Validation for Ice Flow Velocity Variations of Shirase Glacier Derived From PALSAR-2 Offset Tracking
We have shown that the flow velocity of Shirase Glacier can be estimated by applying the offset tracking method to the amplitude images derived from the phased array type L-band synthetic aperture radar type-2 (PALSAR-2) onboard the Advanced Land Observing Satellite-2. Although the offset tracking i...
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ftdoajarticles:oai:doaj.org/article:1ada253159a44aba88c4632c9634c161 2023-05-15T18:19:22+02:00 Validation for Ice Flow Velocity Variations of Shirase Glacier Derived From PALSAR-2 Offset Tracking Kazuki Nakamura Shigeru Aoki Tsutomu Yamanokuchi Takeshi Tamura Koichiro Doi 2022-01-01T00:00:00Z https://doi.org/10.1109/JSTARS.2022.3165581 https://doaj.org/article/1ada253159a44aba88c4632c9634c161 EN eng IEEE https://ieeexplore.ieee.org/document/9751448/ https://doaj.org/toc/2151-1535 2151-1535 doi:10.1109/JSTARS.2022.3165581 https://doaj.org/article/1ada253159a44aba88c4632c9634c161 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 15, Pp 3269-3281 (2022) Advanced Land Observing Satellite-2 (ALOS-2) autonomous phase-sensitive radio echo sounder (ApRES) flow velocity phased array type L-band synthetic aperture radar type-2 (PALSAR-2) Shirase Glacier Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 article 2022 ftdoajarticles https://doi.org/10.1109/JSTARS.2022.3165581 2022-12-31T02:49:27Z We have shown that the flow velocity of Shirase Glacier can be estimated by applying the offset tracking method to the amplitude images derived from the phased array type L-band synthetic aperture radar type-2 (PALSAR-2) onboard the Advanced Land Observing Satellite-2. Although the offset tracking is widely used, the method is sometimes not applicable effectively and the reason is not always clear. Here, we consider a possibility of ionospheric contamination and show the validation results of the estimated flow velocity applied the offset tracking method to the PALSAR-2 data, based on in-situ measurement of the flow velocity from the GNSS receiver on the autonomous phase-sensitive radio echo sounder simultaneously with the PALSAR-2 observation. As a result, the ionospheric contamination can yield a spurious error of ±0.2 km a −1 . After statistically removing the erroneous pairs, the RMSE was 0.049 km a −1 derived from the flow velocity error between the in-situ measurement results and estimated from satellite, and the estimated flow velocity obtained using PALSAR-2 data is proved to be in good agreement with the ground truth. Obtained spatial and temporal variations reveal signature of glacier dynamics, which prove the efficacy of the offset tracking method. The obtained ice-flow velocity increases rapidly from the upstream region to the coast, but its velocity is roughly constant over a region, 10-km long about the grounding line (GL), then gradually tends to increase again downstream from the GL. This trend has continued largely unchanged over24 years since 1996. Article in Journal/Newspaper Shirase Glacier Directory of Open Access Journals: DOAJ Articles Shirase Glacier ENVELOPE(39.000,39.000,-70.333,-70.333) IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 15 3269 3281 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Advanced Land Observing Satellite-2 (ALOS-2) autonomous phase-sensitive radio echo sounder (ApRES) flow velocity phased array type L-band synthetic aperture radar type-2 (PALSAR-2) Shirase Glacier Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Advanced Land Observing Satellite-2 (ALOS-2) autonomous phase-sensitive radio echo sounder (ApRES) flow velocity phased array type L-band synthetic aperture radar type-2 (PALSAR-2) Shirase Glacier Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 Kazuki Nakamura Shigeru Aoki Tsutomu Yamanokuchi Takeshi Tamura Koichiro Doi Validation for Ice Flow Velocity Variations of Shirase Glacier Derived From PALSAR-2 Offset Tracking |
topic_facet |
Advanced Land Observing Satellite-2 (ALOS-2) autonomous phase-sensitive radio echo sounder (ApRES) flow velocity phased array type L-band synthetic aperture radar type-2 (PALSAR-2) Shirase Glacier Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 |
description |
We have shown that the flow velocity of Shirase Glacier can be estimated by applying the offset tracking method to the amplitude images derived from the phased array type L-band synthetic aperture radar type-2 (PALSAR-2) onboard the Advanced Land Observing Satellite-2. Although the offset tracking is widely used, the method is sometimes not applicable effectively and the reason is not always clear. Here, we consider a possibility of ionospheric contamination and show the validation results of the estimated flow velocity applied the offset tracking method to the PALSAR-2 data, based on in-situ measurement of the flow velocity from the GNSS receiver on the autonomous phase-sensitive radio echo sounder simultaneously with the PALSAR-2 observation. As a result, the ionospheric contamination can yield a spurious error of ±0.2 km a −1 . After statistically removing the erroneous pairs, the RMSE was 0.049 km a −1 derived from the flow velocity error between the in-situ measurement results and estimated from satellite, and the estimated flow velocity obtained using PALSAR-2 data is proved to be in good agreement with the ground truth. Obtained spatial and temporal variations reveal signature of glacier dynamics, which prove the efficacy of the offset tracking method. The obtained ice-flow velocity increases rapidly from the upstream region to the coast, but its velocity is roughly constant over a region, 10-km long about the grounding line (GL), then gradually tends to increase again downstream from the GL. This trend has continued largely unchanged over24 years since 1996. |
format |
Article in Journal/Newspaper |
author |
Kazuki Nakamura Shigeru Aoki Tsutomu Yamanokuchi Takeshi Tamura Koichiro Doi |
author_facet |
Kazuki Nakamura Shigeru Aoki Tsutomu Yamanokuchi Takeshi Tamura Koichiro Doi |
author_sort |
Kazuki Nakamura |
title |
Validation for Ice Flow Velocity Variations of Shirase Glacier Derived From PALSAR-2 Offset Tracking |
title_short |
Validation for Ice Flow Velocity Variations of Shirase Glacier Derived From PALSAR-2 Offset Tracking |
title_full |
Validation for Ice Flow Velocity Variations of Shirase Glacier Derived From PALSAR-2 Offset Tracking |
title_fullStr |
Validation for Ice Flow Velocity Variations of Shirase Glacier Derived From PALSAR-2 Offset Tracking |
title_full_unstemmed |
Validation for Ice Flow Velocity Variations of Shirase Glacier Derived From PALSAR-2 Offset Tracking |
title_sort |
validation for ice flow velocity variations of shirase glacier derived from palsar-2 offset tracking |
publisher |
IEEE |
publishDate |
2022 |
url |
https://doi.org/10.1109/JSTARS.2022.3165581 https://doaj.org/article/1ada253159a44aba88c4632c9634c161 |
long_lat |
ENVELOPE(39.000,39.000,-70.333,-70.333) |
geographic |
Shirase Glacier |
geographic_facet |
Shirase Glacier |
genre |
Shirase Glacier |
genre_facet |
Shirase Glacier |
op_source |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 15, Pp 3269-3281 (2022) |
op_relation |
https://ieeexplore.ieee.org/document/9751448/ https://doaj.org/toc/2151-1535 2151-1535 doi:10.1109/JSTARS.2022.3165581 https://doaj.org/article/1ada253159a44aba88c4632c9634c161 |
op_doi |
https://doi.org/10.1109/JSTARS.2022.3165581 |
container_title |
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
container_volume |
15 |
container_start_page |
3269 |
op_container_end_page |
3281 |
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1766196439482892288 |