An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes
Terrain displacement due to the seasonal thaw of the active layer above permafrost can be sensitive to climate change; however, its accurate characterization remains a challenge. This study aimed to improve the measurement of the subsidence or vertical ground surface displacement using differential...
Published in: | International Journal of Applied Earth Observation and Geoinformation |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2024
|
Subjects: | |
Online Access: | https://doi.org/10.1016/j.jag.2024.103975 https://doaj.org/article/93086852a32e4e73823e6b1921fb2a43 |
id |
ftdoajarticles:oai:doaj.org/article:93086852a32e4e73823e6b1921fb2a43 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:93086852a32e4e73823e6b1921fb2a43 2024-09-09T20:02:53+00:00 An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes Yongjie Xia Baoxin Hu Jianguo Wang Glen Brown 2024-07-01T00:00:00Z https://doi.org/10.1016/j.jag.2024.103975 https://doaj.org/article/93086852a32e4e73823e6b1921fb2a43 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S1569843224003297 https://doaj.org/toc/1569-8432 1569-8432 doi:10.1016/j.jag.2024.103975 https://doaj.org/article/93086852a32e4e73823e6b1921fb2a43 International Journal of Applied Earth Observations and Geoinformation, Vol 131, Iss , Pp 103975- (2024) Permafrost InSAR Phase unwrapping Region-growing Displacement Object-based Physical geography GB3-5030 Environmental sciences GE1-350 article 2024 ftdoajarticles https://doi.org/10.1016/j.jag.2024.103975 2024-08-05T17:49:01Z Terrain displacement due to the seasonal thaw of the active layer above permafrost can be sensitive to climate change; however, its accurate characterization remains a challenge. This study aimed to improve the measurement of the subsidence or vertical ground surface displacement using differential synthetic aperture radar interferometry (InSAR). Existing methods for reliable phase unwrapping are hindered by the decorrelation between time-series of SAR acquisitions that can result due to the heterogeneity and structural sensitivity of permafrost landscapes to external conditions. In this study, an advanced phase unwrapping method was proposed, in which three types of regions, namely non-residue, sparse residue, and dense residue objects, were obtained from wrapped interferogram and residue map using a segmentation method. Two variants of Polynomial-Based Region Growing Phase Unwrapping (PBRGPU) were developed, which are sparse-residue Object-based PBRGPU(SOP) and dense-residue Object-based PBRGPU(DOP). The results demonstrated that the proposed method outperformed the existing phase unwrapping methods by partially suppressing the decorrelation phase and enhancing robustness for complex terrain deformation in the absence of measured field data. Both the PBRGPU variants and segmentation strategies compose the object-based unwrapping method for permafrost, and also provide a new framework by combining the segmentations and scenarios for phase unwrapping for permafrost regions. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles International Journal of Applied Earth Observation and Geoinformation 131 103975 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Permafrost InSAR Phase unwrapping Region-growing Displacement Object-based Physical geography GB3-5030 Environmental sciences GE1-350 |
spellingShingle |
Permafrost InSAR Phase unwrapping Region-growing Displacement Object-based Physical geography GB3-5030 Environmental sciences GE1-350 Yongjie Xia Baoxin Hu Jianguo Wang Glen Brown An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes |
topic_facet |
Permafrost InSAR Phase unwrapping Region-growing Displacement Object-based Physical geography GB3-5030 Environmental sciences GE1-350 |
description |
Terrain displacement due to the seasonal thaw of the active layer above permafrost can be sensitive to climate change; however, its accurate characterization remains a challenge. This study aimed to improve the measurement of the subsidence or vertical ground surface displacement using differential synthetic aperture radar interferometry (InSAR). Existing methods for reliable phase unwrapping are hindered by the decorrelation between time-series of SAR acquisitions that can result due to the heterogeneity and structural sensitivity of permafrost landscapes to external conditions. In this study, an advanced phase unwrapping method was proposed, in which three types of regions, namely non-residue, sparse residue, and dense residue objects, were obtained from wrapped interferogram and residue map using a segmentation method. Two variants of Polynomial-Based Region Growing Phase Unwrapping (PBRGPU) were developed, which are sparse-residue Object-based PBRGPU(SOP) and dense-residue Object-based PBRGPU(DOP). The results demonstrated that the proposed method outperformed the existing phase unwrapping methods by partially suppressing the decorrelation phase and enhancing robustness for complex terrain deformation in the absence of measured field data. Both the PBRGPU variants and segmentation strategies compose the object-based unwrapping method for permafrost, and also provide a new framework by combining the segmentations and scenarios for phase unwrapping for permafrost regions. |
format |
Article in Journal/Newspaper |
author |
Yongjie Xia Baoxin Hu Jianguo Wang Glen Brown |
author_facet |
Yongjie Xia Baoxin Hu Jianguo Wang Glen Brown |
author_sort |
Yongjie Xia |
title |
An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes |
title_short |
An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes |
title_full |
An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes |
title_fullStr |
An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes |
title_full_unstemmed |
An object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes |
title_sort |
object-based region-growing phase unwrapping method for mapping vertical displacement in permafrost landscapes |
publisher |
Elsevier |
publishDate |
2024 |
url |
https://doi.org/10.1016/j.jag.2024.103975 https://doaj.org/article/93086852a32e4e73823e6b1921fb2a43 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
International Journal of Applied Earth Observations and Geoinformation, Vol 131, Iss , Pp 103975- (2024) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S1569843224003297 https://doaj.org/toc/1569-8432 1569-8432 doi:10.1016/j.jag.2024.103975 https://doaj.org/article/93086852a32e4e73823e6b1921fb2a43 |
op_doi |
https://doi.org/10.1016/j.jag.2024.103975 |
container_title |
International Journal of Applied Earth Observation and Geoinformation |
container_volume |
131 |
container_start_page |
103975 |
_version_ |
1809934795369611264 |