Recognizing the Shape and Size of Tundra Lakes in Synthetic Aperture Radar (SAR) Images Using Deep Learning Segmentation
Permafrost tundra contains more than twice as much carbon as is currently in the atmosphere, and it is warming six times as fast as the global mean. Tundra lakes dynamics is a robust indicator of global climate processes, and is still not well understood. Satellite data, particularly, from synthetic...
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ftdoajarticles:oai:doaj.org/article:799ab4abd5d3407cbd85206a18903539 2023-05-15T15:14:00+02:00 Recognizing the Shape and Size of Tundra Lakes in Synthetic Aperture Radar (SAR) Images Using Deep Learning Segmentation Denis Demchev Ivan Sudakow Alexander Khodos Irina Abramova Dmitry Lyakhov Dominik Michels 2023-02-01T00:00:00Z https://doi.org/10.3390/rs15051298 https://doaj.org/article/799ab4abd5d3407cbd85206a18903539 EN eng MDPI AG https://www.mdpi.com/2072-4292/15/5/1298 https://doaj.org/toc/2072-4292 doi:10.3390/rs15051298 2072-4292 https://doaj.org/article/799ab4abd5d3407cbd85206a18903539 Remote Sensing, Vol 15, Iss 1298, p 1298 (2023) tundra lakes synthetic aperture radar Sentinel-1 U-Net size distribution Arctic Science Q article 2023 ftdoajarticles https://doi.org/10.3390/rs15051298 2023-03-12T01:28:58Z Permafrost tundra contains more than twice as much carbon as is currently in the atmosphere, and it is warming six times as fast as the global mean. Tundra lakes dynamics is a robust indicator of global climate processes, and is still not well understood. Satellite data, particularly, from synthetic aperture radar (SAR) is a suitable tool for tundra lakes recognition and monitoring of their changes. However, manual analysis of lake boundaries can be slow and inefficient; therefore, reliable automated algorithms are required. To address this issue, we propose a two-stage approach, comprising instance deep-learning-based segmentation by U-Net, followed by semantic segmentation based on a watershed algorithm for separating touching and overlapping lakes. Implementation of this concept is essential for accurate sizes and shapes estimation of an individual lake. Here, we evaluated the performance of the proposed approach on lakes, manually extracted from tens of C-band SAR images from Sentinel-1, which were collected in the Yamal Peninsula and Alaska areas in the summer months of 2015–2022. An accuracy of 0.73, in terms of the Jaccard similarity index, was achieved. The lake’s perimeter, area and fractal sizes were estimated, based on the algorithm framework output from hundreds of SAR images. It was recognized as lognormal distributed. The evaluation of the results indicated the efficiency of the proposed approach for accurate automatic estimation of tundra lake shapes and sizes, and its potential to be used for further studies on tundra lake dynamics, in the context of global climate change, aimed at revealing new factors that could cause the planet to warm or cool. Article in Journal/Newspaper Arctic Climate change permafrost Tundra Yamal Peninsula Alaska Directory of Open Access Journals: DOAJ Articles Arctic Yamal Peninsula ENVELOPE(69.873,69.873,70.816,70.816) Remote Sensing 15 5 1298 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
tundra lakes synthetic aperture radar Sentinel-1 U-Net size distribution Arctic Science Q |
spellingShingle |
tundra lakes synthetic aperture radar Sentinel-1 U-Net size distribution Arctic Science Q Denis Demchev Ivan Sudakow Alexander Khodos Irina Abramova Dmitry Lyakhov Dominik Michels Recognizing the Shape and Size of Tundra Lakes in Synthetic Aperture Radar (SAR) Images Using Deep Learning Segmentation |
topic_facet |
tundra lakes synthetic aperture radar Sentinel-1 U-Net size distribution Arctic Science Q |
description |
Permafrost tundra contains more than twice as much carbon as is currently in the atmosphere, and it is warming six times as fast as the global mean. Tundra lakes dynamics is a robust indicator of global climate processes, and is still not well understood. Satellite data, particularly, from synthetic aperture radar (SAR) is a suitable tool for tundra lakes recognition and monitoring of their changes. However, manual analysis of lake boundaries can be slow and inefficient; therefore, reliable automated algorithms are required. To address this issue, we propose a two-stage approach, comprising instance deep-learning-based segmentation by U-Net, followed by semantic segmentation based on a watershed algorithm for separating touching and overlapping lakes. Implementation of this concept is essential for accurate sizes and shapes estimation of an individual lake. Here, we evaluated the performance of the proposed approach on lakes, manually extracted from tens of C-band SAR images from Sentinel-1, which were collected in the Yamal Peninsula and Alaska areas in the summer months of 2015–2022. An accuracy of 0.73, in terms of the Jaccard similarity index, was achieved. The lake’s perimeter, area and fractal sizes were estimated, based on the algorithm framework output from hundreds of SAR images. It was recognized as lognormal distributed. The evaluation of the results indicated the efficiency of the proposed approach for accurate automatic estimation of tundra lake shapes and sizes, and its potential to be used for further studies on tundra lake dynamics, in the context of global climate change, aimed at revealing new factors that could cause the planet to warm or cool. |
format |
Article in Journal/Newspaper |
author |
Denis Demchev Ivan Sudakow Alexander Khodos Irina Abramova Dmitry Lyakhov Dominik Michels |
author_facet |
Denis Demchev Ivan Sudakow Alexander Khodos Irina Abramova Dmitry Lyakhov Dominik Michels |
author_sort |
Denis Demchev |
title |
Recognizing the Shape and Size of Tundra Lakes in Synthetic Aperture Radar (SAR) Images Using Deep Learning Segmentation |
title_short |
Recognizing the Shape and Size of Tundra Lakes in Synthetic Aperture Radar (SAR) Images Using Deep Learning Segmentation |
title_full |
Recognizing the Shape and Size of Tundra Lakes in Synthetic Aperture Radar (SAR) Images Using Deep Learning Segmentation |
title_fullStr |
Recognizing the Shape and Size of Tundra Lakes in Synthetic Aperture Radar (SAR) Images Using Deep Learning Segmentation |
title_full_unstemmed |
Recognizing the Shape and Size of Tundra Lakes in Synthetic Aperture Radar (SAR) Images Using Deep Learning Segmentation |
title_sort |
recognizing the shape and size of tundra lakes in synthetic aperture radar (sar) images using deep learning segmentation |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/rs15051298 https://doaj.org/article/799ab4abd5d3407cbd85206a18903539 |
long_lat |
ENVELOPE(69.873,69.873,70.816,70.816) |
geographic |
Arctic Yamal Peninsula |
geographic_facet |
Arctic Yamal Peninsula |
genre |
Arctic Climate change permafrost Tundra Yamal Peninsula Alaska |
genre_facet |
Arctic Climate change permafrost Tundra Yamal Peninsula Alaska |
op_source |
Remote Sensing, Vol 15, Iss 1298, p 1298 (2023) |
op_relation |
https://www.mdpi.com/2072-4292/15/5/1298 https://doaj.org/toc/2072-4292 doi:10.3390/rs15051298 2072-4292 https://doaj.org/article/799ab4abd5d3407cbd85206a18903539 |
op_doi |
https://doi.org/10.3390/rs15051298 |
container_title |
Remote Sensing |
container_volume |
15 |
container_issue |
5 |
container_start_page |
1298 |
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1766344500845740032 |