at varying spatial resolution South Shetlands Antarctica Mora, Carla Vieira, Goncalo Ramos, Miguel Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica) |
topic_facet |
Envisat ASAR IMP Imagery for snow Deception Island Mapping at varying spatial resolution South Shetlands Antarctica |
description |
Advanced synthetic aperture radar image mode precision (ASAR IMP) scenes of Deception Island from December 2008 to September 2010 have been analysed to assess its potential for snow cover classification. Backscattering was checked against ground truth. Despite the good spatial resolution of the ASAR, its applicability for detecting snow cover, and especially wet snow, was only possible at much lower resolutions, since noise was found to be very high. Scenes with bare ground or with dry snow cover showed highest backscattering, with averages from 210 to 212 dB. Wet snow showed a shift towards lower values, peaking at 215 dB. A threshold of 213 to 214 dB was identified between dry/bare ground and wet snow scenes at Crater Lake. The backscatter difference to a reference snow-free scene usually provided better classification results, and a threshold ranging from 22 to 23 dB was found. Results show that, despite the relative ease of use of C-band ASAR, special care is necessary since the results show significant noise, and it should only be applied to large areas. Large seasonal patterns of snow melt were identified on Deception Island. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Mora, Carla Vieira, Goncalo Ramos, Miguel |
author_facet |
Mora, Carla Vieira, Goncalo Ramos, Miguel |
author_sort |
Mora, Carla |
title |
Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica) |
title_short |
Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica) |
title_full |
Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica) |
title_fullStr |
Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica) |
title_full_unstemmed |
Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica) |
title_sort |
evaluation of envisat asar imp imagery for snow mapping at varying spatial resolution (deception island, south shetlands – antarctica) |
publisher |
Geological Society of London |
publishDate |
2018 |
url |
http://hdl.handle.net/10451/31579 https://doi.org/10.1144/SP381.19 |
long_lat |
ENVELOPE(134.033,134.033,68.667,68.667) ENVELOPE(-60.667,-60.667,-62.983,-62.983) ENVELOPE(-60.633,-60.633,-62.950,-62.950) |
geographic |
Asar Crater Lake Deception Island |
geographic_facet |
Asar Crater Lake Deception Island |
genre |
Antarc* Antarctica Deception Island |
genre_facet |
Antarc* Antarctica Deception Island |
op_relation |
0305-8719 http://hdl.handle.net/10451/31579 doi:10.1144/SP381.19 |
op_rights |
closedAccess |
op_doi |
https://doi.org/10.1144/SP381.19 |
container_title |
Geological Society, London, Special Publications |
container_volume |
381 |
container_issue |
1 |
container_start_page |
481 |
op_container_end_page |
493 |
_version_ |
1766267418905149440 |