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Article

Improved Ice Velocity Measurements with Sentinel-1 TOPS Interferometry

1
DTU Space Institute, Technical University of Denmark (DTU), DK-2800 Kongens Lyngby, Denmark
2
Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(12), 2014; https://doi.org/10.3390/rs12122014
Received: 13 May 2020 / Revised: 18 June 2020 / Accepted: 19 June 2020 / Published: 23 June 2020
(This article belongs to the Section Remote Sensing in Geology, Geomorphology and Hydrology)
In recent years, the Sentinel-1 satellites have provided a data archive of unprecedented volume, delivering C-band Synthetic Aperture Radar (SAR) acquisitions over most of the polar ice sheets with a repeat-pass period of 6–12 days using Interferometric Wide swath (IW) imagery acquired in Terrain Observation by Progressive Scans (TOPS) mode. Due to the added complexity of TOPS-mode interferometric processing, however, Sentinel-1 ice velocity measurements currently rely exclusively on amplitude offset tracking, which generates measurements of substantially lower accuracy and spatial resolution than would be possible with Differential SAR Interferometry (DInSAR). The main difficulty associated with TOPS interferometry lies in the spatially variable azimuth phase contribution arising from along-track motion within the scene. We present a Sentinel-1 interferometric processing chain, which reduces the azimuth coupling to the line-of-sight phase signal through a spatially adaptive coregistration refinement incorporating azimuth velocity measurements. The latter are based on available ice velocity mosaics, optionally supplemented by Burst-Overlap Multi-Aperture Interferometry. The DInSAR processing chain is demonstrated for a large drainage basin in Northeast Greenland, encompassing the Northeast Greenland Ice Stream (NEGIS), and integrated with state-of-the-art offset tracking measurements. In the ice sheet interior, the combined DInSAR and offset tracking ice velocity product provides a spatial resolution of 50 × 50 m and 1-sigma accuracies of 0.18 and 0.44 m/y in the x and y components respectively, compared to GPS. View Full-Text
Keywords: ice velocity; Greenland ice sheet; Sentinel-1; TOPS; DInSAR ice velocity; Greenland ice sheet; Sentinel-1; TOPS; DInSAR
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MDPI and ACS Style

Andersen, J.K.; Kusk, A.; Boncori, J.P.M.; Hvidberg, C.S.; Grinsted, A. Improved Ice Velocity Measurements with Sentinel-1 TOPS Interferometry. Remote Sens. 2020, 12, 2014. https://doi.org/10.3390/rs12122014

AMA Style

Andersen JK, Kusk A, Boncori JPM, Hvidberg CS, Grinsted A. Improved Ice Velocity Measurements with Sentinel-1 TOPS Interferometry. Remote Sensing. 2020; 12(12):2014. https://doi.org/10.3390/rs12122014

Chicago/Turabian Style

Andersen, Jonas K.; Kusk, Anders; Boncori, John P.M.; Hvidberg, Christine S.; Grinsted, Aslak. 2020. "Improved Ice Velocity Measurements with Sentinel-1 TOPS Interferometry" Remote Sens. 12, no. 12: 2014. https://doi.org/10.3390/rs12122014

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