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Monitoring Alpine Glacier activity by a combined use of TerraSAR-X images and continuous GPS measurements - the Argentière glacier experiment

Trouvé, Emmanuel and Pétillot, Ivan and Gay, Michel and Bombrun, Lionel and Nicolas, Jean-Marie and Tupin, Florence and Walpersdorf, Andrea and Cotte, Nathalie and Hajnsek, Irena and Keller, Martin (2008) Monitoring Alpine Glacier activity by a combined use of TerraSAR-X images and continuous GPS measurements - the Argentière glacier experiment. In: Proceedings of the European Conference on Synthetic Aperture Radar (EUSAR), p. 4. VDE. European Conference on Synthetic Aperture Radar (EUSAR), 2008-06-02 - 2008-06-05, Friedrichshafen, Germany.

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Official URL: http://www.eusar.de/Conferences_en/EUSAR+2008/

Abstract

The monitoring of Alpine glacier activity is one of the applications which require the combined use of ground measurements and SAR data, and should become feasible thanks to the TerraSAR-X mission characteristics. The high resolution images and the relatively short repeat cycle will allow new investigations over moving glacier surface made of ice, firm, snow and rocks. Surface motion analysis will benefit from either the higher resolution or the dual polarization for feature tracking approaches and from the increased interferometric potential to obtain displacement fields by differential SAR Interferometry (D-InSAR). However, several difficulties have to be solved in order to obtain reliable displacement measurements over the fast moving Alpine glaciers. The three main limitations which affect the D-InSAR approach are the coherence preservation, the atmospheric artifacts and the unknown phase unwrapping offsets when the moving surface cannot be connected to a non-moving area. In order to investigate these issues on Alpine glaciers, series of TerraSAR-X images are expected to be acquired over the Chamonix Mont-Blanc test-site which includes well-known glaciers such as the Mer-de-Glace glacier (the second European largest glacier complex) and the Argentière glacier which has been monitored and instrumented for several decades by different scientific teams. Moreover, a corner reflector (CR) provided by the DLR and a continuous GPS recording station have been fixed on the ice on the upper part of the glacier during an E-SAR campaign in February 2007. Two other non-moving continuous GPS stations have been installed, one near the glacier at 2700 meter height and one down in the Chamonix valley. Despite the difficulties to maintain this equipment on the moving and changing glacier surface, it should allow us to perform several experiment based on the detection of the CR with a high accuracy in the TerraSAR-X images and the knowledge of its position by the GPS data. The CR displacement will be used either as ground truth for performance assessment or as complementary data for solving D-InSAR phase unwrapping ambiguity. The 3 continuous GPS stations will be used to study the electromagnetic path delay variations and to correct the atmospheric perturbations in the SAR based glacier motion measurements. This paper will present the experiment and the first result analysis from the data acquired during winter 2007/2008.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Monitoring Alpine Glacier activity by a combined use of TerraSAR-X images and continuous GPS measurements - the Argentière glacier experiment
Authors:
AuthorsInstitution or Email of Authors
Trouvé, EmmanuelLISTIC
Pétillot, IvanLISTIC
Gay, MichelINP Grenoble
Bombrun, LionelINP Grenoble
Nicolas, Jean-MarieGET Télécom Paris
Tupin, FlorenceGET Télécom Paris
Walpersdorf, AndreaLGIT, Grenoble
Cotte, NathalieLGIT, Grenoble
Hajnsek, IrenaUNSPECIFIED
Keller, MartinUNSPECIFIED
Date:June 2008
Journal or Publication Title:Proceedings of the European Conference on Synthetic Aperture Radar (EUSAR)
Refereed publication:No
In ISI Web of Science:No
Page Range:p. 4
Publisher:VDE
Status:Published
Keywords:TerraSAR-X, Glacier, Argentiere, X-band, dual polarimetry
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Friedrichshafen, Germany
Event Type:international Conference
Event Dates:2008-06-02 - 2008-06-05
Organizer:Astrium EADS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Prosmart, Smart-SAR (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute
Microwaves and Radar Institute > SAR Technology
Deposited By: Dr.rer.nat. Irena Hajnsek
Deposited On:16 Dec 2008
Last Modified:12 Dec 2013 20:35

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