A Dual-Threshold Algorithm for Ice-Covered Lake Water Level Retrieval Using Sentinel-3 SAR Altimetry Waveforms
Satellite altimetry has been proven to measure water levels in lakes and rivers effectively. The Sentinel-3A satellite is equipped with a dual-frequency synthetic aperture radar altimeter (SRAL), which allows for inland water levels to be measured with higher precision and improved spatial resolutio...
Published in: | Sensors |
---|---|
Main Authors: | , , , , , |
Format: | Text |
Language: | English |
Published: |
MDPI
2023
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10748291/ http://www.ncbi.nlm.nih.gov/pubmed/38139570 https://doi.org/10.3390/s23249724 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:10748291 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:10748291 2024-01-28T10:05:57+01:00 A Dual-Threshold Algorithm for Ice-Covered Lake Water Level Retrieval Using Sentinel-3 SAR Altimetry Waveforms Tang, Fucai Chen, Peng An, Zhiyuan Xiong, Mingzhu Chen, Hao Qiu, Liangcai 2023-12-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10748291/ http://www.ncbi.nlm.nih.gov/pubmed/38139570 https://doi.org/10.3390/s23249724 en eng MDPI http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10748291/ http://www.ncbi.nlm.nih.gov/pubmed/38139570 http://dx.doi.org/10.3390/s23249724 © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Sensors (Basel) Article Text 2023 ftpubmed https://doi.org/10.3390/s23249724 2023-12-31T01:44:22Z Satellite altimetry has been proven to measure water levels in lakes and rivers effectively. The Sentinel-3A satellite is equipped with a dual-frequency synthetic aperture radar altimeter (SRAL), which allows for inland water levels to be measured with higher precision and improved spatial resolution. However, in regions at middle and high latitudes, where many lakes are covered by ice during the winter, the non-uniformity of the altimeter footprint can substantially impact the accuracy of water level estimates, resulting in abnormal readings when applying standard SRAL synthetic aperture radar (SAR) waveform retracking algorithms (retrackers). In this study, a modified method is proposed to determine the current surface type of lakes, analyzing changes in backscattering coefficients and brightness temperature. This method aligns with ground station observations and ensures consistent surface type classification. Additionally, a dual-threshold algorithm that addresses the limitations of the original bimodal algorithm by identifying multiple peaks without needing elevation correction is introduced. This innovative approach significantly enhances the precision of equivalent water level measurements for ice-covered lakes. The study retrieves and compares the water level data of nine North American lakes covered by ice from 2016–2019 using the dual-threshold and the SAMOSA-3 algorithm with in situ data. For Lake Athabasca, Cedar Lake, Great Slave Lake, Lake Winnipeg, and Lake Erie, the root mean square error (RMSE) of SAMOSA-3 is 39.58 cm, 46.18 cm, 45.75 cm, 42.64 cm, and 6.89 cm, respectively. However, the dual-threshold algorithm achieves an RMSE of 6.75 cm, 9.47 cm, 5.90 cm, 7.67 cm, and 5.01 cm, respectively, representing a decrease of 75%, 79%, 87%, 82%, and 27%, respectively, compared to SAMOSA-3. The dual-threshold algorithm can accurately estimate water levels in ice-covered lakes during winter. It offers a promising prospect for achieving long-term, continuous, and high-precision water level measurements ... Text Great Slave Lake Lake Athabasca PubMed Central (PMC) Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) The Sentinel ENVELOPE(73.317,73.317,-52.983,-52.983) Sensors 23 24 9724 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Article |
spellingShingle |
Article Tang, Fucai Chen, Peng An, Zhiyuan Xiong, Mingzhu Chen, Hao Qiu, Liangcai A Dual-Threshold Algorithm for Ice-Covered Lake Water Level Retrieval Using Sentinel-3 SAR Altimetry Waveforms |
topic_facet |
Article |
description |
Satellite altimetry has been proven to measure water levels in lakes and rivers effectively. The Sentinel-3A satellite is equipped with a dual-frequency synthetic aperture radar altimeter (SRAL), which allows for inland water levels to be measured with higher precision and improved spatial resolution. However, in regions at middle and high latitudes, where many lakes are covered by ice during the winter, the non-uniformity of the altimeter footprint can substantially impact the accuracy of water level estimates, resulting in abnormal readings when applying standard SRAL synthetic aperture radar (SAR) waveform retracking algorithms (retrackers). In this study, a modified method is proposed to determine the current surface type of lakes, analyzing changes in backscattering coefficients and brightness temperature. This method aligns with ground station observations and ensures consistent surface type classification. Additionally, a dual-threshold algorithm that addresses the limitations of the original bimodal algorithm by identifying multiple peaks without needing elevation correction is introduced. This innovative approach significantly enhances the precision of equivalent water level measurements for ice-covered lakes. The study retrieves and compares the water level data of nine North American lakes covered by ice from 2016–2019 using the dual-threshold and the SAMOSA-3 algorithm with in situ data. For Lake Athabasca, Cedar Lake, Great Slave Lake, Lake Winnipeg, and Lake Erie, the root mean square error (RMSE) of SAMOSA-3 is 39.58 cm, 46.18 cm, 45.75 cm, 42.64 cm, and 6.89 cm, respectively. However, the dual-threshold algorithm achieves an RMSE of 6.75 cm, 9.47 cm, 5.90 cm, 7.67 cm, and 5.01 cm, respectively, representing a decrease of 75%, 79%, 87%, 82%, and 27%, respectively, compared to SAMOSA-3. The dual-threshold algorithm can accurately estimate water levels in ice-covered lakes during winter. It offers a promising prospect for achieving long-term, continuous, and high-precision water level measurements ... |
format |
Text |
author |
Tang, Fucai Chen, Peng An, Zhiyuan Xiong, Mingzhu Chen, Hao Qiu, Liangcai |
author_facet |
Tang, Fucai Chen, Peng An, Zhiyuan Xiong, Mingzhu Chen, Hao Qiu, Liangcai |
author_sort |
Tang, Fucai |
title |
A Dual-Threshold Algorithm for Ice-Covered Lake Water Level Retrieval Using Sentinel-3 SAR Altimetry Waveforms |
title_short |
A Dual-Threshold Algorithm for Ice-Covered Lake Water Level Retrieval Using Sentinel-3 SAR Altimetry Waveforms |
title_full |
A Dual-Threshold Algorithm for Ice-Covered Lake Water Level Retrieval Using Sentinel-3 SAR Altimetry Waveforms |
title_fullStr |
A Dual-Threshold Algorithm for Ice-Covered Lake Water Level Retrieval Using Sentinel-3 SAR Altimetry Waveforms |
title_full_unstemmed |
A Dual-Threshold Algorithm for Ice-Covered Lake Water Level Retrieval Using Sentinel-3 SAR Altimetry Waveforms |
title_sort |
dual-threshold algorithm for ice-covered lake water level retrieval using sentinel-3 sar altimetry waveforms |
publisher |
MDPI |
publishDate |
2023 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10748291/ http://www.ncbi.nlm.nih.gov/pubmed/38139570 https://doi.org/10.3390/s23249724 |
long_lat |
ENVELOPE(-114.001,-114.001,61.500,61.500) ENVELOPE(73.317,73.317,-52.983,-52.983) |
geographic |
Great Slave Lake The Sentinel |
geographic_facet |
Great Slave Lake The Sentinel |
genre |
Great Slave Lake Lake Athabasca |
genre_facet |
Great Slave Lake Lake Athabasca |
op_source |
Sensors (Basel) |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10748291/ http://www.ncbi.nlm.nih.gov/pubmed/38139570 http://dx.doi.org/10.3390/s23249724 |
op_rights |
© 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
op_doi |
https://doi.org/10.3390/s23249724 |
container_title |
Sensors |
container_volume |
23 |
container_issue |
24 |
container_start_page |
9724 |
_version_ |
1789332531958513664 |