Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography

Space-based Interferometric Synthetic Aperture Radar (InSAR) applications have been widely used to monitor the cryosphere over past decades. Owing to temporal decorrelation, interferometric coherence often severely degrades on fast moving glaciers. TanDEM-X observations can overcome the temporal dec...

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Published in:Remote Sensing
Main Authors: Sang-Hoon Hong, Shimon Wdowinski, Falk Amelung, Hyun-Cheol Kim, Joong-Sun Won, Sang-Wan Kim
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2018
Subjects:
Q
Online Access:https://doi.org/10.3390/rs10111851
https://doaj.org/article/6bf21f31ae584dc6a65e06a412958c6b
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spelling ftdoajarticles:oai:doaj.org/article:6bf21f31ae584dc6a65e06a412958c6b 2023-05-15T13:07:35+02:00 Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography Sang-Hoon Hong Shimon Wdowinski Falk Amelung Hyun-Cheol Kim Joong-Sun Won Sang-Wan Kim 2018-11-01T00:00:00Z https://doi.org/10.3390/rs10111851 https://doaj.org/article/6bf21f31ae584dc6a65e06a412958c6b EN eng MDPI AG https://www.mdpi.com/2072-4292/10/11/1851 https://doaj.org/toc/2072-4292 2072-4292 doi:10.3390/rs10111851 https://doaj.org/article/6bf21f31ae584dc6a65e06a412958c6b Remote Sensing, Vol 10, Iss 11, p 1851 (2018) TanDEM-X digital elevation model TanDEM-X science phase radar interferometry petermann glacier ambiguity height Science Q article 2018 ftdoajarticles https://doi.org/10.3390/rs10111851 2022-12-31T16:27:35Z Space-based Interferometric Synthetic Aperture Radar (InSAR) applications have been widely used to monitor the cryosphere over past decades. Owing to temporal decorrelation, interferometric coherence often severely degrades on fast moving glaciers. TanDEM-X observations can overcome the temporal decorrelation because of their simultaneous measurements by two satellite constellations. In this study, we used the TanDEM-X pursuit monostatic mode with large baseline formation following a scientific phase timeline to develop highly precise topographic elevation models of the Petermann Glacier of Northwest Greenland. The large baseline provided the advantage of extracting topographic information over low relief areas, such as the surface of a glacier. As expected, coherent interferometric phases (>0.8) were well maintained over the glaciers, despite their fast movement, due to the nearly simultaneous TanDEM-X measurements. The height ambiguity, which was defined as the altitude difference corresponding to a 2π phase change of the flattened interferogram, of the dataset was 10.63 m, which was favorable for extracting topography in a low relief region. We validated the TanDEM-X derived glacial topography by comparing it to the SAR/Interferometric radar altimeter observations acquired by CryoSat-2 and the IceBridge Airborne Topographic Mapper laser altimeter measurements. Both observations showed very good correlation within a few meters of the offsets (−12.5~−3.1 m), with respect to the derived glacial topography. Routine TanDEM-X observations will be very useful to better understand the dynamics of glacial movements and topographic change. Article in Journal/Newspaper Airborne Topographic Mapper glacier Greenland Petermann glacier Directory of Open Access Journals: DOAJ Articles Greenland Remote Sensing 10 11 1851
institution Open Polar
collection Directory of Open Access Journals: DOAJ Articles
op_collection_id ftdoajarticles
language English
topic TanDEM-X
digital elevation model
TanDEM-X science phase
radar interferometry
petermann glacier
ambiguity height
Science
Q
spellingShingle TanDEM-X
digital elevation model
TanDEM-X science phase
radar interferometry
petermann glacier
ambiguity height
Science
Q
Sang-Hoon Hong
Shimon Wdowinski
Falk Amelung
Hyun-Cheol Kim
Joong-Sun Won
Sang-Wan Kim
Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography
topic_facet TanDEM-X
digital elevation model
TanDEM-X science phase
radar interferometry
petermann glacier
ambiguity height
Science
Q
description Space-based Interferometric Synthetic Aperture Radar (InSAR) applications have been widely used to monitor the cryosphere over past decades. Owing to temporal decorrelation, interferometric coherence often severely degrades on fast moving glaciers. TanDEM-X observations can overcome the temporal decorrelation because of their simultaneous measurements by two satellite constellations. In this study, we used the TanDEM-X pursuit monostatic mode with large baseline formation following a scientific phase timeline to develop highly precise topographic elevation models of the Petermann Glacier of Northwest Greenland. The large baseline provided the advantage of extracting topographic information over low relief areas, such as the surface of a glacier. As expected, coherent interferometric phases (>0.8) were well maintained over the glaciers, despite their fast movement, due to the nearly simultaneous TanDEM-X measurements. The height ambiguity, which was defined as the altitude difference corresponding to a 2π phase change of the flattened interferogram, of the dataset was 10.63 m, which was favorable for extracting topography in a low relief region. We validated the TanDEM-X derived glacial topography by comparing it to the SAR/Interferometric radar altimeter observations acquired by CryoSat-2 and the IceBridge Airborne Topographic Mapper laser altimeter measurements. Both observations showed very good correlation within a few meters of the offsets (−12.5~−3.1 m), with respect to the derived glacial topography. Routine TanDEM-X observations will be very useful to better understand the dynamics of glacial movements and topographic change.
format Article in Journal/Newspaper
author Sang-Hoon Hong
Shimon Wdowinski
Falk Amelung
Hyun-Cheol Kim
Joong-Sun Won
Sang-Wan Kim
author_facet Sang-Hoon Hong
Shimon Wdowinski
Falk Amelung
Hyun-Cheol Kim
Joong-Sun Won
Sang-Wan Kim
author_sort Sang-Hoon Hong
title Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography
title_short Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography
title_full Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography
title_fullStr Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography
title_full_unstemmed Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography
title_sort using tandem-x pursuit monostatic observations with a large perpendicular baseline to extract glacial topography
publisher MDPI AG
publishDate 2018
url https://doi.org/10.3390/rs10111851
https://doaj.org/article/6bf21f31ae584dc6a65e06a412958c6b
geographic Greenland
geographic_facet Greenland
genre Airborne Topographic Mapper
glacier
Greenland
Petermann glacier
genre_facet Airborne Topographic Mapper
glacier
Greenland
Petermann glacier
op_source Remote Sensing, Vol 10, Iss 11, p 1851 (2018)
op_relation https://www.mdpi.com/2072-4292/10/11/1851
https://doaj.org/toc/2072-4292
2072-4292
doi:10.3390/rs10111851
https://doaj.org/article/6bf21f31ae584dc6a65e06a412958c6b
op_doi https://doi.org/10.3390/rs10111851
container_title Remote Sensing
container_volume 10
container_issue 11
container_start_page 1851
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