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Open AccessArticle

Glacier Monitoring Using Frequency Domain Offset Tracking Applied to Sentinel-1 Images: A Product Performance Comparison

1
Surrey Space Centre, University of Surrey, Guildford GU2 7XH, UK
2
University of Napoli Federico II, Department of Electrical Engineering and Information Technology, Via Claudio 21, 80125 Napoli, Italy
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(11), 1322; https://doi.org/10.3390/rs11111322
Received: 4 April 2019 / Revised: 28 May 2019 / Accepted: 29 May 2019 / Published: 1 June 2019
(This article belongs to the Special Issue Imaging Floods and Glacier Geohazards with Remote Sensing)
The Sentinel-1 mission has now reached its maturity, and is acquiring high-quality images with a high revisit time, allowing for effective continuous monitoring of our rapidly changing planet. The purpose of this work is to assess the performance of the different synthetic aperture radar products made available by the European Space Agency through the Sentinels Data Hub against glacier displacement monitoring with offset tracking methodology. In particular, four classes of products have been tested: the medium resolution ground range detected, the high-resolution ground range detected, acquired in both interferometric wide and extra-wide swath, and the single look complex. The first are detected pre-processed images with about 40, 25, and 10-m pixel spacing, respectively. The last category, the most commonly adopted for the application at issue, represents the standard coherent synthetic aperture radar product, delivered in unprocessed focused complex format with pixel spacing ranging from 14 to 20 m in azimuth and from approximately 2 to 6 m in range, depending on the acquisition area and mode. Tests have been performed on data acquired over four glaciers, i.e., the Petermann Glacier, the Nioghalvfjerdsfjorden, the Jackobshavn Isbræ and the Thwaites Glacier. They revealed that the displacements estimated using interferometric wide swath single look complex and high-resolution ground range detected products are fully comparable, even at computational level. As a result, considering the differences in memory consumption and pre-processing requirements presented by these two kinds of product, detected formats should be preferred for facing the application. View Full-Text
Keywords: synthetic aperture radar; offset tracking; displacements; Sentinel-1; glacier monitoring synthetic aperture radar; offset tracking; displacements; Sentinel-1; glacier monitoring
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MDPI and ACS Style

Amitrano, D.; Guida, R.; Di Martino, G.; Iodice, A. Glacier Monitoring Using Frequency Domain Offset Tracking Applied to Sentinel-1 Images: A Product Performance Comparison. Remote Sens. 2019, 11, 1322.

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