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Remote Sens. 2018, 10(11), 1851; https://doi.org/10.3390/rs10111851

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

1
Department of Geological Sciences, Pusan National University, Pusan 46241, Korea
2
Department of Earth & Environment, Florida International University, FL 33199, USA
3
Department of Marine Geosciences, University of Miami, FL 33149, USA
4
Unit of Arctic Sea-Ice Prediction, Korea Polar Research Institute, Incheon 21990, Korea
5
Department of Earth System Sciences, Yonsei University, Seoul 03722, Korea
6
Department of Energy & Mineral Resources Engineering, Sejong University, Seoul 05006, Korea
*
Author to whom correspondence should be addressed.
Received: 3 October 2018 / Revised: 11 November 2018 / Accepted: 13 November 2018 / Published: 21 November 2018
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Abstract

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. View Full-Text
Keywords: TanDEM-X; digital elevation model; TanDEM-X science phase; radar interferometry; petermann glacier; ambiguity height TanDEM-X; digital elevation model; TanDEM-X science phase; radar interferometry; petermann glacier; ambiguity height
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hong, S.-H.; Wdowinski, S.; Amelung, F.; Kim, H.-C.; Won, J.-S.; Kim, S.-W. Using TanDEM-X Pursuit Monostatic Observations with a Large Perpendicular Baseline to Extract Glacial Topography. Remote Sens. 2018, 10, 1851.

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