Potentials and Limits of Comprehensive 2D Glacier Motion Estimation using Satellite SAR Data

نویسندگان

  • LI FANG
  • OLIVER MAKSYMIUK
  • MICHAEL SCHMITT
  • UWE STILLA
چکیده

In this paper, the potentials and limits of comprehensive 2D motion estimation of glaciers are discussed and illustrated by the example of the Taku glacier, which is the biggest glacier in the Juneau Icefield, Alaska. The motion maps are extracted by the feature tracking technique based on geo-coded high resolution TerraSAR-X images. The estimation results show that successfully deriving comprehensive 2D glacier motions filed using feature tracking by SAR images acquired from only one imaging geometry is hard to achieve, and in areas with a steep slope in the topography the 2D estimations are intrinsically accompanied with significant errors regarding the real magnitude of the velocity. Zusammenfassung: Diese Arbeit befasst sich mit den Möglichkeiten als auch den Beschränkungen einer umfassenden 2D-Geschwindigkeitsschaätzung für Gletscher und zeigt dies am Beispiel des Taku-Gletscher, der größte im Juneau Eisgebiet (Alaska). Die Geschwindigkeitsschätzung erfolgt mittels Merkmalsverfolgung basierend auf den geokodierten TerraSAR-X Daten. Die Ergebnisse zeigen, dass eine robuste Schätzung unter Verwendung von Daten eines einzigen Blickwinkels nur bedingt funktioniert. Es geht vor allem in Gebieten mit einer steilen Topographie mit großen Fehlern in der Größe der Geschwindigkeit einher.

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تاریخ انتشار 2014