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Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry

Villano, Michelangelo und Papathanassiou, Konstantinos P. (2011) Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry. In: Proceedings of ESA POLinSAR Workshop. ESA Communications. ESA POLinSAR Workshop, 2011-01-24 - 2011-01-28, Frascati, Italy.

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Kurzfassung

The estimation of the local differential shift between synthetic aperture radar (SAR) images has proven to be an effective technique for monitoring glacier surface motion. As images acquired over glaciers by short wavelength SAR systems, such as TerraSAR-X, often suffer from a lack of coherence, image features have to be exploited for the shift estimation (feature-tracking). The present paper addresses feature-tracking with special attention to the feasibility requirements and the achievable accuracy of the shift estimation. In particular, the dependence of the performance on image characteristics, such as texture parameters, signal-to-noise ratio (SNR) and resolution, as well as on processing techniques (despeckling, normalised cross-correlation versus maximum likelihood estimation) is analysed by means of Monte-Carlo simulations. TerraSAR-X data acquired over the Helheim glacier, Greenland, and the Aletsch glacier, Switzerland, have been processed to validate the simulation results. Feature-tracking can benefit of the availability of fully-polarimetric data. As some image characteristics, in fact, are polarisation-dependent, the selection of an optimum polarisation leads to improved performance. Furthermore, fully-polarimetric SAR images can be despeckled without degrading the resolution, so that additional (smaller-scale) features can be exploited.

Dokumentart:Konferenzbeitrag (Poster)
Titel:Differential shift estimation in the absence of coherence: performance analysis and benefits of polarimetry
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Villano, MichelangeloNICHT SPEZIFIZIERT
Papathanassiou, Konstantinos P.NICHT SPEZIFIZIERT
Datum:März 2011
Erschienen in:Proceedings of ESA POLinSAR Workshop
Referierte Publikation:Ja
In ISI Web of Science:Nein
Verlag:ESA Communications
Status:veröffentlicht
Stichwörter:differential shift estimation, feature-tracking, glacier monitoring
Veranstaltungstitel:ESA POLinSAR Workshop
Veranstaltungsort:Frascati, Italy
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2011-01-24 - 2011-01-28
Veranstalter :European Space Agency (ESA)
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Tandem-L Vorstudien (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Hochfrequenztechnik und Radarsysteme > Radarkonzepte
Hinterlegt von: Michelangelo Villano
Hinterlegt am:21 Apr 2011 09:48
Letzte Änderung:08 Mai 2014 23:28

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